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.. _tpers:
********************************************************************************
Tilted perspective
********************************************************************************
+---------------------+----------------------------------------------------------+
| **Classification** | Azimuthal |
+---------------------+----------------------------------------------------------+
| **Available forms** | Forward and inverse, spherical projection |
+---------------------+----------------------------------------------------------+
| **Defined area** | Global |
+---------------------+----------------------------------------------------------+
| **Implemented by** | Gerald I. Evenden |
+---------------------+----------------------------------------------------------+
| **Options** |
+---------------------+----------------------------------------------------------+
| `+h` | Height (in meters) above the surface. Required. |
+---------------------+----------------------------------------------------------+
| `+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. |
+---------------------+----------------------------------------------------------+
.. image:: ./images/tpers.png
:scale: 50%
:alt: Tilted perspective
Tilted Perspective is similar to :ref:`nsper` (``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.
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