Both the mappings by Mid-tangent point and the Stereographic projections are one-to-one correspondence with the same domain and range. In 2D, they map a circle minus a point to a line. While in 3D, they map a sphere minus a point to a plane. However the last coordinates of the images of the two maps are the same. For the remaining coordinates, those of the Stereographic projections are twice in magnitude of those of the
Mid-tangent projections.
Mid-tangent projections can be one of definition of the Stereographic projections. Therefore Mid-tangent projections has many utilization as Stereographic projection such ascreating world map but the coordinates of the imager on world map from the Stereographic projections is twice toMid-tangent projections.