[Proj] Using libproj with array data

[James Gallagher]

Hi, I hope this is not a FAQ or covered in the existing docs; I've  
checked and apologize if I missed something obvious.

I have a data server which is used to access a number of files of  
georeferenced data stored in two dimentional arrays. For each array,  
I know the longitude and latitude values at the corners as well as  
the projection and datum. Is there a way I can use libproj to map  
long/lat locations to indices within the arrays?

Thanks,
James
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James Gallagher                jgallagher at opendap.org
OPeNDAP, Inc                   406.723.8663