Orthographic¶

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

Classification	Azimuthal
Available forms	Forward and inverse, spherical and ellipsoidal
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

Note

Before PROJ 7.2, only the spherical formulation was implemented. If wanting to replicate PROJ < 7.2 results with newer versions, the ellipsoid must be forced to a sphere, for example by adding a +f=0 parameter.

This projection method corresponds to EPSG:9840.

Parameters¶

Note

All parameters for the projection are optional.

+lon_0=<value>¶

Longitude of projection center.

Defaults to 0.0.

+lat_0=<value>¶

Latitude of projection center.

Defaults to 0.0.

+ellps=<value>¶

The name of a built-in ellipsoid definition.

See Ellipsoids for more information, or execute proj -le for a list of built-in ellipsoid names.

Defaults to “GRS80”.

+R=<value>¶

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

See Ellipsoid size parameters for more information.

+x_0=<value>¶

False easting.

Defaults to 0.0.

+y_0=<value>¶

False northing.

Defaults to 0.0.