Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atnf.csiro.au/computing/software/gipsy/tsk/wfits.dc1 Дата изменения: Sat Oct 9 17:26:58 1999 Дата индексирования: Fri Jan 16 00:08:36 2009 Кодировка: Поисковые слова: apod

Program: WFITS

Purpose: Writes disk set and subsets onto magnetic tape (or disk)
in FITS format.

Category: FITS, TAPES, UTILITY

File: wfits.c

Author: K.G. Begeman

Keywords:

INSET= Set (and subset(s)) where to copy data from.
Maximum number of subsets is 2048.

BOX= Frame of input subsets [entire subset].

FITSFILE= Name of file to write FITS data to [write to tape].
If more than one subset is to be written to FITS file,
a generic filename should be entered. A generic filename
contains fields of consecutive hash (#) symbols.
The filenames of the FITS files will be generated by
replacing each field with the subset sequence number.
The number of hash symbols in a field denotes the field width.
Examples:
FITSFILE=FILE#.FTS generates FILE1.FTS, FILE2.FTS ...
FITSFILE=FILE##.FTS generates FILE01.FTS, FILE02.FTS ...
FITSFILE=FILE###d.FTS generates FILE001.FTS, FILE002.FTS ...
If no hash symbols are present in a generic name, one hash
symbol will be appended.
If data is to be written to file, the following two keywords
will be skipped.

OUTTAPE= Name of output tape device [list of all tape devices].

SKIP= Number of files to skip on OUTTAPE [SKIP to End of Tape].
The first input file will be stored at this location, the
second at the next location etc.
Note that for new (empty) tapes you should give SKIP=0.

BITPIX= Specify number of bits to represent pixel value [16].
This number can be 8, 16, 32, or -32 for IEEE floating point.
For antenna patterns it is advised to take BITPIX=32 (or -32).

** BLOCKED= Specify the number of FITS records / tape record [10].
The maximum blocking factor is 20.

** MNMX= Always calculate min, max Y/[N]?
If the minimum and maximum of the subsets are not found in
the header, they are automatically calculated. If you are
not sure that these header values are correct, give MNMX=Y.

Description: FITS: A Flexible Image Transport System, is a format for
the interchange of astronomical images and other digital
arrays on magnetic tape. This format provides a simple but
powerful mechanism for the unambiguous transmission of
n-dimensional, regularly spaced data arrays. It also
provides a method for the transmission of a virtually
unlimited number of auxiliary parameters that may be
associated with the image. The parameters are written in a
form which is easily interpreted by both humans and
computers (D. C. Wells, Astron. Astrophys. Suppl. Ser. 44,
(1981) 363-370 ).
WFITS creates a FITS header record from the GIPSY header
items and converts the image data (INSET=) to 8, 16, 32
bits integers or to 32 bits IEEE floating point (BITPIX=).
Programs to read FITS files like RFITS, use this header
item to convert tape data to image data.

Updates: Oct 21, 1991: KGB, Modified code for new mtopen routine.
Nov 12, 1991: VOG, 'LONG_MIN' casted twice before assigning
to float because of bug in 'gcc'
Dec 9, 1991: VOG, Put OBJECT in fits header on users
request.
May 14, 1992: VOG, New defaults for MINMAX=
Jul 20, 1993: KGB, Completely rewritten, replaced fts_ and
ftsd_ routines.
Apr 20, 1994: KGB, Minor repairs.
Feb 7, 1996: KGB, Keyword FITSFILE= implemented.
Okt 8, 1999: VOG, Removed non printable characters in record
in gdsd_rfits.