lwscoadd_koa

Name

lwscoadd_koa -- Convert raw 6-dimensional LWS image to 2-D FITS frame

Purpose

Read an FITS file generated by the W. M. Keck Observatory's Long Wavelength Spectrometer (LWS) into IDL data and header variables, coadds extensions, and writes result to output FITS file.

filename: Scalar string containing the name of the FITS file (including extension) to be read. If the filename has a *.gz extension, it will be treated as a gzip compressed file. If it has a .Z extension, it will be treated as a Unix compressed file.

Outputs

result: Co-added (2-D) FITS FITS files constructed from designated record.

Example

Read an LWS FITS file TEST.FITS into an IDL image array, coadd the array and write to TEST_coadded.fits FITS file in same directory
```
IDL> lwscoadd_koa, TEST.FITS, TEST_coadded.fits
```

Error Handling

If an error is encountered reading the FITS file, then the error message is displayed

Procedures Used

Functions: READFITS(), SXPAR(), WHERENAN()
Procedures: IEEE_TO_HOST, SXADDPAR, SXDELPAR

Requirements

Needs routines listed above from the IDL Astronomy Library.

Note

Under Unix, lwscoadd_koa can also read gzip or Unix compressed FITS files. See this description for other ways of reading FITS files with IDL.

Author

Gregory D. Wirth, W. M. Keck Observatory

Support

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Modification History

19-Jan-2000 [GDW]

Original version

22-Aug-2014 [JH]

Modifications for KOA:

Removed messages silent option & returned-numbers added writefits
added writefits