The orthographic projection is a perspective azimuthal projection centered around a given latitude and longitude.

Classification Azimuthal
Available forms Forward and inverse, spherical projection
Defined area Global, although only one hemisphere can be seen at a time
Alias ortho
Domain 2D
Input type Geodetic coordinates
Output type Projected coordinates

proj-string: +proj=ortho



All parameters for the projection are optional.


Longitude of projection center.

Defaults to 0.0.


Latitude of projection center.

Defaults to 0.0.


Radius of the sphere given in meters. If used in conjunction with +ellps +R takes precedence.


False easting.

Defaults to 0.0.


False northing.

Defaults to 0.0.