Level 2 Help for GRIDGEN

 STRING-REQUIRED
 Either a grid location file in MARK format (default) or a gridded image
 (see IMAGE keyword).

 KEYWORD-OPTIONAL
 Specifies gridded image output.

 INTEGER-OPTIONAL
 Pixel spacing between intersections.

 INTEGER-OPTIONAL
 GSL and GSS specify the line-sample coordinates of the upper-left-most
 grid intersection.

 INTEGER-OPTIONAL
 Grid starting sample.

 INTEGER-OPTIONAL
 Number of horizontal grid rulings.

 INTEGER-OPTIONAL
 Number of vertical grid rulings.

 INTEGER-OPTIONAL
 Specifies the DN value of the grid rulings for IMAGE mode.

 INTEGER-OPTIONAL
 Specifies the DN value of the background for IMAGE mode.