| SphericalProj([rot, coord, flipconv]) | This class defines functions for spherical projection. |
| GnomonicProj([rot, coord, xsize, ysize, reso]) | This class provides class methods for Gnomonic projection. |
| MollweideProj([rot, coord, xsize]) | This class provides class methods for Mollweide projection. |
| CartesianProj([rot, coord, xsize, ysize, ...]) | This class provides class methods for Cartesian projection. |