From owner-fitsbits at kochab.cv.nrao.edu Tue Nov 3 10:44:40 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id KAA25200 for fitsbits-spinner; Tue, 3 Nov 1998 10:43:26 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id KAA25195 for ; Tue, 3 Nov 1998 10:43:19 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id KAA06498 for fitsbits at majordomo.cv.nrao.edu; Tue, 3 Nov 1998 10:43:18 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id NAA12402 for ; Mon, 2 Nov 1998 13:30:16 -0500 (EST) Received: from newsfeed.cv.nrao.edu (newsfeed.cv.nrao.edu [192.33.115.17]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id NAA03954 for ; Mon, 2 Nov 1998 13:30:15 -0500 Received: (from news at localhost) by newsfeed.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id NAA31537; Mon, 2 Nov 1998 13:29:08 -0500 To: fitsbits at fits.cv.nrao.edu Date: Mon, 2 Nov 1998 17:57:59 GMT From: gsh at tantalus.clark.net (Greg Hennessy) Message-ID: Organization: Grey Cat Central Path: newsfeed.cv.nrao.edu!newsgate.duke.edu!newsfeed.berkeley.edu!newsfeed.cwix.com!207.97.14.174!europa.clark.net!206.55.3.15!news.clark.net!not-for-mail Subject: WCS question Newsgroups: sci.astro.fits Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk I am working on producing a set of images on CDROM that will have astrometry according to the Greisen and Calabretta A&A 1996 paper, but the four allowed values for RADECSYS are two for FK4, one FK5, and one geocentric apparent place. The images I will be working on are reduced against the ACT catalog. Are there any conventions to what RADECSYS should be for this? I would assume 'HIP' but would like some advice. From owner-fitsbits at kochab.cv.nrao.edu Tue Nov 3 10:47:38 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id KAA25222 for fitsbits-spinner; Tue, 3 Nov 1998 10:47:37 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id KAA25217 for ; Tue, 3 Nov 1998 10:47:34 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id KAA06522 for fitsbits at majordomo.cv.nrao.edu; Tue, 3 Nov 1998 10:47:33 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id LAA05246 for ; Fri, 30 Oct 1998 11:35:22 -0500 (EST) Received: from newsfeed.cv.nrao.edu (newsfeed.cv.nrao.edu [192.33.115.17]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id LAA26674 for ; Fri, 30 Oct 1998 11:35:21 -0500 Received: (from news at localhost) by newsfeed.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id LAA29881; Fri, 30 Oct 1998 11:34:20 -0500 To: fitsbits at fits.cv.nrao.edu Date: 30 Oct 1998 16:25:38 GMT From: valdes at tucana.tuc.noao.edu (Frank Valdes) Message-ID: <71cpa2$i9g$1 at noao.tuc.noao.edu> Organization: IRAF Project, National Optical Astronomy Observatories Path: newsfeed.cv.nrao.edu!newsgate.duke.edu!newsfeed.berkeley.edu!newsfeed.cwix.com!192.52.106.6!ncar!noao!not-for-mail References: <199810292230.OAA05573 at shatner> Subject: Re: A question on keywords for 3-D images Newsgroups: sci.astro.fits Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk Hello Bob, Of your two options, 3D image with indexed keywords and image extensions, the latter is the one to use. Indexed keywords are a hassle and there is no standard way to do this. You would be unlikely to find software which used this. Multiextension FITS is actually quite commonly used in applications such as yours. Examples of this are the NOAO CCD Mosaic format (8 CCDs recorded in a file with 8 image extensions) and NICMOS/STIS. Because this is a very useful format it is well supported in IRAF. Any IRAF task that operates on a 2D image can access any of the extensions with a simple syntax; for example cl> display sirtif01[im7] would access the extension with EXTNAME of "im7". The syntax also allows a positional selection such as sirtif01[3] to get the third extension in the file. The important advantage regard keywords is that if a program understands a particular set of keywords, such as SIGMA, then it will work with any extension and you don't need all the indexing stuff. Another aspect of the multiextension format, adopted as a convention by HST and NOAO, is the use of a global header. The primary FITS unit consists only of keywords. These keywords are common to all the image extensions in the file. Thus the image extension headers can contain just the keywords which are different. The IRAF software supports this concept of keyword inheritance. Any task that access an image extension, as in the above example, sees a single header which is the merger of the global keywords and the separate extension keywords. It does not need to know about the inheritance and two headers as this is taken care of by the I/O routines. So the summary is use multiextension FITS, possibly with the inheritance convention, which is a solution adopted by a number of projects and is well supported at least in IRAF. Cheers, Frank Valdes NOAO/IRAF Group From owner-fitsbits at kochab.cv.nrao.edu Tue Nov 3 10:49:11 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id KAA25242 for fitsbits-spinner; Tue, 3 Nov 1998 10:49:10 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id KAA25237 for ; Tue, 3 Nov 1998 10:49:06 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id KAA06535 for fitsbits at majordomo.cv.nrao.edu; Tue, 3 Nov 1998 10:49:06 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id NAA05435 for ; Fri, 30 Oct 1998 13:06:12 -0500 (EST) Received: from newsfeed.cv.nrao.edu (newsfeed.cv.nrao.edu [192.33.115.17]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id NAA26967 for ; Fri, 30 Oct 1998 13:06:11 -0500 Received: (from news at localhost) by newsfeed.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id NAA00112; Fri, 30 Oct 1998 13:05:10 -0500 To: fitsbits at fits.cv.nrao.edu Date: 30 Oct 1998 17:37:56 GMT From: hodge at bowline.stsci.edu (Phil Hodge) Message-ID: <71cthk$hpg$1 at tomm.stsci.edu> Organization: Space Telescope Science Institute Path: newsfeed.cv.nrao.edu!newsgate.duke.edu!nntp-out.monmouth.com!newspeer.monmouth.com!newsfeed.enteract.com!newsfeed.berkeley.edu!CS.Arizona.EDU!math.arizona.edu!noao!stsci.edu!not-for-mail References: <199810292230.OAA05573 at shatner> Subject: Re: A question on keywords for 3-D images Newsgroups: sci.astro.fits Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk > Each extension would contain a 2D image and its own set of > keywords. Going to this form loses the 3-D nature of the data with > each 2-D image looking like an independent image rather than being > part of a 3-D cube. Also, there is a concern is that many FITS > readers and standard software may not be able to deal with files in > this form. It may not be supported well in IRAF, CFITSIO, etc. for > 3-D operations. Yes, you would lose the 3-D nature of the data by using either rows or columns of 2-D table entries or multiple 2-D image extensions. Phil From owner-fitsbits at kochab.cv.nrao.edu Tue Nov 3 10:51:52 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id KAA25284 for fitsbits-spinner; Tue, 3 Nov 1998 10:51:51 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id KAA25278 for ; Tue, 3 Nov 1998 10:51:48 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id KAA06571 for fitsbits at majordomo.cv.nrao.edu; Tue, 3 Nov 1998 10:51:47 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id VAA29382 for ; Sun, 1 Nov 1998 21:00:26 -0500 (EST) Received: from newsfeed.cv.nrao.edu (newsfeed.cv.nrao.edu [192.33.115.17]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id VAA02025 for ; Sun, 1 Nov 1998 21:00:24 -0500 Received: (from news at localhost) by newsfeed.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id UAA19339; Sun, 1 Nov 1998 20:59:17 -0500 To: fitsbits at fits.cv.nrao.edu Date: Mon, 02 Nov 1998 00:18:32 GMT From: dmunro at sfu.ca (Duncan Munro) Message-ID: <363cf8c8.12998934 at newsserver.sfu.ca> Organization: Simon Fraser University Path: newsfeed.cv.nrao.edu!newsgate.duke.edu!zombie.ncsc.mil!arlnews!nrlssc.navy.mil!gulfsouth.verio.net!newsfeed.direct.ca!cyclone.bc.net!news.sfu.ca!not-for-mail Subject: Xfitsview port to Xfree86-OS/2 Newsgroups: sci.astro.amateur,sci.astro.fits,sci.astro,comp.os.os2.misc,comp.os.os2.apps Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk I have ported Xfitsview to OS/2. It requires Xfree86-OS/2. The archive is named Xfitsvew.zip and is currently in (ftp or http) hobbes.nmsu.edu/incoming with a proposed placement in hobbes.nmsu.edu/pub/os2/apps/astro Xfitsview is a fits file viewer with astrometry capabilties. For more info on Xfitsview see: http://www.cv.nrao.edu/~bcotton/fitsview.html Duncan Munro From owner-fitsbits at kochab.cv.nrao.edu Tue Nov 3 10:54:48 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id KAA25314 for fitsbits-spinner; Tue, 3 Nov 1998 10:54:46 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id KAA25308 for ; Tue, 3 Nov 1998 10:54:43 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id KAA06591 for fitsbits at majordomo.cv.nrao.edu; Tue, 3 Nov 1998 10:54:43 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id JAA08473 for ; Mon, 2 Nov 1998 09:28:53 -0500 (EST) Received: from newsfeed.cv.nrao.edu (newsfeed.cv.nrao.edu [192.33.115.17]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id JAA03422 for ; Mon, 2 Nov 1998 09:28:52 -0500 Received: (from news at localhost) by newsfeed.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id JAA17593; Mon, 2 Nov 1998 09:27:45 -0500 To: fitsbits at fits.cv.nrao.edu Date: Mon, 02 Nov 1998 12:49:02 +0000 From: Pere L Palle Message-ID: <363DAA3E.F532513B at ll.iac.es> Organization: Instituto de Astrofisica de Canarias Path: newsfeed.cv.nrao.edu!newsgate.duke.edu!news.ysu.edu!news-feed.inet.tele.dk!bofh.vszbr.cz!nntprelay.mathworks.com!news-ge.switch.ch!news.rediris.es!news.ll.iac.es!fula.ll.iac.es Subject: reading fits from MATLAB Newsgroups: sci.astro.fits Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk --------------93D98F05B86066A7E3DF4E06 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Hi colleagues, I have just joined this newsgroup because of an urgent problem !!! I need to read "fits" data files from inside Matlab 5.2. I had some old codes, but does seem to work properly... Does any one know about the xsitence of Matlab routines to read fits data files (no images, but data). Thanks in advance Pere -- --------------------------------------------------------------------------- # Pere L. Palle E-mail: plp at ll.iac.es # # Instituto de Astrofisica de Canarias ppalle at solar.stanford.edu # # 38205 LA LAGUNA (Tenerife) Phone: (34) 922 605384 # # SPAIN Fax: (34) 922 605210 # --------------------------------------------------------------------------- --------------93D98F05B86066A7E3DF4E06 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit
Hi colleagues,
I have just joined this newsgroup because of an urgent problem !!!
