./toolbox/io
line_index__define.pro

INDEX_FILE
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+-line_index

All known superclasses:

INDEX_FILE

Last modification date:

Thu Jun 2 23:56:08 2005

Child class of INDEX_FILE, contains special functionality for dealing with spectral line data. This mostly entails the translation of sdfits data into contents of the index file. See UML for all IO Classes, or INDEX UML for just index classes. This class is responsible for establishing the correct class for managing the row section of the index file, the translation between sdfits and index rows, translation from spectra to index rows, and provides the search gateway.

Fields Summary
IF_FILLER object reference	object dedicating to filling if numbers for sdfits rows

Fields inherited from INDEX_FILE:

string   FILE_NAME longword integer   LUN longword integer   FILE_LOADED string   FILE_PATH object reference   HEADER object reference   ROWS string   ROWS_CLASS pointer   ROW_LINES string   VERSION longword integer   SPROTECT structure [1]  INFO longword integer   DEBUG

Routine Summary  19 routines

procedure line_index__define
Child class of INDEX_FILE, contains special functionality for dealing with spectral line data.

function LINE_INDEX::init(_EXTRA=_EXTRA)	private
Class Constructor - special formats for spectral line initialized here

procedure LINE_INDEX::cleanup	private
Class Destructor - cleanup resources

function LINE_INDEX::get_row_info_strct()	private
Returns the specail structure needed for spectral line data

function LINE_INDEX::search_index([start][, finish], SEARCH=SEARCH, [INDEX=long], [PROJECT=string], [FILE=string], [EXTENSION=long], [ROW=long], [SOURCE=string], [PROCEDURE=string], [E2ESCAN=long], [SUBSCAN=long], [SCAN=long], [POLARIZATION=string], [PLNUM=long ], [IFNUM=long ], [FEED=long], [FDNUM=long], [INT=long], [NUMCHN=long], [SIG=string], [CAL=string], [SAMPLER=string], [AZIMUTH=string], [ELEVATION=string], [LONGITUDE=string], [LATITUDE=string], [LST=string], [CENTFREQ=string], [RESTFREQ=string], [VELOCITY=string], [RESOLUTION=string], [DATEOBS=string], [BANDWIDTH=double], [EXPOSURE=double], [TSYS=double], [NSAVE=long])

This method searches the rows in the index file using the optional keywords.

function LINE_INDEX::parse_extension_rows(rows, proj, file_name, ext, missing, virtuals, start)
Translates raw sdfits rows into the rows to be written to the index file.

procedure LINE_INDEX::update_file, ext_rows, proj, file_name, ext, missing, virtuals, start_row
Appends row info to an index file, given a group of rows from sdfits files.

function LINE_INDEX::get_if_numbers(scan_rows, names, ints, index_start, index_end)	private
Algorithm for assigning if numbers for each row in the index file (zero-based).

function LINE_INDEX::get_integration_numbers(scan_rows, names)	private
Algorithm for determining integration numbers (0-based), given the sdfits rows of a scan.

function LINE_INDEX::get_feed_numbers(scan_rows, names)	private
Algorithm for determining feed numbers (0-based), given the sdfits rows of a scan.

function LINE_INDEX::get_scan_info(scan_number)
Returns a structure that contains info about the scan number given, such as scan number, procedure name, number of integrations, ifs, etc.

procedure LINE_INDEX::update_with_spectra, spectra, file_name, extension, start_row
Appends row info to an index file, given a group of spectra.

procedure LINE_INDEX::replace_with_spectrum, index, spectrum, file_name, extension, row_num
Replaces a line specified by index number in the index rows section, with information derived from a given spectral line data container, and that specturm's location (sdfits file, ext, row) Used when a row has been rewritten in an sdfits file with a new spectra (via nsave, for example).

