> > > I think, all "lon"s in the file "radii.c" should read as "lat". .. > > lib/gis/radii.c > > > > can anyone confirm this? Note that the three functions defined in radii.c do not appear to be used anywhere in the source. G_radius_of_conformal_tangent_sphere() G_transverse_radius_of_curvature() G_meridional_radius_of_curvature() Hamish