The GIS users guide
Associated software note is #55, the User Manual.
- If you are a new GIS user please visit the 'First steps' link in the left hand side menu
- If you are an experienced GIS user please visit the 'In detail' link in the left hand side menu
Reading GIS data into your IDL session:
1. Via a catalogue
GIS data can be located and loaded into your IDL session using xcat. The routine can also be used for displaying spectra.
IDL> xcat, qlds
Then under the Read & View FITS File tab select the Read and Exit with QL data structure? to load a quick look data structure into the IDL session.
The quick look data structure is the standard format of data used by the CDS software. It contains the spectral data, some wavelength calibration information, ancillary information about spacecraft pointing, and much more in a hierarchal structure.
2. Loading files from a personal directory (eg. s4384r00.fits)
IDL> qlds = readcdsfits('s4384r00')
A quick look at the data can be done through the cds_snapshot routine
IDL> cds_snapshot, qlds [, /log]
To browse information in the qlds type:
IDL> help, qlds, /str
IDL> help, qlds.header, /str
IDL> print, qlds.hdrtext
Now go to the GIS First Steps page