function LINE_INDEX::spectrum_to_info(spectrum, index, file_name, extension, row_num)	private
Translates information in a single spectral line data container, along with this data containers location in the sdfits file and index file, into a line in the rows section of the index file

function LINE_INDEX::spectra_to_info(spectra, file_name, extension, start)	private
Translates spectral line data containers directly into the rows to be written to index file.

procedure LINE_INDEX::set_debug_on
Makes object verbose

procedure LINE_INDEX::set_debug_off
Makes object quiet

procedure LINE_INDEX::get_file_properties_in_index, file_name, extensions, num_rows	private
Finds the number and sizes of extensions for a file listed in the index file, according to the index file.

function LINE_INDEX::get_center_frequency(ref_freq, ref_chan, freq_interval, num_chan)
Returns the center frequency using the following equation: center_chan = (double(num_chan)/2.

Routine Details

line_index__define

procedure line_index__define

Child class of INDEX_FILE, contains special functionality for dealing with spectral line data. This mostly entails the translation of sdfits data into contents of the index file. See UML for all IO Classes, or INDEX UML for just index classes. This class is responsible for establishing the correct class for managing the row section of the index file, the translation between sdfits and index rows, translation from spectra to index rows, and provides the search gateway.

LINE_INDEX::init

private

function LINE_INDEX::init(_EXTRA=_EXTRA)

Class Constructor - special formats for spectral line initialized here

Keywords
_EXTRA	.

LINE_INDEX::cleanup

private

procedure LINE_INDEX::cleanup

Class Destructor - cleanup resources

LINE_INDEX::get_row_info_strct

private

function LINE_INDEX::get_row_info_strct()

Returns the specail structure needed for spectral line data

Returns

line_row_info_strct structure

LINE_INDEX::search_index

function LINE_INDEX::search_index([start][, finish], SEARCH=SEARCH, [INDEX=long], [PROJECT=string], [FILE=string], [EXTENSION=long], [ROW=long], [SOURCE=string], [PROCEDURE=string], [E2ESCAN=long], [SUBSCAN=long], [SCAN=long], [POLARIZATION=string], [PLNUM=long ], [IFNUM=long ], [FEED=long], [FDNUM=long], [INT=long], [NUMCHN=long], [SIG=string], [CAL=string], [SAMPLER=string], [AZIMUTH=string], [ELEVATION=string], [LONGITUDE=string], [LATITUDE=string], [LST=string], [CENTFREQ=string], [RESTFREQ=string], [VELOCITY=string], [RESOLUTION=string], [DATEOBS=string], [BANDWIDTH=double], [EXPOSURE=double], [TSYS=double], [NSAVE=long])

This method searches the rows in the index file using the optional keywords. Not using any keywords returns all rows. Multiple keywords are combined with a logical AND.

Returns

Array of longs, each element corresponding to a line number of the index file that matches the search

LINE_INDEX::parse_extension_rows

function LINE_INDEX::parse_extension_rows(rows, proj, file_name, ext, missing, virtuals, start)

Translates raw sdfits rows into the rows to be written to the index file. This is where all the algorithms are implemented for determining if and integration numbers.

Returns

arrays of structures representing lines to be written to index file

Uses

INDEX_FILE::get_row_info_strct LINE_INDEX::get_integreation_number LINE_INDEX::get_if_numbers INDEX_FILE::get_row_value

LINE_INDEX::update_file

procedure LINE_INDEX::update_file, ext_rows, proj, file_name, ext, missing, virtuals, start_row

Appends row info to an index file, given a group of rows from sdfits files. Used for first loading in an sdfits file

Uses

LINE_INDEX::spectra_to_info LINE_INDEX::update_index_file

LINE_INDEX::get_if_numbers

private

function LINE_INDEX::get_if_numbers(scan_rows, names, ints, index_start, index_end)

Algorithm for assigning if numbers for each row in the index file (zero-based). First, only first integrations are looked at. Of these, only where the SIG column is True are used. Finally of these, unique combinations of (CRVAL1, CTYPE1, CDELT1, and CRPIX1) columns are used to compute the number of ifs in the scan. These if numbers are assigned to where those unique combinations occur, and the unassigned numbers are 'back filled' using the integration numbers as a guide.

