Return polar radius based on projection
Return polar radius based on projection

The polar radius is different if we are using a spherical projection
so return the value based on the projection being used.

OpenGeoscience/geojs,OpenGeoscience/geojs,essamjoubori/geojs,Kitware/geojs,Kitware/geojs,dcjohnston/geojs,essamjoubori/geojs,OpenGeoscience/geojs,Kitware/geojs,dcjohnston/geojs,dcjohnston/geojs,essamjoubori/geojs,dcjohnston/geojs,essamjoubori/geojs