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ISIS Documentation

skypt

Converts between sample/line and ra/ dec positions

This program requires the user supply a "level 1" cube. That is, a cube in raw camera geometry. The user must also enter one of the following coordinates: 
     sample/line
      ra/dec
The program will then compute the other coordinates and the ephemeris time and pixel dn value.

Hint: If you would like to use this program for multiple points, look into the -batchlist option.

Categories

History

Elizabeth Miller2006-03-21 Original version
Elizabeth Miller2006-03-31 Modified to output pvl and flat format files and added append option
Elizabeth Miller2006-04-14 Added check for valid samp/line and ra/dec positions
Tracie Sucharski2006-04-21 Do not check error on SetImage, because there might not be an intersection on the planet when dealing with sky images.
Sean Crosby2007-04-12 Changed flatfile output so it duplicates PVL data. User now required to enter a flatfile name.
Debbie A. Cook2012-07-06 Updated Spice members to be more compliant with Isis coding standards. References #972.
Kelvin Rodriguez2016-06-27 Added functionality to compute celestial north clock angle, References #2365.
Sarah Sutton2024-03-26 Converted to a callable app. References #5443.

Parameters

Files

Input cube with appropriate camera labels (Instrument and kernel groups)
Type cube
File Mode input
Filter *.cub

The output list will be a text file and will contain the filename, sample, line, ra, dec, et, and dn values. The values will be written out in pvl or flat format, depending on what the user selects for the FORMAT parameter.
Type filename
File Mode output
Internal Default None

Format type for output file. Pvl format is default.
Type string
Default PVL
Option List:
Option Brief Description
PVL Pvl Format Output file will be in pvl format.
FLAT FlatFile Format Output file will be a comma deliminated flatfile. This file format can easily be imported into excel.

If this option is selected, the output from the application will be appended to the file. If it is not selected, any information in the TO file will be overwritten. This option is selected by default.
Type boolean
Default TRUE

Position

This parameter is used to select the type of coordinate which will be used to compute the other two remaining coordinates.
Type string
Default IMAGE
Option List:
Option Brief Description
IMAGEInterprets the coordinate as sample/line This option interprets the coordinate as sample/line and will compute teh right ascension/declination

Exclusions

  • RA
  • DEC

Inclusions

  • SAMPLE
  • LINE
SKYInterprets the coordinates as ra/dec This option interprets the coordinate as right ascension/declination and will compute sample/line

Exclusions

  • SAMPLE
  • LINE

Inclusions

  • RA
  • DEC

This is the sample position used to compute information about the camera state at the pixel.
Type double

This is the line position used to compute information about the camera state at the pixel.
Type double

This is the right ascension value used to compute information about the camera state at the pixel.
Type double

This is the declination value used to compute information about the camera state at the pixel.
Type double