How to convert Gaskell ICQ model to other formats

Convert to PLT

• Use AltWg tool ICQ2PLT

Convert to OBJ

• Use AltWg tool PLT2OBJ

Convert to GeoTIFF

• Use spheremapsB to convert to a pgm, then GDAL to convert pgm to GeoTIFF. GDAL can also be used to make the GeoTIFF readable by ISIS. Further details can be found in Convert MAP since it is very similar. spheremapsB will work with user specified maps; these maps can be maplets or bigmaps.

Convert to DSK

• This is the format used by NAIF. Use the program mkdsk, which is part of the NAIF SPICE TOOLKIT. Here is how to setup the required files.

mkdsk -setup setup.txt

Here's an example of setup.txt for Tethys. Will need a the leap second kernel naif00112.tls. Here's a link to the NAIF description of how to use mkdsk. Naif MKDSK link. Note that the ICQ must have the first line as the Q size, as laid out in the NAIF link.

\begindata

      INPUT_SHAPE_FILE    = 'TethysGaskell.TXT'
      OUTPUT_DSK_FILE     = 'TethysGaskell.bds'
      LEAPSECONDS_FILE    = ( 'naif0012.tls' )
      COMMENT_FILE        = ' '
      SURFACE_NAME        = 'Gaskell_Tethys_Q512'
      CENTER_NAME         = 'TETHYS'
      REF_FRAME_NAME      = 'IAU_TETHYS'
      START_TIME          = '1950-JAN-1/00:00:00'
      STOP_TIME           = '2050-JAN-1/00:00:00'
      DATA_CLASS          = 1
      INPUT_DATA_UNITS    = ( 'ANGLES    = DEGREES'
                              'DISTANCES = KILOMETERS' )
      COORDINATE_SYSTEM   = 'LATITUDINAL'
      MINIMUM_LATITUDE    =  -90.0
      MAXIMUM_LATITUDE    =   90.0
      MINIMUM_LONGITUDE   = -180.0
      MAXIMUM_LONGITUDE   =  180.0
      DATA_TYPE           = 2
      PLATE_TYPE          = 2

      NAIF_SURFACE_CODE   += 1
      NAIF_SURFACE_NAME   += 'Gaskell_Tethys_Q512'
      NAIF_SURFACE_BODY   += 603

\begintext

Important Parameters

• DATA_TYPE, as of 05 Apr 2017 version, is always set to 2
• PLATE_TYPE should be set to 2 for a Gaskell model.