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12-28-2000
README for gridview

IDL programs and support files for
viewing and manipulating Mars Orbiter Laser Altimeter
(MOLA) grided data.

gridview has been created and tested using IDL version 5.3

Instructions for setup and use:

All file can be downloaded fron the web at:
http://core2.gsfc.nasa.gov/mola_pub/gridview

Files:
  README          : A short introduction and information
  gridview.tar    : All the programs and support files except the grid
  gridview.pro    : A concatenated group of all the IDL routines
  mola_1.sav      : MOLA Grid , this is the first release (1 pixel/deg)
                  : in IDL save format, molaXX.sav, where XX is pix/deg. 
                  : Higher density grids will be released in the future.
  mola_02.sav     : MOLA Grid , this is the second release (2 pixels/deg)
  topo5c.col      : colortable support file
  topomola.col    : colortable support file
  shade_1.col     : colortable support file
  grays3d.col     : colortable support file
  gvrings.dat     : ringfile support file
  
UNIX:
  Get the tar file and the sav file.
  untar the file gridview.tar with the command
     tar xvf gridview.tar

  A directory named gridview will be created, containing the
  program files.

PC/Mac:
  Get all the files except the tar file.


Getting Started:

  UNIX:
    In the gridview directory enter the following commands:
      idl
      gridview
      choose the grid file to load (IDL 'save' format)

  PC/Mac:
    Start IDL
    File - Open gridview
    Run - Run gridview
    choose the grid file to load (IDL 'save' format)


You should be up and running with the program now.

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The program is still in the early stages of development.
If you find any bugs to report or need some help getting 
started or have some ideas for features to add you can 
contact me at "roark@denali.gsfc.nasa.gov".


The program is hard coded to read a MOLA grided data in
IDL "SAVE" format. My "SAVE" format grids are integer arrays 
arranged so that the 0 longitude is in the center of the grid.

         -180 ----- 0 ------ 180  


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Mac Peculiarities:

  You will have to answer a prompted question at the beginning of
  execution as to whether you are running in a "demo" mode of IDL or not.

  To enable "Color Stretching" you need to click once in the root/
  background window or else the image colors will not change as you
  move the sliders.

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Happy computing,

   Jim Roark
   Science Systems Applications, Inc.
   Geodynamics, Code 921
   NASA/GSFC
   Greenbelt, Md. 20771
   roark@denali.gsfc.nasa.gov
   http://denali.gsfc.nasa.gov

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