I need to read "fits" data files from inside Matlab 5.2.
I had some old codes, but does seem to work properly...


Does any one know about the xsitence of Matlab routines to read fits
data files (no images, but data).
    Thanks in advance
        Pere
-- 
---------------------------------------------------------------------------
#  Pere L. Palle                        E-mail: plp at ll.iac.es             #     
#  Instituto de Astrofisica de Canarias         ppalle at solar.stanford.edu #
#  38205 LA LAGUNA (Tenerife)           Phone:  (34) 922 605384           #
#  SPAIN                                Fax:    (34) 922 605210           #
---------------------------------------------------------------------------
  --------------93D98F05B86066A7E3DF4E06-- From owner-fitsbits at kochab.cv.nrao.edu Fri Nov 6 16:53:22 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id QAA22001 for fitsbits-spinner; Fri, 6 Nov 1998 16:52:36 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id QAA21996 for ; Fri, 6 Nov 1998 16:52:33 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id QAA15793 for fitsbits at majordomo.cv.nrao.edu; Fri, 6 Nov 1998 16:52:32 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id KAA01229 for ; Thu, 5 Nov 1998 10:10:37 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id KAA12127 for ; Thu, 5 Nov 1998 10:11:30 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id KAA11118 for ; Thu, 5 Nov 1998 10:11:28 -0500 Received: from head-cfa.harvard.edu(131.142.41.8) by palantir.cv.nrao.edu via smap (V1.3) id sma011112; Thu Nov 5 10:11:12 1998 Received: from xebec.harvard.edu (xebec [131.142.52.100]) by head-cfa.harvard.edu (8.9.1a/8.9.0) with ESMTP id KAA03990; Thu, 5 Nov 1998 10:04:28 -0500 (EST) From: Arnold Rots Received: (from arots at localhost) by xebec.harvard.edu (8.9.1/8.9.0) id KAA16102; Thu, 5 Nov 1998 10:04:27 -0500 (EST) Message-Id: <199811051504.KAA16102 at xebec.harvard.edu> Subject: Re: WCS question In-Reply-To: from Greg Hennessy at "Nov 2, 98 05:57:59 pm" To: gsh at tantalus.clark.net (Greg Hennessy) Date: Thu, 5 Nov 1998 10:04:27 -0500 (EST) Cc: fitsbits at fits.cv.nrao.edu X-Mailer: ELM [version 2.4ME+ PL28 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk The logical next value for RADECSYS is "ICRS". That is what we will be using for AXAF. - Arnold Rots Greg Hennessy wrote: > > I am working on producing a set of images on CDROM that will have > astrometry according to the Greisen and Calabretta A&A 1996 paper, but > the four allowed values for RADECSYS are two for FK4, one FK5, and one > geocentric apparent place. The images I will be working on are > reduced against the ACT catalog. Are there any conventions to what > RADECSYS should be for this? I would assume 'HIP' but would like some > advice. -------------------------------------------------------------------------- Arnold H. Rots AXAF Science Center Smithsonian Astrophysical Observatory tel: +1 617 496 7701 60 Garden Street, MS 81 fax: +1 617 495 7356 Cambridge, MA 02138 arots at head-cfa.harvard.edu USA http://hea-www.harvard.edu/~arots/ -------------------------------------------------------------------------- From owner-fitsbits at kochab.cv.nrao.edu Fri Nov 6 16:53:30 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id QAA22015 for fitsbits-spinner; Fri, 6 Nov 1998 16:53:29 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id QAA22010 for ; Fri, 6 Nov 1998 16:53:26 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id QAA15799 for fitsbits at majordomo.cv.nrao.edu; Fri, 6 Nov 1998 16:53:25 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id KAA01264 for ; Thu, 5 Nov 1998 10:21:04 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id KAA12149 for ; Thu, 5 Nov 1998 10:22:06 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id KAA11244 for ; Thu, 5 Nov 1998 10:22:04 -0500 Received: from head-cfa.harvard.edu(131.142.41.8) by palantir.cv.nrao.edu via smap (V1.3) id sma011222; Thu Nov 5 10:21:36 1998 Received: from xebec.harvard.edu (xebec [131.142.52.100]) by head-cfa.harvard.edu (8.9.1a/8.9.0) with ESMTP id KAA04610; Thu, 5 Nov 1998 10:14:52 -0500 (EST) From: Arnold Rots Received: (from arots at localhost) by xebec.harvard.edu (8.9.1/8.9.0) id KAA16110; Thu, 5 Nov 1998 10:14:51 -0500 (EST) Message-Id: <199811051514.KAA16110 at xebec.harvard.edu> Subject: Re: A question on keywords for 3-D images In-Reply-To: <71cpa2$i9g$1 at noao.tuc.noao.edu> from Frank Valdes at "Oct 30, 98 04:25:38 pm" To: valdes at tucana.tuc.noao.edu (Frank Valdes) Date: Thu, 5 Nov 1998 10:14:51 -0500 (EST) Cc: fitsbits at fits.cv.nrao.edu X-Mailer: ELM [version 2.4ME+ PL28 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk I would strongly warn against the use of this convention. If all you want is to use your images in IRAF and if you know others will do the same, in perpetuity, it's fine. But most other systems explicitly assume the opposite: each HDU stands by itself and there is no inheritance. Previous discussions on the subject concluded that the notion of inheritance is not supported by the FITS standard and may not be assumed. - Arnold Rots Frank Valdes wrote: > Hello Bob, > ... > > Another aspect of the multiextension format, adopted as a convention by > HST and NOAO, is the use of a global header. The primary FITS unit consists > only of keywords. These keywords are common to all the image extensions > in the file. Thus the image extension headers can contain just the > keywords which are different. The IRAF software supports this concept > of keyword inheritance. Any task that access an image extension, as in > the above example, sees a single header which is the merger of the global > keywords and the separate extension keywords. It does not need to know > about the inheritance and two headers as this is taken care of by the > I/O routines. > > So the summary is use multiextension FITS, possibly with the inheritance > convention, which is a solution adopted by a number of projects and is > well supported at least in IRAF. > > Cheers, > Frank Valdes > NOAO/IRAF Group -------------------------------------------------------------------------- Arnold H. Rots AXAF Science Center Smithsonian Astrophysical Observatory tel: +1 617 496 7701 60 Garden Street, MS 81 fax: +1 617 495 7356 Cambridge, MA 02138 arots at head-cfa.harvard.edu USA http://hea-www.harvard.edu/~arots/ -------------------------------------------------------------------------- From owner-fitsbits at kochab.cv.nrao.edu Fri Nov 6 16:55:38 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id QAA22041 for fitsbits-spinner; Fri, 6 Nov 1998 16:55:37 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id QAA22036 for ; Fri, 6 Nov 1998 16:55:34 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id QAA15817 for fitsbits at majordomo.cv.nrao.edu; Fri, 6 Nov 1998 16:55:34 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id MAA01721 for ; Thu, 5 Nov 1998 12:10:43 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id MAA12379 for ; Thu, 5 Nov 1998 12:11:46 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id MAA18413 for ; Thu, 5 Nov 1998 12:11:44 -0500 Received: from noao.edu(140.252.1.54) by palantir.cv.nrao.edu via smap (V1.3) id sma018401; Thu Nov 5 12:11:15 1998 Received: from tucana.tuc.noao.edu (tucana.tuc.noao.edu [140.252.1.1]) by noao.edu (8.8.8/8.8.8/SAG-11Jul98) with SMTP id KAA03075; Thu, 5 Nov 1998 10:09:44 -0700 (MST) (envelope-from valdes at tucana.tuc.noao.edu) Received: by tucana.tuc.noao.edu (4.1/SAG.sat.14) id AA21977; Thu, 5 Nov 98 10:09:44 MST; for fitsbits at fits.cv.nrao.edu Date: Thu, 5 Nov 98 10:09:44 MST From: valdes at noao.edu (Frank Valdes) Message-Id: <9811051709.AA21977 at tucana.tuc.noao.edu> To: arots at head-cfa.harvard.edu Subject: Re: A question on keywords for 3-D images Cc: fitsbits at fits.cv.nrao.edu Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk Hello Arnold, I appreciate your concern. However, the usage of this is larger than you may think. The inheritance approach began, I believe, with the needs at HST for the new instruments (NICMOS/STIS). Years of software development has gone into this and it has been discussed and status papers have been presented at ADASS for many years. The IRAF FITS kernel support for inheritance began at ST. I expect HST to continue to use this approach. NOAO adopted this because it made sense for mosaic instruments but it is a smaller effort. One thing I did not say in my posting is that for the NOAO Mosaic the header design is such that critical keywords are included in all extensions even though they are the same in all extensions. For example, exposure time appears in all extensions. Thus any software which may not merge the global keywords will still have a useful minimal header for interpreting the data. I purposely phrased my comment that this was a "convention" since, as you say, it is not a FITS standard. However the idea of conventions is a known practice in the community. There is no "assumption" that this is supported by all FITS readers (though all readers should be able to ingest both the primary (global) and extension headers. For the specific formats, NICMOS, STIS, NOAO/MOSAIC, other similar mosaics, people will be advised of the format. It is not very hard to merge headers if needed. Frank Valdes My role in this has been in the design of the NOAO Mosaic format and I had little to do with the development of the convention. > From arots at head-cfa.harvard.edu Thu Nov 5 08:25:03 1998 > > I would strongly warn against the use of this convention. If