double interpolate_altitude( double lon, double lat );
// Use least squares to fit a simpler data set to dem data
double interpolate_altitude( double lon, double lat );
// Use least squares to fit a simpler data set to dem data
void outputmesh_set_pt( int i, int j, double value );
// Write out a node file that can be used by the "triangle" program
void outputmesh_set_pt( int i, int j, double value );
// Write out a node file that can be used by the "triangle" program
// Revision 1.6 1998/06/05 18:14:40 curt
// Abort out early when reading the "A" record if it doesn't look like
// a proper DEM file.
// Revision 1.6 1998/06/05 18:14:40 curt
// Abort out early when reading the "A" record if it doesn't look like
// a proper DEM file.