Near-sided perspective¶

The near-sided perspective projection simulates a view from a height $$h$$ similar to how a satellite in orbit would see it.

 Classification Azimuthal. Neither conformal nor equal area. Available forms Forward and inverse spherical projection Defined area Global, although for one hemisphere at a time. Alias nsper Domain 2D Input type Geodetic coordinates Output type Projected coordinates

Parameters¶

Required¶

+h=<value>

Height of the view point above the Earth and must be in the same units as the radius of the sphere or semimajor axis of the ellipsoid.

Optional¶

+lon_0=<value>

Longitude of projection center.

Defaults to 0.0.

Note

The default convention is to interpret this value as decimal degrees. To specify radians instead, follow the value with the “r” character.

Example: +lon_0=1.5708r

+lat_0=<value>

Latitude of projection center.

Defaults to 0.0.

Note

The default convention is to interpret this value as decimal degrees. To specify radians instead, follow the value with the “r” character.

Example: +lat_0=1.5708r

+R=<value>

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

+x_0=<value>

False easting.

Defaults to 0.0.

+y_0=<value>

False northing.

Defaults to 0.0.