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 |
proj-string: +proj=nsper +h=3000000 +lat_0=-20 +lon_0=145¶
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=1.570796r
See Projection Units for more information.
- +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=1.570796r
See Projection Units for more information.
- +R=<value>¶
Radius of the sphere, given in meters. If used in conjunction with
+ellps,+Rtakes 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.