Help for CUTQUAD

PURPOSE
     CUTQUAD uses a lower left coordinate point to cut a degree quadrangle
     from a geographic image.
	   
CALL
     cutquad INPUT OUTPUT PARAMS
  WHERE:
     INPUT          is the input data set (must have a GeoTIFF label).
     OUTPUT         is the output data set (will have a GeoTIFF label).
     PARAMS         lon,lat,nlon,nlat,pixdeg.

  
OPERATION

The corner given by parameters (lon,lat) is converted to a pixel
coordinate with pixmap referring to the input image.  Then the
size is calculated by pixdeg times nlon and pixdeg times nlat.
One pixel is added for point type images to nl,ns.

Finally gtcopy is applied.  This guarantees no resampling, if the user
ensures that the image aligns with degree quadrangles.
PERFORMANCE

Restrictions
------------

The input image must have a GeoTIFF label and be mapped geo-
graphically.

The input image must align properly with the desired quadrangle,
otherwise resampling will take place.


HISTORY
Original Programmer: A. L. Zobrist, 30 Jan, 2007
Current Cognizant Programmer: A. L. Zobrist
Revised: A. L. Zobrist, 27 Feb, 2007  ll corner
Revised: A. L. Zobrist, 03 Mar, 2007  skirt param
2022-06-28 B. Crocco afids to opensource