all you > want is to use your images in IRAF and if you know others will do the > same, in perpetuity, it's fine. But most other systems explicitly > assume the opposite: each HDU stands by itself and there is no > inheritance. Previous discussions on the subject concluded that the > notion of inheritance is not supported by the FITS standard and may > not be assumed. > > - Arnold Rots From owner-fitsbits at kochab.cv.nrao.edu Fri Nov 6 16:57:54 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id QAA22069 for fitsbits-spinner; Fri, 6 Nov 1998 16:57:53 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id QAA22064 for ; Fri, 6 Nov 1998 16:57:50 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id QAA15828 for fitsbits at majordomo.cv.nrao.edu; Fri, 6 Nov 1998 16:57:49 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id MAA01842 for ; Thu, 5 Nov 1998 12:43:50 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id MAA12440 for ; Thu, 5 Nov 1998 12:43:50 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id MAA19045 for ; Thu, 5 Nov 1998 12:43:48 -0500 Received: from head-cfa.harvard.edu(131.142.41.8) by palantir.cv.nrao.edu via smap (V1.3) id sma019042; Thu Nov 5 12:43:45 1998 Received: from xebec.harvard.edu (xebec [131.142.52.100]) by head-cfa.harvard.edu (8.9.1a/8.9.0) with ESMTP id MAA12107; Thu, 5 Nov 1998 12:37:01 -0500 (EST) From: Arnold Rots Received: (from arots at localhost) by xebec.harvard.edu (8.9.1/8.9.0) id MAA16708; Thu, 5 Nov 1998 12:37:00 -0500 (EST) Message-Id: <199811051737.MAA16708 at xebec.harvard.edu> Subject: Re: A question on keywords for 3-D images In-Reply-To: <9811051709.AA21977 at tucana.tuc.noao.edu> from Frank Valdes at "Nov 5, 98 10:09:44 am" To: valdes at noao.edu (Frank Valdes) Date: Thu, 5 Nov 1998 12:37:00 -0500 (EST) Cc: fitsbits at fits.cv.nrao.edu X-Mailer: ELM [version 2.4ME+ PL28 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk I agree that adopting the convention in the context of HST is reasonably safe, but would argue that its adoption outside that context is dangerous. I certainly appreciated your use of the word "convention", but although most conventions are fairly harmless if not understood, this one can bite the unwary user: software will either support this convention or its opposite - there is no "neutral" position. Hence, the safe thing is not to assume inheritance and repeat all relevant keywords in all headers. - Arnold Frank Valdes wrote: > Hello Arnold, > > I appreciate your concern. However, the usage of this is larger than you > may think. The inheritance approach began, I believe, with the needs at > HST for the new instruments (NICMOS/STIS). Years of software development > has gone into this and it has been discussed and status papers have been > presented at ADASS for many years. The IRAF FITS kernel support for > inheritance began at ST. I expect HST to continue to use this > approach. NOAO adopted this because it made sense for mosaic instruments > but it is a smaller effort. One thing I did not say in my posting is that > for the NOAO Mosaic the header design is such that critical keywords are > included in all extensions even though they are the same in all extensions. > For example, exposure time appears in all extensions. Thus any software > which may not merge the global keywords will still have a useful minimal > header for interpreting the data. > > I purposely phrased my comment that this was a "convention" since, as > you say, it is not a FITS standard. However the idea of conventions is > a known practice in the community. There is no "assumption" that this > is supported by all FITS readers (though all readers should be able to > ingest both the primary (global) and extension headers. For the > specific formats, NICMOS, STIS, NOAO/MOSAIC, other similar mosaics, > people will be advised of the format. It is not very hard to merge > headers if needed. > > Frank Valdes > > My role in this has been in the design of the NOAO Mosaic format and I had > little to do with the development of the convention. > > > From arots at head-cfa.harvard.edu Thu Nov 5 08:25:03 1998 > > > > I would strongly warn against the use of this convention. If all you > > want is to use your images in IRAF and if you know others will do the > > same, in perpetuity, it's fine. But most other systems explicitly > > assume the opposite: each HDU stands by itself and there is no > > inheritance. Previous discussions on the subject concluded that the > > notion of inheritance is not supported by the FITS standard and may > > not be assumed. > > > > - Arnold Rots -------------------------------------------------------------------------- Arnold H. Rots AXAF Science Center Smithsonian Astrophysical Observatory tel: +1 617 496 7701 60 Garden Street, MS 81 fax: +1 617 495 7356 Cambridge, MA 02138 arots at head-cfa.harvard.edu USA http://hea-www.harvard.edu/~arots/ -------------------------------------------------------------------------- From owner-fitsbits at kochab.cv.nrao.edu Fri Nov 6 16:59:37 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id QAA22093 for fitsbits-spinner; Fri, 6 Nov 1998 16:59:36 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id QAA22088 for ; Fri, 6 Nov 1998 16:59:33 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id QAA15837 for fitsbits at majordomo.cv.nrao.edu; Fri, 6 Nov 1998 16:59:32 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id KAA14076 for ; Fri, 6 Nov 1998 10:27:55 -0500 (EST) Received: from newsfeed.cv.nrao.edu (newsfeed.cv.nrao.edu [192.33.115.17]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id KAA14963 for ; Fri, 6 Nov 1998 10:27:55 -0500 Received: (from news at localhost) by newsfeed.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id KAA06772; Fri, 6 Nov 1998 10:26:40 -0500 To: fitsbits at fits.cv.nrao.edu Date: Thu, 05 Nov 1998 14:51:11 -0500 From: Doug Mink Message-ID: <364201AF.1ABA8298 at cfa.harvard.edu> Organization: Harvard University Path: newsfeed.cv.nrao.edu!newsgate.duke.edu!newsfeed.berkeley.edu!newsxfer3.itd.umich.edu!news.eecs.umich.edu!news.bu.edu!purdue!mufasa.harvard.edu!cfanews.harvard.edu!131.142.10.153 References: Subject: Re: WCS question Newsgroups: sci.astro.fits Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk Greg Hennessy wrote: > > I am working on producing a set of images on CDROM that will have > astrometry according to the Greisen and Calabretta A&A 1996 paper, but > the four allowed values for RADECSYS are two for FK4, one FK5, and one > geocentric apparent place. The images I will be working on are > reduced against the ACT catalog. Are there any conventions to what > RADECSYS should be for this? I would assume 'HIP' but would like some > advice. We talked about this at ADASS, and there was some agreement that the RADECSYS for Tycho- and ACT- (and Hipparcos-) based images could be HIPPARCOS (spelled out). Pat Wallace has subroutines which convert between the Hipparcos system and J2000, and I will be adding them to my WCSTools package as soon as I get them from him. -Doug Mink WCSTools developer ( http://tdc-www.harvard.edu/software/wcstools/ ) From owner-fitsbits at kochab.cv.nrao.edu Mon Nov 9 10:02:28 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id KAA08405 for fitsbits-spinner; Mon, 9 Nov 1998 10:01:47 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id KAA08400 for ; Mon, 9 Nov 1998 10:01:43 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id KAA23685 for fitsbits at majordomo.cv.nrao.edu; Mon, 9 Nov 1998 10:01:43 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id JAA08336 for ; Mon, 9 Nov 1998 09:48:55 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id JAA23650 for ; Mon, 9 Nov 1998 09:48:55 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id JAA12415 for ; Mon, 9 Nov 1998 09:48:54 -0500 Received: from head-cfa.harvard.edu(131.142.41.8) by palantir.cv.nrao.edu via smap (V1.3) id sma012409; Mon Nov 9 09:48:48 1998 Received: from xebec.harvard.edu (xebec [131.142.52.100]) by head-cfa.harvard.edu (8.9.1a/8.9.0) with ESMTP id JAA27717; Mon, 9 Nov 1998 09:42:04 -0500 (EST) From: Arnold Rots Received: (from arots at localhost) by xebec.harvard.edu (8.9.1/8.9.0) id JAA01019; Mon, 9 Nov 1998 09:42:03 -0500 (EST) Message-Id: <199811091442.JAA01019 at xebec.harvard.edu> Subject: Re: WCS question In-Reply-To: <364201AF.1ABA8298 at cfa.harvard.edu> from Doug Mink at "Nov 5, 98 02:51:11 pm" To: dmink at cfa.harvard.edu (Doug Mink) Date: Mon, 9 Nov 1998 09:42:03 -0500 (EST) Cc: fitsbits at fits.cv.nrao.edu X-Mailer: ELM [version 2.4ME+ PL28 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk Doug Mink wrote: > Greg Hennessy wrote: > > > > I am working on producing a set of images on CDROM that will have > > astrometry according to the Greisen and Calabretta A&A 1996 paper, but > > the four allowed values for RADECSYS are two for FK4, one FK5, and one > > geocentric apparent place. The images I will be working on are > > reduced against the ACT catalog. Are there any conventions to what > > RADECSYS should be for this? I would assume 'HIP' but would like some > > advice. > > We talked about this at ADASS, and there was some agreement that the > RADECSYS for Tycho- and ACT- (and Hipparcos-) based images could be > HIPPARCOS (spelled out). Pat Wallace has subroutines which convert > between the Hipparcos system and J2000, and I will be adding them > to my WCSTools package as soon as I get them from him. > > -Doug Mink > WCSTools developer ( http://tdc-www.harvard.edu/software/wcstools/ ) Be careful! There are three elements to the definition of a reference frame: the epoch (2000), J or B, and the reference frame itself (FK5, ICRS). FK4 is the one commonly used with B1950. Its J-equivalent FK5 has sofar been used with J2000. However, "J2000" does not imply FK5 (as you imply above). Instead, the IAU recommendation is to move from J2000-FK5 to J2000-ICRS. ICRS, based on Hipparcos and Tycho data, is the official designation of the reference system and, hence, would seem the logical choice for RADECSYS. A similar issue comes up in the transformation from DE200 to DE405. That transformation is close to FK5 -> ICRS. Just for reference, this is the comment section for the function that does that conversion: * c200to405 converts a direction cosine vector from the DE200 frame * (nominally FK5, but not quite) to the DE405 frame (ICRS). * * double dir[3] direction cosine vector (in and out) * * The formula, according to Standish, is: * * dir(DE405) = dir(DE200) + eps x dir(DE200) * * where eps = (0.002, 0.012, 0.006) / 206265 - Arnold Rots -------------------------------------------------------------------------- Arnold H. Rots AXAF Science Center Smithsonian Astrophysical Observatory tel: +1 617 496 7701 60 Garden Street, MS 81 fax: +1 617 495 7356 Cambridge, MA 02138 arots at head-cfa.harvard.edu USA http://hea-www.harvard.edu/~arots/ -------------------------------------------------------------------------- From owner-fitsbits at kochab.cv.nrao.edu Mon Nov 9 16:23:35 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id QAA20553 for fitsbits-spinner; Mon, 9 Nov 1998 16:23:21 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id QAA20547 for ; Mon, 9 Nov 1998 16:23:18 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id QAA25041 for fitsbits at majordomo.cv.nrao.edu; Mon, 9 Nov 1998 16:23:17 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id PAA19796 for ; Mon, 9 Nov 1998 15:34:34 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id PAA24878 for ; Mon, 9 Nov 1998 15:34:33 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id PAA01582 for ; Mon, 9 Nov 1998 15:34:32 -0500 Received: from star.rl.ac.uk(130.246.36.1) by palantir.cv.nrao.edu via smap (V1.3) id sma001579; Mon Nov 9 15:34:28 1998 Received: from rlsaxps.bnsc.rl.ac.uk (ptw at rlsaxps.bnsc.rl.ac.uk [130.246.32.128]) by star.rl.ac.uk (8.8.7/8.8.7) with ESMTP id UAA30608; Mon, 9 Nov 1998 20:31:55 GMT Received: from localhost (ptw at localhost) by rlsaxps.bnsc.rl.ac.uk (8.9.1/8.9.1) with SMTP id UAA26947; Mon, 9 Nov 1998 20:31:54 GMT X-Authentication-Warning: rlsaxps.bnsc.rl.ac.uk: ptw owned process doing -bs Date: Mon, 9 Nov 1998 20:31:54 +0000 (GMT) From: Patrick Wallace X-Sender: ptw at rlsaxps.bnsc.rl.ac.uk To: Arnold Rots cc: Doug Mink , fitsbits at fits.cv.nrao.edu Subject: Re: WCS question In-Reply-To: <199811091442.JAA01019 at xebec.harvard.edu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk On Mon, 9 Nov 1998, Arnold Rots wrote: > Be careful! There are three elements to the definition of a reference > frame: the epoch (2000), J or B, and the reference frame itself (FK5, > ICRS). No longer true for ICRF. > However, "J2000" does not imply FK5 (as you imply above). Maybe not, strictly speaking, but in practice "J2000" is always taken to mean "in accordance with the IAU 1976 recommendations", which, as well as introducing J2000 as the fundamental epoch, brought in a specific precession model (Lieske's) and frame (FK5). > Instead, the IAU recommendation is to move from J2000-FK5 to J2000-ICRS. The J2000 is superfluous in the case of ICRS. You only need epochs when the system depends on a model of precession. ICRS has no ecliptic or equinox. It is fixed for all time in the extragalactic background, liberated from considerations of the Earth's orientation or orbit. If you wrote J2050-ICRS it wouldn't mean anything. Patrick Wallace ____________________________________________________________________________ Starlink Project Manager Internet: ptw at star.rl.ac.uk Rutherford Appleton Laboratory Tel: +44-1235-445372 Chilton, Didcot, Oxon OX11 0QX, UK Fax: +44-1235-446667 ____________________________________________________________________________ From owner-fitsbits at kochab.cv.nrao.edu Mon Nov 9 16:23:48 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id QAA20567 for fitsbits-spinner; Mon, 9 Nov 1998 16:23:46 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id QAA20561 for ; Mon, 9 Nov 1998 16:23:43 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id QAA25048 for fitsbits at majordomo.cv.nrao.edu; Mon, 9 Nov 1998 16:23:43 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id QAA20487 for ; Mon, 9 Nov 1998 16:13:49 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id QAA25004 for ; Mon, 9 Nov 1998 16:13:49 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id QAA02039 for ; Mon, 9 Nov 1998 16:13:47 -0500 Received: from head-cfa.harvard.edu(131.142.41.8) by palantir.cv.nrao.edu via smap (V1.3) id sma002036; Mon Nov 9 16:13:46 1998 Received: from xebec.harvard.edu (xebec [131.142.52.100]) by head-cfa.harvard.edu (8.9.1a/8.9.0) with ESMTP id QAA15232; Mon, 9 Nov 1998 16:07:02 -0500 (EST) From: Arnold Rots Received: (from arots at localhost) by xebec.harvard.edu (8.9.1/8.9.0) id QAA02440; Mon, 9 Nov 1998 16:07:01 -0500 (EST) Message-Id: <199811092107.QAA02440 at xebec.harvard.edu> Subject: Re: WCS question In-Reply-To: from Patrick Wallace at "Nov 9, 98 08:31:54 pm" To: ptw at star.rl.ac.uk (Patrick Wallace) Date: Mon, 9 Nov 1998 16:07:01 -0500 (EST) Cc: dmink at cfa.harvard.edu, fitsbits at fits.cv.nrao.edu X-Mailer: ELM [version 2.4ME+ PL28 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk Patrick Wallace wrote: > On Mon, 9 Nov 1998, Arnold Rots wrote: > > > Be careful! There are three elements to the definition of a reference > > frame: the epoch (2000), J or B, and the reference frame itself (FK5, > > ICRS). > > No longer true for ICRF. > > > However, "J2000" does not imply FK5 (as you imply above). > > Maybe not, strictly speaking, but in practice "J2000" is always taken > to mean "in accordance with the IAU 1976 recommendations", which, as > well as introducing J2000 as the fundamental epoch, brought in a > specific precession model (Lieske's) and frame (FK5). > > > Instead, the IAU recommendation is to move from J2000-FK5 to J2000-ICRS. > > The J2000 is superfluous in the case of ICRS. You only need epochs > when the system depends on a model of precession. ICRS has no ecliptic > or equinox. It is fixed for all time in the extragalactic background, > liberated from considerations of the Earth's orientation or orbit. If > you wrote J2050-ICRS it wouldn't mean anything. Yep, I spoke too hastily. However, in practice (for observing), one may want to precess the ICRS position to a different epoch. Doesn't it then become an ICRS position at epoch 1998.85? - Arnold > > > Patrick Wallace > ____________________________________________________________________________ > Starlink Project Manager Internet: ptw at star.rl.ac.uk > Rutherford Appleton Laboratory Tel: +44-1235-445372 > Chilton, Didcot, Oxon OX11 0QX, UK Fax: +44-1235-446667 > ____________________________________________________________________________ > > -------------------------------------------------------------------------- Arnold H. Rots AXAF Science Center Smithsonian Astrophysical Observatory tel: +1 617 496 7701 60 Garden Street, MS 81 fax: +1 617 495 7356 Cambridge, MA 02138 arots at head-cfa.harvard.edu USA http://hea-www.harvard.edu/~arots/ -------------------------------------------------------------------------- From owner-fitsbits at kochab.cv.nrao.edu Mon Nov 9 22:12:30 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id WAA22993 for fitsbits-spinner; Mon, 9 Nov 1998 22:12:20 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id WAA22988 for ; Mon, 9 Nov 1998 22:12:16 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id WAA26009 for fitsbits at majordomo.cv.nrao.edu; Mon, 9 Nov 1998 22:12:16 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id SAA21881 for ; Mon, 9 Nov 1998 18:51:56 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id SAA25532 for ; Mon, 9 Nov 1998 18:51:56 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id SAA04123 for ; Mon, 9 Nov 1998 18:51:55 -0500 Received: from star.rl.ac.uk(130.246.36.1) by palantir.cv.nrao.edu via smap (V1.3) id sma004119; Mon Nov 9 18:51:30 1998 Received: from rlsaxps.bnsc.rl.ac.uk (ptw at rlsaxps.bnsc.rl.ac.uk [130.246.32.128]) by star.rl.ac.uk (8.8.7/8.8.7) with ESMTP id XAA19523; Mon, 9 Nov 1998 23:48:54 GMT Received: from localhost (ptw at localhost) by rlsaxps.bnsc.rl.ac.uk (8.9.1/8.9.1) with SMTP id XAA08923; Mon, 9 Nov 1998 23:48:52 GMT X-Authentication-Warning: rlsaxps.bnsc.rl.ac.uk: ptw owned process doing -bs Date: Mon, 9 Nov 1998 23:48:52 +0000 (GMT) From: Patrick Wallace X-Sender: ptw at rlsaxps.bnsc.rl.ac.uk Reply-To: Patrick Wallace To: Arnold Rots cc: dmink at cfa.harvard.edu, fitsbits at fits.cv.nrao.edu Subject: Re: WCS question In-Reply-To: <199811092107.QAA02440 at xebec.harvard.edu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk On Mon, 9 Nov 1998, Arnold Rots wrote: > ...However, in practice (for observing), one > may want to precess the ICRS position to a different epoch. Doesn't > it then become an ICRS position at epoch 1998.85? Proper motion apart, an "ICRS position at epoch 1998.85" is precisely the same as an ICRS position at any other epoch, because the ICRS-defined axes don't move. There is no such thing as mean place any more. Putting it another way, precession isn't