Tpers

Tilted Perspective is similar to Near-Sided Perspective Projection (nsper) in that it simulates a perspective view from a hight. Where nsper projects onto a plane tangent to the surface, Tilted Perspective orients the plane towards the direction of the view. Thus, extra parameters azi and tilt are required beyond nsper's h. As with nsper, lat_0&lon_0` are also required for satellite position.

• h: height (in meters) above the surface
• azi: bearing (in degrees) from due north
• tilt: angle (in degrees) away from nadir
• lat_0: latitude (in degrees) of the view position
• lon_0: longitude (in degrees) of the view position

The PROJ.4 code for the Tilted Perspective projection is:

  +proj=tpers +lat_0=%f +lon_0=%f +h=%f +tilt=%f +azi=%f