Help for MARSPROJ

PURPOSE:
Simple program to accept an XYZ coordinate (expressed in the coordinate
frame specified by COORD), project it through the camera model, and report
the line/sample coordinates of the point in the supplied image.

The coordinates can be output to TAE variables as well via IMAGE_POS
(use v2param to access them).

In some sense, this program is the inverse of marstiexyz.  That takes a
tiepoint in a stereo pair and reports the XYZ location; this takes an XYZ
location and reports the image position.  A stereo image is not needed for
this process.

TBD: Implement reverse projection: given a line/sample position, report
the view ray origin and vector, and its intersection (if any) with the
surface model.  Possibly even its intersection with another view ray a la
marsxyz.

EXECUTION:
marsproj inp=input.img xyz=\(3.4, 2.2, -1.0\) -rover


METHOD:
marsproj takes the given point, projects it through the camera model, and
reports the result.  Couldn't be simpler.

HISTORY:
Oct. 07  Initial version: B. Deen
COGNIZANT PROGRAMMER:  Bob Deen