involved until you want to point a telescope. Even then, in the new deal there is never any reason to apply precession alone; only the orientation of the Earth matters, and the artificial separation into secular/long-period terms (precession) and short-period terms (nutation) is avoided except perhaps as a computing convenience. Patrick Wallace ____________________________________________________________________________ Starlink Project Manager Internet: ptw at star.rl.ac.uk Rutherford Appleton Laboratory Tel: +44-1235-445372 Chilton, Didcot, Oxon OX11 0QX, UK Fax: +44-1235-446667 ____________________________________________________________________________ From owner-fitsbits at kochab.cv.nrao.edu Mon Nov 9 22:12:44 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id WAA23006 for fitsbits-spinner; Mon, 9 Nov 1998 22:12:43 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id WAA23001 for ; Mon, 9 Nov 1998 22:12:40 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id WAA26014 for fitsbits at majordomo.cv.nrao.edu; Mon, 9 Nov 1998 22:12:39 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id TAA21915 for ; Mon, 9 Nov 1998 19:09:07 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id TAA25580 for ; Mon, 9 Nov 1998 19:09:07 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id TAA04357 for ; Mon, 9 Nov 1998 19:09:05 -0500 Received: from cfa.harvard.edu(131.142.10.1) by palantir.cv.nrao.edu via smap (V1.3) id sma004349; Mon Nov 9 19:08:53 1998 Received: from xena.harvard.edu (xena.harvard.edu [131.142.10.153]) by cfa.harvard.edu (8.8.5/8.7.3) with ESMTP id TAA17915; Mon, 9 Nov 1998 19:06:17 -0500 (EST) Received: from cfa.harvard.edu (localhost [127.0.0.1]) by xena.harvard.edu (8.8.8+Sun/8.8.8) with ESMTP id TAA24778; Mon, 9 Nov 1998 19:06:13 -0500 (EST) Message-ID: <36478374.CB417A4E at cfa.harvard.edu> Date: Mon, 09 Nov 1998 19:06:12 -0500 From: Doug Mink X-Mailer: Mozilla 4.5b2 [en] (X11; I; SunOS 5.5.1 sun4m) X-Accept-Language: en MIME-Version: 1.0 To: Patrick Wallace CC: Arnold Rots , fitsbits at fits.cv.nrao.edu Subject: Re: WCS question References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk Patrick Wallace wrote: > > Putting it another way, precession isn't involved until you want to > point a telescope. Even then, in the new deal there is never any reason > to apply precession alone; only the orientation of the Earth matters, and > the artificial separation into secular/long-period terms (precession) and > short-period terms (nutation) is avoided except perhaps as a computing > convenience. So if all we want to know is the position of an object in the image in the coordinate system of the reference stars, the only reasons to worry about the date of the observation are proper motion and conversion to another, time-dependent coordinate system, such as FK4 or FK5? -Doug From owner-fitsbits at kochab.cv.nrao.edu Mon Nov 9 22:13:27 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id WAA23026 for fitsbits-spinner; Mon, 9 Nov 1998 22:13:26 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id WAA23021 for ; Mon, 9 Nov 1998 22:13:23 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id WAA26035 for fitsbits at majordomo.cv.nrao.edu; Mon, 9 Nov 1998 22:13:22 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id TAA22322 for ; Mon, 9 Nov 1998 19:21:46 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id TAA25613 for ; Mon, 9 Nov 1998 19:21:45 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id TAA04521 for ; Mon, 9 Nov 1998 19:21:44 -0500 Received: from star.rl.ac.uk(130.246.36.1) by palantir.cv.nrao.edu via smap (V1.3) id sma004517; Mon Nov 9 19:21:43 1998 Received: from rlsaxps.bnsc.rl.ac.uk (ptw at rlsaxps.bnsc.rl.ac.uk [130.246.32.128]) by star.rl.ac.uk (8.8.7/8.8.7) with ESMTP id AAA30736; Tue, 10 Nov 1998 00:19:12 GMT Received: from localhost (ptw at localhost) by rlsaxps.bnsc.rl.ac.uk (8.9.1/8.9.1) with SMTP id AAA02066; Tue, 10 Nov 1998 00:19:12 GMT X-Authentication-Warning: rlsaxps.bnsc.rl.ac.uk: ptw owned process doing -bs Date: Tue, 10 Nov 1998 00:19:12 +0000 (GMT) From: Patrick Wallace X-Sender: ptw at rlsaxps.bnsc.rl.ac.uk To: Doug Mink cc: Arnold Rots , fitsbits at fits.cv.nrao.edu Subject: Re: WCS question In-Reply-To: <36478374.CB417A4E at cfa.harvard.edu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk On Mon, 9 Nov 1998, Doug Mink wrote: > So if all we want to know is the position of an object in the image in > the coordinate system of the reference stars, the only reasons to worry > about the date of the observation are proper motion and conversion to > another, time-dependent coordinate system, such as FK4 or FK5? Affirmative. Patrick Wallace ____________________________________________________________________________ Starlink Project Manager Internet: ptw at star.rl.ac.uk Rutherford Appleton Laboratory Tel: +44-1235-445372 Chilton, Didcot, Oxon OX11 0QX, UK Fax: +44-1235-446667 ____________________________________________________________________________ From owner-fitsbits at kochab.cv.nrao.edu Tue Nov 10 15:24:39 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id PAA16109 for fitsbits-spinner; Tue, 10 Nov 1998 15:23:55 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id PAA16098 for ; Tue, 10 Nov 1998 15:23:51 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id PAA29452 for fitsbits at majordomo.cv.nrao.edu; Tue, 10 Nov 1998 15:23:51 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id PAA12845 for ; Tue, 10 Nov 1998 15:11:44 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id PAA29421 for ; Tue, 10 Nov 1998 15:11:43 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id PAA24108 for ; Tue, 10 Nov 1998 15:11:41 -0500 Received: from wheelo.gsfc.nasa.gov(128.183.50.20) by palantir.cv.nrao.edu via smap (V1.3) id sma024102; Tue Nov 10 15:11:28 1998 Received: from tetra.gsfc.nasa.gov (tetra.gsfc.nasa.gov [128.183.16.178]) by wheelo.gsfc.nasa.gov (8.8.8/8.8.8) with SMTP id PAA10975 for ; Tue, 10 Nov 1998 15:05:09 -0500 (EST) Received: from tetra.gsfc.nasa.gov by tetra.gsfc.nasa.gov (SMI-8.6/SMI-SVR4) id PAA04678; Tue, 10 Nov 1998 15:05:02 -0500 Message-ID: <36489C6E.A5EB7A2D at tetra.gsfc.nasa.gov> Date: Tue, 10 Nov 1998 15:05:02 -0500 From: William Pence Organization: HEASARC X-Mailer: Mozilla 4.05 [en] (X11; I; SunOS 5.6 sun4u) MIME-Version: 1.0 To: FITSBITS Subject: CFITSIO v2.0 Release Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk . **** CFITSIO v2.0 Release **** The full (not beta) v2.0 version of the CFITSIO library for reading and writing FITS files has been officially released and is available at http://heasarc.gsfc.nasa.gov/fitsio This release is backward compatible with the previous v1.42 release, and contains many major new features, including: 1. CFITSIO can now read IRAF format image files (.imh files) as well as FITS files. Thus, any program that uses CFITSIO to do image analysis of FITS images will be able to directly read IRAF images as well. 2. Any FITS file on the internet can be directly accessed by providing the full FTP or HTTP URL to CFITSIO's open_file routine. 3. Input FITS files can be filtered or modified at run-time based on a user-supplied expression that is appended to the name of the input file. This allows users, at run time, to: a) select a subset of the rows in a table which satisfy an arbitrarily complex boolean expression b) create new table columns whose values are calculated as a function of other columns and/or keywords in the table c) create a virtual FITS image by binning/histogramming the values in one or more table columns. This is most often used to create an image by binning a list of X and Y coordinates for each event in a table. These file filtering routines use new extremely fast, state-of-the-art algorithms. Effective file I/O throughput rates of 5 - 10 MB/s are typical on current generation workstations or PCs. 4. A Fortran-callable interface is provided, so CFITSIO routines may be easily called from Fortran programs as well as from C. 5. The Users Guide has been greatly improved. Acknowledgements: Many people and institutions have contributed to the new features in CFITSIO, including: Jurek Brokowski, Bruce O'Neel, and Don Jennings at the Integral Science Data Center (ISDC), in Switzerland designed the concept of plug-in I/O drivers for CFITSIO 2.0. This greatly simplified the low-level I/O which in turn made other new features such as support for compressed FITS files and IRAF image files much easier to implement. They provided the ftp, http, root, and shared memory file drivers. They are also responsible for providing the template file parsing routines and the hierarchical grouping routines. Uwe Lamers, at XMM/ESA/ESTEC, provided the fast lexical parsing algorithm that is used by CFITSIO to filter table rows at run time. This algorithm in effect compiles the expression, so that it does not need to be reinterpreted for every row of the table. Peter Wilson (RSTX, NASA/GSFC) recoded this parsing algorithm in C and combined it with the CFITSIO iterator function for even faster throughput. He also added support for all the FITS datatypes and null values. The file filtering and binning syntax used by CFITSIO is modelled on a similar syntax developed by Jonathan McDowell and collaborators at the AXAF Science Center. Doug Mink (SAO) provided the routines for converting IRAF format images into FITS format. ____________________________________________________________________ Dr. William Pence pence at tetra.gsfc.nasa.gov NASA/GSFC Code 662 HEASARC +1-301-286-4599 (voice) Greenbelt