Returns

an array for if numbers of each row in index file for this scan (ex: [0,0,1,1,2,2,0,0,1,1,2,2,,...])

Uses

INDEX_FILE::get_col_variability

LINE_INDEX::get_integration_numbers

private

function LINE_INDEX::get_integration_numbers(scan_rows, names)

Algorithm for determining integration numbers (0-based), given the sdfits rows of a scan. This is simple: just use the LST column values.

Returns

an array for integration numbers of each row in index file for this scan (ex: [0,0,1,1,2,2,3,3,...])

Uses

INDEX_FILE::get_col_variability

LINE_INDEX::get_feed_numbers

private

function LINE_INDEX::get_feed_numbers(scan_rows, names)

Algorithm for determining feed numbers (0-based), given the sdfits rows of a scan.

Returns

an array for feed numbers of each row in index file for this scan (ex: [0,0,1,1,2,2,3,3,...])

Uses

INDEX_FILE::get_col_variability

LINE_INDEX::get_scan_info

function LINE_INDEX::get_scan_info(scan_number)

Returns a structure that contains info about the scan number given, such as scan number, procedure name, number of integrations, ifs, etc..

Returns

Structure containing info on scan

LINE_INDEX::update_with_spectra

procedure LINE_INDEX::update_with_spectra, spectra, file_name, extension, start_row

Appends row info to an index file, given a group of spectra. Used for when these spectra have been written to an sdifts file.

Uses

LINE_INDEX::spectra_to_info LINE_INDEX::update_index_file

LINE_INDEX::replace_with_spectrum

procedure LINE_INDEX::replace_with_spectrum, index, spectrum, file_name, extension, row_num

Replaces a line specified by index number in the index rows section, with information derived from a given spectral line data container, and that specturm's location (sdfits file, ext, row) Used when a row has been rewritten in an sdfits file with a new spectra (via nsave, for example).

Uses

LINE_INDEX::spectra_to_info

LINE_INDEX::spectrum_to_info

private

function LINE_INDEX::spectrum_to_info(spectrum, index, file_name, extension, row_num)

Translates information in a single spectral line data container, along with this data containers location in the sdfits file and index file, into a line in the rows section of the index file

Returns

structure representing a row in the index file

Uses

INDEX_FILE::get_row_info_strct

LINE_INDEX::spectra_to_info

private

function LINE_INDEX::spectra_to_info(spectra, file_name, extension, start)

Translates spectral line data containers directly into the rows to be written to index file. No specail coding here, since an index file was used to create this data container at some point. This assumes that the spectra have been recenlty appended to the file in param file_name.

Returns

structures representing a row in the index file

Uses

INDEX_FILE::get_row_info_strct LINE_INDEX::spectrum_to_info

LINE_INDEX::set_debug_on

procedure LINE_INDEX::set_debug_on

Makes object verbose

LINE_INDEX::set_debug_off

procedure LINE_INDEX::set_debug_off

Makes object quiet

LINE_INDEX::get_file_properties_in_index

private

procedure LINE_INDEX::get_file_properties_in_index, file_name, extensions, num_rows

Finds the number and sizes of extensions for a file listed in the index file, according to the index file.

Parameters
file_name in string	file whose properties are being queried
extensions out variable	number of extensions for this file
num_rows out variable	array showing how many rows in each extension for this file

LINE_INDEX::get_center_frequency

function LINE_INDEX::get_center_frequency(ref_freq, ref_chan, freq_interval, num_chan)

Returns the center frequency using the following equation:

    center_chan = (double(num_chan)/2.0)-0.5D
    center_freq = (((center_chan - double(ref_chan))*freq_interval)+ref_freq