./toolbox/io
File cntm_sdfits__define.pro

FITS
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+-SDFITS
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  +-cntm_sdfits

All known superclasses:

SDFITS, FITS

Last modification date:

Wed Dec 8 11:57:36 2004

This Class provides an interface for reading/writing sdfits files that contain continuum data

Routine Summary  6 routines

procedure cntm_sdfits__define
This Class provides an interface for reading/writing sdfits files that contain continuum data

function CNTM_SDFITS::init([file_name], [/new])
Class Constructor - if file name passed and file exists, file's validity checked

function CNTM_SDFITS::check_file_validity(_EXTRA=_EXTRA)
Checks file for basic validity, and also that it contains continuum data

function CNTM_SDFITS::get_scan_starts(extension)
For a given extension, returns the row numbers that represent the start of a scan

function CNTM_SDFITS::get_cntm_scan_properties(ext, start_row, end_row, project, samplers, sigs, cals, sampler_pols)
Determine the significant properites of the continuum scan starting at the row given.

function CNTM_SDFITS::get_cntm_data(extension, start, num_rows, stride, data, missing, virtuals)
Retrieves the data for this scan.

Routine Details

cntm_sdfits__define

procedure cntm_sdfits__define

This Class provides an interface for reading/writing sdfits files that contain continuum data

Inherits

sdfits

Class Constructor - if file name passed and file exists, file's validity checked

Uses

CNTM_SDFITS::check_file_validity

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

Keywords
new in, optional boolean	is this a new file?

Checks file for basic validity, and also that it contains continuum data

Returns

0,1

Uses

SDFITS::check_sdfits_properites

Keywords
_EXTRA	.

For a given extension, returns the row numbers that represent the start of a scan

Returns

row numbers that are at the start of a scan

Uses

fxbopen fxbread fxbclose

Parameters
extension in long	extension number (1-based)

Determine the significant properites of the continuum scan starting at the row given. Continuum data is interwoven and spread across rows; using mrdfits here would be inefficient; thus we read only the first row, and then certain columns.

Returns

the first row of the scan

Uses

SDFITS::get_and eval_rows CNTM_SDFITS::get_column fxbopen fxbclose

Parameters
ext in long	extension
start_row in long	the row the scan starts at
end_row in long	the row the scan ends at
project out string	project id
samplers out array	the unique samplers for this scan
sigs out array	the unique signals in this scan (1 or 2)
cals out array	the unique cal states in this scan (1 or 2)
sampler_pols out array	for each sampler, this is the polarization

Retrieves the data for this scan. Unlike spectral line data, continuum data is dispersed across more then one row, and interwoven for one scan. Thus what is accomplished with spectral line by reading just one row is more complicated here.

Returns

first row of continuum data

Uses

SDFITS::get_and_eval_rows CNTM_SDFITS::get_float_column CNTM_SDFITS::get_string_column fxbopen fxbclose

Parameters
extension in long	extension number
start in long	row to start reading from
num_rows in long	how many rows to read in from the start
stride in long	the spacing between each row that we read in
data out struct	structure with pointers to all the data for this scan (data, az, el, ...)
missing out array	string array of expected sdfits columns that were not found
virtuals out struct	keywords from the extension header that do not describe columns