MD 20771 +1-301-286-1684 (fax) From owner-fitsbits at kochab.cv.nrao.edu Fri Nov 13 16:45:19 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id QAA01660 for fitsbits-spinner; Fri, 13 Nov 1998 16:43:56 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id QAA01655 for ; Fri, 13 Nov 1998 16:43:53 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id QAA05130 for fitsbits at majordomo.cv.nrao.edu; Fri, 13 Nov 1998 16:43:53 -0500 Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id QAA01603 for ; Fri, 13 Nov 1998 16:36:50 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id QAA05091; Fri, 13 Nov 1998 16:36:29 -0500 Date: Fri, 13 Nov 1998 16:36:29 -0500 Message-Id: <199811132136.QAA05091 at fits.cv.nrao.edu> From: Don Wells MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit To: fitsbits at fits.cv.nrao.edu Subject: ADASS-FITS-BoF annual report (WCS negotiations) X-Mailer: VM 6.35 under Emacs 20.2.1 Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk ADASS-FITS-BoF annual report (WCS negotiations) Don Wells [Chair, IAU FITS Working Group] 1998-11-13 In recent years the FITS BoF [Birds-of-a-Feather] sessions at ADASS meetings have been the primary annual face-to-face meeting for the FITS community, and the agenda of each BoF has acted as an annual report for FITS. I have prepared this memo as a written version of the three viewgraphs which I used at the ADASS'98 FITS BoF, held at Univ. of Illinois late in the afternoon of Monday November 2nd. There were 30-40 people present in the room. 1. The NASA NOST FITS Standard A technical panel under the leadership of Bob Hanisch has been working on this codification of all FITS Agreements through the end of 1997. A draft version was submitted to the community for review in the spring of 1998, and 140 comments were received from the worldwide FITS community. The technical panel has considered each of these comments, and has decided on responses to them. Bob Hanisch was not able to attend ADASS'98, so the secretary of the panel, Bill Pence, read Hanisch's report to the BoF. The panel expects to send out the responses soon, and to have a new version of the Standard ready for review within a few months, perhaps within a few weeks. The ultimate goal of this effort is to produce a definitive version of the FITS Standard, a version which will be approved by the three FITS regional committees and by the IAU FITS Working Group, so that it can replace the FITS papers. Don Wells stated that he would like for this definitive version of the FITS Standard to be published in A&A Supplement. 2. The FITS Y2K (DATE-OBS) Agreement This agreement was adopted by the IAU-FWG in November 1997, one year ago. Don Wells pointed out that full interchange of the new notation is to begin 1999-01-01, only two months from now. He asked who had changed code in response to this agreement, and roughly half of those present raised their hands. 3. IAU Comm5 Task Group [TG] - Designations and OBJECT strings Don Wells reminded the BoF that the IAU TG on Designations has asked that the maximum lengths of OBJECT strings in interchange be increased to at least 26 characters in order to support the IAU standard object designation syntax. The NOST technical panel has addressed this issue and has decided that all string values in FITS headers may be up to 68 characters in length, which will solve the technical aspect of this problem. The real goal is to use object designations which will not be ambiguous when they appear in archival databases; in particular, comments about filter choices, weather, etc., should not be appended to object names in OBJECT strings. Ideally the IAU prefixes and coordinate syntax will be implemented and used in data acquisition systems. Wells urged the BoF to 'help stop namespace pollution!' 4. WCS [World Coordinate System] negotiations Don Wells reminded the BoF that there were a number of WCS issues outstanding after the ADASS'97 [Sonthofen] BoF, even though significant progress was made in negotiations during ADASS'97. Some of the differences of opinion had prevented conclusion of negotiations for several years. Wells reported that in March 1998 he had created a small ad hoc task group [TG] to work on the outstanding technical issues. This TG was expanded to about 15 people in July 1998, and much progress was made, with the result that Wells reported to the BoF that a working consensus now exists. The final major steps of the negotiations occurred during the 24 hours preceding the ADASS'98 BoF. The WCS Agreement which the TG is producing will be the most complex FITS agreement to date; we have been negotiating it for more than a decade. The items below are not the complete agreement, but only the set of important features which were discussed at the BoF. a) Split G&C into two papers The TG will recommend that the Greisen & Calabretta draft WCS paper be split into two papers. The first paper will have a title something like 'Generalized Representations of World Coordinate Systems in FITS', and will specify meta-rules for FITS WCS conventions. The second paper will specify the WCS conventions for celestial coordinates. The meta-rules are needed because the TG expects that eventually there will be a third paper for the spectroscopic case and maybe another paper on time axes. b) Linear transformation to use CDi_j keywords The TG will recommend that the IRAF CDi_j rotation matrix keywords be adopted instead of the PCiiijjj keywords which were suggested in previous drafts of the Greisen & Calabretta paper. This means that CDELTi and CROTAi will not be used. It also means that the WCS agreement will have backwards compatibility with several existing data archives. c) Multiple-WCS support The TG will recommend that optional additional sets of WCS keywords in FITS headers be distinguished from the default set of WCS keywords and from each other by appending a single alphabetic character [A-Z] to all of the WCS keywords. Examples of such keywords could be CRPIX1B, CD2_1C, CRVAL3D and CTYPE2A. Note that the default set of WCS keywords in these cases would still be CRPIX1, CD2_1, CRVAL3 and CTYPE2. Datasystems which do not support the multiple WCS notation will need to regard WCS keywords with trailing non-numeric characters as unrecognized keywords. Discussion of this idea during the BoF exposed new examples of usage which added to the cases which have convinced the TG that multiple-WCS capability will be valuable. The optional appended version code character will restrict the basic WCS keywords to seven characters. Therefore, the TG will recommend that WCS axis numbers be in the range 1-99 (i.e., axes 100-999 will not be supported). d) New distorted-projection capability to be added The TG will recommend that a set of distortion terms analogous to those used in the DSS [Digital Sky Survey] be added to the basic TAN and ARC projections in order to support a variety of optical imaging systems which produce distorted geometries without requiring re-gridding of the vast quantities of data being produced. The goal is to agree on a set of terms which will represent the geometric distortions of all existing optical cameras. The set will include radial terms, analogous to those in the 'ZPN' projection described in the Greisen & Calabretta draft. The majority of imaging systems will be supported by these radial terms. (The 'radial' terms used in the DSS are X(X^2+Y^2), Y(X^2+Y^2), X(X^2+Y^2)^2 and Y(X^2+Y^2)^2; these implement an elliptically-symmetric radial distortion.) The non-radial terms, such as XY^2 and X^2Y, will be particularly useful for re-imaging cameras like HST's WFPC-1 and WFPC-2. Several TG members believe that such cameras have two 'center-points' for their axes, the tangent point of the main telescope and the centers of the field-flattening lenses of the individual cameras; probably two keywords will be defined to specify a center point offset for the polynomial terms (the main telescope's TAN geometry center point will be specified by CRPIXi). Several TG members intend to collect information about existing re-imaging cameras to verify this conjecture. Work is going on to formulate models that describe the small systematic distortions seen in Schmidt astrometry, relative to the ARC projection, and this important special case may justify explicit support in the FITS standard. Whether or not the TG recommends that terms for such models be added to the set of distortion terms, some version of the pixel correction images described in Appendix A of the Greisen & Calabretta draft will probably still be specified to describe the residual random distortion field for the highest precision, widest field applications. The TG expects that most optical cameras will be represented satisfactorily by the polynomial terms alone. The TG will recommend that all WCS parameter values be conveyed by keywords PVi_k (PVk_i?), where i is the index of the parameter and k is the index of the axis. This notation will replace the PROJPi keywords suggested in the Greisen & Calabretta draft. The axis index for WCS keywords will be restricted to 99 or less; note that if the axis index k is 9 or less (the usual case), the parameter index i in PVi_k may range up to 999 without exceeding the seven character limit set by the plan to use an optional appended character for multiple-WCS support. e) WCS discussions and decisions during the BoF session Don Wells encouraged discussion of items (a), (b), (c) and (d). In the course of the discussion, it became clear that items (a), (b) and (c) had