./toolbox/io
fits__define.pro

Last modification date:

Thu Jun 2 23:56:08 2005

Provides basic interface for reading and writing fits files

Fields Summary
FILE_NAME string	full path name to the fits file
NUM_EXTENSIONS longword integer	number of extensions for this file
EXTENSION_NAMES pointer	pointer to list of names for each extension
EXTENSION_TYPES pointer	pointer to list of types for each extension
AXIS pointer	pointer to 2-D array with info on each extension
PRIMARY_HEADER object reference	fits_header_parsert object for primary header
EXT_HEADER object reference	fits_header_parsert object for last extension header
PROPERTIES_KNOWN longword integer	flag signaling if above fields are valid
DEBUG longword integer	flag for determining if debug printouts occur
VERSION string	string denoting what version of the io modules

Routine Summary  35 routines

procedure fits__define
Provides basic interface for reading and writing fits files

function FITS::init([file_name], version=version)
Class Constructor - if file name is passed and it exists, the properties of this file are determined and stored

procedure FITS::cleanup	private
Class Destructor

function FITS::get_version()
Retrieves this objects version number

procedure FITS::set_version, ver
Sets the version number of this object

procedure FITS::set_debug_on
Makes object verbose

procedure FITS::set_debug_off
Makes object quiet

procedure FITS::update_properties
Determins properties of file and last extension, and sotres them

procedure FITS::update_file_properties
Determines and stores the fits files number of extenions, names & types of each extension, and more info on each extension, plus read in primry header keywords

procedure FITS::update_last_extension_properties
Determines and stores info on the last extension of the file

procedure FITS::set_file_name, file_name
Sets the full path name of the fits file

function FITS::get_full_file_name()
Retrieves the full path name of the fits file

function FITS::get_file_name()
Retrieves just the file name of the fits file (no path)

function FITS::file_exists([file_name=string])
Checks if fits file represented by object (or keyword) exist on disk

function FITS::get_number_extensions()
Returns the number of extensions of this fits file

function FITS::get_extension_type(ext_num)
Returns the type of the given extension

function FITS::get_extension_name(ext_num)
Returns the name of the given extension

function FITS::get_ext_num_rows(ext_num)
REturns the number of rows for this extension

function FITS::get_rows([ext=long], [row_nums=array])
Returns the contents of the gvein extension and row numbers for this fits file.

procedure FITS::create_extension_header_struct, hdr_lines	private
Creates a new header struct using the string array from the extension header

procedure FITS::create_primary_header_struct, hdr_lines	private
Creates a new header struct using the string array from the primary header

procedure FITS::list_extension_header
Prints the contents of the header of the last read extension

function FITS::get_extension_header_value(keyword)
Retrieves the value of a keyword in the last read extension

procedure FITS::write_rows_new_extension, rows[, virtuals]
Appends a new extension to fits file and adds rows to it.

procedure FITS::append_rows_to_extension, rows
Appends rows to last extension in fits file

function FITS::get_column_type(extension[, column_number], [column_name=string])
Retrieves the TFROM# value for an extension column specified either by number or name

function FITS::row_compatible_with_extension(row, extension)
Called before an extension is appended to with new rows.

function FITS::make_header_array(virtuals)
Converts a structure containing keyword-values and returns a string array suitable for using to add to extension header

function FITS::get_logical_columns(forms, n_logic_cols)	private
Given the TFORMs found in extension header, finds which ones are of type '1L'

function FITS::fits_type_to_idl_type(fits_type[, idl_size])	private
Converts fits TFORM# keyword value to it's IDL integer type

function FITS::get_uniques(arr)	private
Sorts array, and returns all unique values of sort

procedure FITS::modify_row_column, extension, row_num, col_num, value
Overwrites a value in a fits file, identified by extension number, row number, and column number.

procedure FITS::modify_rows, extension, row_nums, rows
Overwrites entire rows in fits extension

function FITS::get_column_num(extension, col_name)	private
Retrieves the column number for a given column name and extension.

procedure FITS::modify_row_col_name, extension, row_num, column_name, value
Modifies a 'cell' in a fits file, by specifiying the extension, row number, column name, and the value to replace 'cell' with.

Routine Details

fits__define

procedure fits__define

Provides basic interface for reading and writing fits files

FITS::init

function FITS::init([file_name], version=version)

Class Constructor - if file name is passed and it exists, the properties of this file are determined and stored

Parameters
file_name in, optional string	full path name to fits file

Keywords
version	.

FITS::cleanup

private

procedure FITS::cleanup

Class Destructor

FITS::get_version

function FITS::get_version()

Retrieves this objects version number

Returns

version number

FITS::set_version

procedure FITS::set_version, ver

Sets the version number of this object

Parameters
ver	.

