Help for GTP

PURPOSE
     The analyst can use this proc to quickly convert a (line,sample)
     to geographic coordinate using a GeoTIFF image as a reference.
     
     The inverse can be performed by typing the letter i after the 
     coordinates.
     
     The result is given by printing a one line IBIS file with the user
     input in columns (1,2) and the output in columns (3,4). Column 5
     contains the z value at the point (bilinear interpolation).
	   
CALL
     GTP INP x y
  WHERE:
     INP          is the reference image data set (must have a GeoTIFF label).
     x            is the line (can be integer or fraction)
     y            is the sample (ditto)
     
     GTP INP x y i
  WHERE:
     INP          is the reference image data set (must have a GeoTIFF label).
     x            is the line (can be integer or fraction)
     y            is the sample (ditto)
     i            is the letter "i" as a string input to TAE
  
OPERATION

see above.

PERFORMANCE

instantaneous
Restrictions
------------

The reference image must have a GeoTIFF label.


HISTORY

Original Programmer: A. L. Zobrist, 29 Aug, 2000
Current Cognizant Programmer: B. A. McGuffie

2022-06-27 B. Crocco afids to opensource

PARAMETERS: