> "spherical" -180=C2=B0<=3Dx<180=C2=B0, -90=C2=B0<=3Dy<=3D90=C2=B0, z =3D d= "spherical" -180°<=x<180°, -90°<=y<=90° z =distance in meters... > relative to what? "sea level" ? > "linear" just all three values in meters? *sigh* memo to myself... check for HTML encoding when copy&paste... Henning