firm support from those present at the BoF. The following issues were discussed: - Wells asked whether the distortion projection should be given some new name to distinguish it from TAN and/or ARC; some TG members have worried that the complicated polynomial would confuse newcomers to FITS WCS who need to know that the TAN projection is appropriate for most optical imagery. It became clear that there was a consensus favoring adding the new terms to both the TAN and the ARC projections rather than creating a new projection. Although the leading radial term of the polynomial is sufficient to represent the difference between TAN and ARC (the DSS uses TAN rather than ARC, as you would expect for a Schmidt camera!), maintaining the distinction has a tutorial advantage. - A number of people at the BoF argued that the order of the indices in the PV keyword should be swapped, to PVk_i; presumably the TG will consider this modification. - Wells raised the issue of whether all parameters of a projection should be restricted to the 'Dec-like' axis (as it was with CROTAk), or alternatively should be associated in some agreed-upon fashion with both axes of a celestial projection. Some TG members have preferred to retain the former convention, but there was a clear consensus at the BoF that parameters should be associated with both axes. This convention will have the advantage that analogous polynomial terms associated with the two axes will have the same indices (one of the drafts considered by the TG had the indices of the second axis offset by 20). - Doug Tody suggested that axis_k=0 be used for specifing general parameters that apply to the entire WCS of a multi-WCS group; the TG will need to consider the implications of this detail of the rules. - Tody also raised the issue of whether the datatype of a PV keyword should be restricted to numerical, or defined by the WCS function type to which the parameter is assigned (this case is unusual in that the PV keywords are not fully defined, rather their usage is defined by each WCS). - Some people at the BoF regretted the demise of CROTAi and, especially, CDELTi, since they are so easy to use and feature in many existing files. They are suggesting that CDELTi and CROTAi could function as functional synonyms of CDi_j. (WCS reading code will have to support CDELTi and CROTAi forever because there are many existing files that use these keywords. The question is whether they are to be "deprecated" or will be recognized as "official synonyms".) Upon a motion by Doug Mink, an informal vote was taken to express general support for the work of the TG as described above, and the show of hands in support was unanimous. At this point in the session Don Wells told Eric Greisen that he and Mark Calabretta now had the working consensus which they had specified as a precondition before undertaking the next round of revision of the WCS draft paper. f) WCStools paper in ADASS'98 session Paper T6.2 ('WCSTools: an Image Astrometry Toolkit') was presented by Doug Mink in the afternoon session on Tuesday, the day after the FITS BoF session. The final sentence of the abstract is: 'The proposed FITS WCS standard is being tracked, and interim formats are being supported.' During the questions after Doug Mink spoke, Don Wells exhorted the community to include proper WCS notations in the headers of all optical imagery. Mink's WCSTools software is available at: http://tdc-www.harvard.edu/software/wcstools/. g) New members for the WCS TG? Don Wells told the BoF that he is prepared to add new members to the ad hoc WCS task group, but that such people should understand that they are expected to contribute to the solutions to FITS WCS problems. Wells is especially interested in adding people with knowledge of the geometry of re-imaging cameras, or of Schmidt camera geometry or general knowledge of precision astrometry, in order to complete the design of the distortion correction terms for the TAN and ARC projections. 5. Another Issue discussed at the BoF One person (the Chair does not recall who it was) reported having encountered a FITS tape which was not blocked in accordance with the FITS Blocking Agreement (Section 4.6 in the NOST 100-1.2 [1998-04-02] version of the FITS Standards). The people present at the BoF deplored this, of course. [NOTE: the text of this report has been reviewed by the WCS TG, and corrections/additions suggested by TG members have been made.] -- Donald C. Wells Associate Scientist dwells at nrao.edu http://www.cv.nrao.edu/~dwells National Radio Astronomy Observatory +1-804-296-0277 520 Edgemont Road, Charlottesville, Virginia 22903-2475 USA From owner-fitsbits at kochab.cv.nrao.edu Fri Nov 13 21:48:34 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id VAA02064 for fitsbits-spinner; Fri, 13 Nov 1998 21:48:24 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id VAA02059 for ; Fri, 13 Nov 1998 21:48:21 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id VAA05673 for fitsbits at majordomo.cv.nrao.edu; Fri, 13 Nov 1998 21:48:20 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id TAA01975 for ; Fri, 13 Nov 1998 19:34:48 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id TAA05410 for ; Fri, 13 Nov 1998 19:34:47 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id TAA29198 for ; Fri, 13 Nov 1998 19:34:46 -0500 Received: from galileo.csun.edu(130.166.114.38) by palantir.cv.nrao.edu via smap (V1.3) id sma029195; Fri Nov 13 19:34:37 1998 Received: from localhost (swalton at localhost) by galileo.csun.edu (8.8.6 (PHNE_14041)/8.8.6) with ESMTP id QAA02341 for ; Fri, 13 Nov 1998 16:34:26 -0800 (PST) Date: Fri, 13 Nov 1998 16:34:26 -0800 (PST) From: Stephen Walton Reply-To: swalton at galileo.csun.edu To: fitsbits at fits.cv.nrao.edu Subject: Re: ADASS-FITS-BoF annual report (WCS negotiations) In-Reply-To: <199811132136.QAA05091 at fits.cv.nrao.edu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk I am really pleased to read that so much progress was made on the WCS problem at the BOF meeting. I want to sit down and read Don's report in more detail and digest everything before commenting any further, but it is clear the WCS TG worked hard at reaching a consensus. They are to be commended. -- Stephen Walton, Professor of Physics and Astronomy, California State University, Northridge stephen.walton at csun.edu From owner-fitsbits at kochab.cv.nrao.edu Thu Nov 19 00:53:46 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id AAA19494 for fitsbits-spinner; Thu, 19 Nov 1998 00:53:16 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id AAA19489 for ; Thu, 19 Nov 1998 00:53:12 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id AAA23740 for fitsbits at majordomo.cv.nrao.edu; Thu, 19 Nov 1998 00:53:12 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id OAA08780 for ; Wed, 18 Nov 1998 14:42:44 -0500 (EST) Received: from newsfeed.cv.nrao.edu (newsfeed.cv.nrao.edu [192.33.115.17]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id OAA20685 for ; Wed, 18 Nov 1998 14:42:43 -0500 Received: (from news at localhost) by newsfeed.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id OAA17927; Wed, 18 Nov 1998 14:41:06 -0500 To: fitsbits at fits.cv.nrao.edu Date: 18 Nov 98 19:25:46 GMT From: rpete at ascda3.harvard.edu (Pete Ratzlaff) Message-ID: <36531f3a.0 at cfanews.harvard.edu> Organization: Harvard University Path: newsfeed.cv.nrao.edu!newsgate.duke.edu!newsfeed.berkeley.edu!news.maxwell.syr.edu!newspeer.monmouth.com!newsxfer.itd.umich.edu!gumby!newspump.wustl.edu!rice!mufasa.harvard.edu!cfanews.harvard.edu!ascda3!rpete Subject: CFITSIO.pm - a new Perl module Newsgroups: sci.astro.fits Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk I have put together an initial release of something I started working on a couple of weeks ago: A module for using William Pence's CFITSIO subroutine library. Virtually all functions are available, and for the most part work. There are some small glitches with unkown causes on different architectures. The most serious problem thus far is that fits_open_file() causes a segfault on Solaris 2.5, Perl 5.004. This makes the module essentially unusable for that combination, and is completely dumbfounding since the xsub for fits_open_file() is simple and straightforward. Anyhow, I have numbered this release 0.10, but consider it much further along than that number would indicate. Aside from a handful of problems, in fact, I would consider it mostly finished. Some features: * Over 300 CFITSIO library routines available * Automatic conversion from Perl <-> C datatypes * If given scalar reference as input data, uses the data in the scalar rather than unpacking it. This is mostly for PDL and the use of its get_dataref() method. * Routines which read FITS files default to having the ouptut data packed into N-dimensional Perl arrays. This can be changed with a state-controlling function - PerlyUnpacking() - to reading data into a form compatible with PDL (i.e, scalars). * Thanks to Karl Glazebrook for his PGPLOT module, which gave me a place to begin and a bunch of ideas and code to steal. Okay, if you want to give it a shot, try http://hea-www.harvard.edu/~rpete/cfitsio For more information on the CFITSIO library, see http://heasarc.gsfc.nasa.gov/docs/software/fitsio/fitsio.html -Pete Ratzlaff From owner-fitsbits at kochab.cv.nrao.edu Wed Nov 25 13:36:45 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id NAA06342 for fitsbits-spinner; Wed, 25 Nov 1998 13:34:33 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id NAA06337 for ; Wed, 25 Nov 1998 13:34:29 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id NAA09697 for fitsbits at majordomo.cv.nrao.edu; Wed, 25 Nov 1998 13:34:29 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id QAA20740 for ; Tue, 24 Nov 1998 16:24:47 -0500 (EST) Received: from palantir.cv.nrao.edu (tismail at palantir.cv.nrao.edu [192.33.115.254]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id QAA07149 for ; Tue, 24 Nov 1998 16:24:47 -0500 Received: (from tismail at localhost) by palantir.cv.nrao.edu (8.8.5/8.8.5) id QAA11395 for ; Tue, 24 Nov 1998 16:24:45 -0500 Received: from wheelo.gsfc.nasa.gov(128.183.50.20) by palantir.cv.nrao.edu via smap (V1.3) id sma011382; Tue Nov 24 16:24:16 1998 Received: from tetra.gsfc.nasa.gov (tetra.gsfc.nasa.gov [128.183.16.178]) by wheelo.gsfc.nasa.gov (8.8.8/8.8.8) with SMTP id QAA23194 for ; Tue, 24 Nov 1998 16:17:58 -0500 (EST) Received: from tetra.gsfc.nasa.gov by tetra.gsfc.nasa.gov (SMI-8.6/SMI-SVR4) id QAA16597; Tue, 24 Nov 1998 16:17:54 -0500 Message-ID: <365B2282.FC7E75F6 at tetra.gsfc.nasa.gov> Date: Tue, 24 Nov 1998 16:17:54 -0500 From: William Pence Organization: HEASARC X-Mailer: Mozilla 4.05 [en] (X11; I; SunOS 5.6 sun4u) MIME-Version: 1.0 To: FITSBITS Subject: fv FITS file viewer and editor release Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk FV 2.4 Release Announcement November 24, 1998 Version 2.4 of the fv software tool for viewing and editing any FITS format image or table is now available. Fv has a graphical user interface written using Tcl/Tk. The Fv software distribution ships with everything you need to build (i.e. you do not need Tcl/Tk already installed on your machine). Fv has the following features (items marked with a * are new with this release): *- fv runs under Windows 95/98/NT. *- Files can be opened (read-only) across the internet (http and ftp protocols). FTP sites can be browsed from the "Open File" dialog box. This feature is currently only available on Unix platforms. *- Filename completion eases browsing large directories and typing long names... type the first few letters of a filename and then hit TAB. *- Basic fv functions -- open, display, and plot data -- can be accessed from simple TCL scripts. - A summary window lists the contents and size of all the extensions in the FITS file. - Entire extensions can be copied, cut, and pasted to/from the clipboard which can be saved to a new FITS file. *- New, empty FITS files can be created. Empty extensions of any of the 3 basic types -- image, ASCII table, and binary table -- can be appended to existing files. - FITS headers may be displayed in a scrolling text window. Keywords may be edited, inserted, or deleted, and an ASCII text listing of the header may be generated. *- Checksum keywords can be created or updated when a file is modified. - Selected columns in a FITS table may be viewed in a scrolling spread sheet. The values in the table may be edited, and rows and columns may be inserted or deleted in the table. The contents of the table may be saved to an ASCII text file. *- Keyboard shortcuts (ctrl-c and ctrl-v) simplify the copying and pasting of data between cells. - Tables can be sorted using multiple keys. - When sorting, rows with identical keys may be optionally deleted. - Table rows can be selectively deleted using a boolean expression evaluated for each row. - A spreadsheet calculator function allows you to create new columns by performing arithmetic on existing columns. - Line plots of one or more columns in a table may be generated. Plots are displayed using the POW widget. The user may then zoom in on any area of interest in the plot. The plots may be saved and printed in postscript format. - Individual columns or pairs of columns can be used to produce 1D or 2D histograms, respectively, and plotted in POW. - FITS images may be displayed with the usual pan, zoom, and color table manipulation facilities. Users may choose to use the SAOtng image display tool (available separately from SAO), or the internal image display widget called POW that is supplied with fv. *- Double clicking an image displayed by POW will bring up a fv table of the image data with the clicked pixel highlighted. - Selected rows or columns of an image can be averaged and their pixels plotted in a line graph. Items specific to the POW display widget... - POW supports interactive manipulation of the image colortable (i.e. contrast and bias twiddling). - POW supports TrueColor displays and has more "colormap friendly" support for PsuedoColor display. See the documentation for the "-cmap" fv command line switch or the POW "Color" help menu item for details. *- POW interprets standard FITS World Coordinate System (WCS) keywords, and optionally displays grid lines. (Version 2.4 adds WCS support for curves.) - Once displayed in POW, the contents of graphs can be edited and multiple graphs can be merged into one. Coordinate information (labels, pixel sizes, WCS parameters, etc) can be modified as well. *- Graphs (including those containing images) can be arbitrarily resized. Previous versions only supported integral zoom levels. *- Multiple images can be mosaiced within a single graph. The only restriction is that the images have identical rotations. *- Each curve plotted in a graph can be displayed in a number of line styles/widths, point shapes/sizes, and colors. A single dialog box controls both the graph-level features (labels, contents, etc) and the display styles of each of a graph's curves. - POW can create, read, write, and graphically manipulate regions (boxes, circles, ellipses, polygons, lines, and points). (Data analysis of regions will be added in a later version.) - POW can "blink" a set of images or graphs in rapid sequence. A 3D image cube can be animated in this manner. *- POW can create contour maps of images. Fv currently runs on many Unix platforms, including SUN O/S, SUN Solaris, Dec OSF, and Linux PCs. With this release binaries for Windows PCs are also available. We plan to port fv to run under Mac OS in the coming year. Fv may be obtained from the HEASARC (High Energy Astrophysics Science Archive Research Center) FTOOLS Web site at: http://heasarc.gsfc.nasa.gov/ftools/fv.html See the INSTALL file in the fv distribution for instructions on installing and running fv. Any comments or suggestions about fv should be sent to ftoolshelp at athena.gsfc.nasa.gov. -------- The fv development team currently consists of: William Pence: Project Scientist, author of CFITSIO Lawrence Brown: Tcl/Tk programmer, original author of POW Peter Wilson: Tcl/Tk programmer, fv/POW programmer fv and fitsTcl were originally written by Jianjun Xu. From owner-fitsbits at kochab.cv.nrao.edu Mon Nov 30 09:09:01 1998 Received: (from majordom at localhost) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) id JAA00684 for fitsbits-spinner; Mon, 30 Nov 1998 09:08:06 -0500 (EST) Received: from cv3.cv.nrao.edu (cv3.cv.nrao.edu [192.33.115.2]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id JAA00665 for ; Mon, 30 Nov 1998 09:08:01 -0500 (EST) Received: from fits.cv.nrao.edu (dwells at fits.cv.nrao.edu [192.33.115.8]) by cv3.cv.nrao.edu (8.8.5/8.8.5/CV-2.7) with ESMTP id QAA09583 for ; Sun, 29 Nov 1998 16:39:16 -0500 (EST) Received: (from dwells at localhost) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id QAA18777 for fitsbits at majordomo.cv.nrao.edu; Sun, 29 Nov 1998 16:39:15 -0500 Received: from fits.cv.nrao.edu (root at fits.cv.nrao.edu [192.33.115.8]) by kochab.cv.nrao.edu (8.8.8/8.8.8/CV-2.2) with ESMTP id UAA08307 for ; Fri, 27 Nov 1998 20:00:22 -0500 (EST) Received: from newsfeed.cv.nrao.edu (newsfeed.cv.nrao.edu [192.33.115.17]) by fits.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) with ESMTP id UAA15125 for ; Fri, 27 Nov 1998 20:00:20 -0500 Received: (from news at localhost) by newsfeed.cv.nrao.edu (8.8.7/8.8.8/CV-2.2) id TAA12771; Fri, 27 Nov 1998 19:58:24 -0500 To: fitsbits at fits.cv.nrao.edu Date: Sat, 28 Nov 1998 00:50:50 GMT From: dmunro at sfu.ca (Duncan Munro) Message-ID: <365f4583.13178979 at newsserver.sfu.ca> Organization: Simon Fraser University Path: newsfeed.cv.nrao.edu!newsgate.duke.edu!nntprelay.mathworks.com!news-peer.gip.net!news.gsl.net!gip.net!news.maxwell.syr.edu!cyclone.bc.net!news.sfu.ca!not-for-mail References: <363cf8c8.12998934 at newsserver.sfu.ca> Subject: new port of fitsblink 2.11 for OS/2 Newsgroups: sci.astro.amateur,sci.astro.fits,sci.astro,comp.os.os2.misc,comp.os.os2.apps Sender: owner-fitsbits at kochab.cv.nrao.edu Precedence: bulk Archive Filename: fblink2.zip , replaces fblink.zip Short Description: OS/2 port of Fitsblink 2.11 I have ported Fitsblink 2.11 to Xfree86-OS/2. It is an Fits image viewer and astrometry program. It can pattern-match a fits image with theHubble GSC to determine the precise location of the image. It also has an interface for Telescope and CCD camera control, but this is untested. fblink2.zip has a cleaned up archive and was built with different compiler options than fblink.zip I have uploaded fitsblink as fblink2.zip to hobbes.nmsu.edu. it is now in the incoming directory and the proposed placement is: /pub/os2/apps/astro: It also requires Xforms.88 from : http://borneo.gmd.de/~veit/os2/xf86ported.html and CFitsio142.zip from: ftp://legacy.gsfc.nasa.gov/software/fitsio/c/ The above 2 files are required to compile fitsblink but the exe should work fine with out them. If this is a problem for anyone I can upload the compiled versions of these 2 files to hobbes as well. thanks Duncan Munro dmunro at sfu.ca