FITS::set_debug_on

procedure FITS::set_debug_on

Makes object verbose

FITS::set_debug_off

procedure FITS::set_debug_off

Makes object quiet

FITS::update_properties

procedure FITS::update_properties

Determins properties of file and last extension, and sotres them

Uses

FITS::update_file_properties FITS::update_last_extension_properties

FITS::update_file_properties

procedure FITS::update_file_properties

Determines and stores the fits files number of extenions, names & types of each extension, and more info on each extension, plus read in primry header keywords

Uses

FITS_OPEN FITS_CLOSE

FITS::update_last_extension_properties

procedure FITS::update_last_extension_properties

Determines and stores info on the last extension of the file

Uses

FXBOPEN FXBCLOSE FITS_HEADER_PARSER::create_extension_header_struct

FITS::set_file_name

procedure FITS::set_file_name, file_name

Sets the full path name of the fits file

Parameters
file_name in string	full path name of fits file

FITS::get_full_file_name

function FITS::get_full_file_name()

Retrieves the full path name of the fits file

Returns

full path name of fits file

FITS::get_file_name

function FITS::get_file_name()

Retrieves just the file name of the fits file (no path)

Returns

file name of fits file

FITS::file_exists

function FITS::file_exists([file_name=string])

Checks if fits file represented by object (or keyword) exist on disk

Returns

0,1

Uses

file_info

FITS::get_number_extensions

function FITS::get_number_extensions()

Returns the number of extensions of this fits file

Returns

number of extensions

FITS::get_extension_type

function FITS::get_extension_type(ext_num)

Returns the type of the given extension

Returns

extension type

FITS::get_extension_name

function FITS::get_extension_name(ext_num)

Returns the name of the given extension

Returns

extension name

FITS::get_ext_num_rows

function FITS::get_ext_num_rows(ext_num)

REturns the number of rows for this extension

Returns

number of rows

FITS::get_rows

function FITS::get_rows([ext=long], [row_nums=array])

Returns the contents of the gvein extension and row numbers for this fits file. Also updates properties of this extension that was read.

Returns

array of structures representing each row read

Uses

mrdfits FITS::create_extension_header_struct

FITS::create_extension_header_struct

private

procedure FITS::create_extension_header_struct, hdr_lines

Creates a new header struct using the string array from the extension header

Parameters
hdr_lines in array	string array of extension header returned by mrdfits

FITS::create_primary_header_struct

private

procedure FITS::create_primary_header_struct, hdr_lines

Creates a new header struct using the string array from the primary header

Parameters
hdr_lines in array	string array of primary header returned by FITS_READ

FITS::list_extension_header

procedure FITS::list_extension_header

Prints the contents of the header of the last read extension

Uses

FITS_HEADER_PARSER::list

FITS::get_extension_header_value

function FITS::get_extension_header_value(keyword)

Retrieves the value of a keyword in the last read extension

Returns

value of keyword

Uses

FITS_HEADER_PARSER::get_key_value

FITS::write_rows_new_extension

procedure FITS::write_rows_new_extension, rows[, virtuals]

Appends a new extension to fits file and adds rows to it. Additional keywords are added to the extesnion header, and fits files properties are updated.

Uses

FITS::make_header_array mwrfits

FITS::append_rows_to_extension

procedure FITS::append_rows_to_extension, rows

Appends rows to last extension in fits file

Uses

FXBOPEN FXBGROW FXBFIND FXBWRITE FXBFINISH FITS::get_logical_columsn

FITS::get_column_type

function FITS::get_column_type(extension[, column_number], [column_name=string])

Retrieves the TFROM# value for an extension column specified either by number or name

Returns

string specifiying fits type ('1A','1024E').

FITS::row_compatible_with_extension

function FITS::row_compatible_with_extension(row, extension)

Called before an extension is appended to with new rows. Checks to see if a representative of these rows has properties that match the existing columns of the extension. For each tag in the row structure, its name and type is compared to the column, in increasing order.

Returns

0 - row not compatible to extension, 1 - row compatible to extension

FITS::make_header_array

function FITS::make_header_array(virtuals)

Converts a structure containing keyword-values and returns a string array suitable for using to add to extension header

Returns

string array suitable for using to add to extension header.

FITS::get_logical_columns

private

function FITS::get_logical_columns(forms, n_logic_cols)

Given the TFORMs found in extension header, finds which ones are of type '1L'

Returns

indicis where forms [i] is of type '1L'

FITS::fits_type_to_idl_type

private

function FITS::fits_type_to_idl_type(fits_type[, idl_size])

Converts fits TFORM# keyword value to it's IDL integer type

Returns

integer idl data type code

FITS::get_uniques

private

function FITS::get_uniques(arr)

Sorts array, and returns all unique values of sort

Returns

uniqe values of array

FITS::modify_row_column

procedure FITS::modify_row_column, extension, row_num, col_num, value

Overwrites a value in a fits file, identified by extension number, row number, and column number.

Uses

FXBOPEN FXBFIND FXBWRITE FXBFINISH FITS::get_logical_columsn

FITS::modify_rows

procedure FITS::modify_rows, extension, row_nums, rows

Overwrites entire rows in fits extension

Uses

FXBOPEN FXBFIND FXBWRITE FXBFINISH FITS::get_logical_columsn

FITS::get_column_num

private

function FITS::get_column_num(extension, col_name)

Retrieves the column number for a given column name and extension. Note that column name refers to name in the header line: TTYPEn = 'name'

Returns

integer representing the column number of the name passed in.

Uses

FXBOPEN FXBFIND FXBFINISH

FITS::modify_row_col_name

procedure FITS::modify_row_col_name, extension, row_num, column_name, value

Modifies a 'cell' in a fits file, by specifiying the extension, row number, column name, and the value to replace 'cell' with.

Uses

modify_row_col get_column_num