Move 'Coordinate operations' to top level of docs [skip ci]

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diff --git a/docs/source/operations/projections/tpers.rst b/docs/source/operations/projections/tpers.rst
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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.