Help for GTCOMP

PURPOSE
     GTCOMP generates a set of points in the first image, then uses the
     GeoTIFF labels to locate the points in the second image.  Then getzval
     is used on both images, using the corresponding points.  The last
     column of the file has the differences of the z values obtained from
     the two images.  If the GeoTIFF labels are correct, the differences
     (for the same underlying data) should be close to zero.
	   
CALL
     GTCOMP INP1 INP2
  WHERE:
     INP1          is the first data set (must have a GeoTIFF label).
     INP2          is the second data set (must have a GeoTIFF label).
     
  
OPERATION

see above.

PERFORMANCE

less than 30 seconds for the largest images.
Restrictions
------------

The input and reference images must have GeoTIFF labels.


Original Programmer: A. L. Zobrist, 02 Apr, 2000
Current Cognizant Programmer: B. A. McGuffie

PARAMETERS: