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.. _chamb:
********************************************************************************
Chamberlin Trimetric
********************************************************************************
+---------------------+----------------------------------------------------------+
| **Classification** | Miscellaneous |
+---------------------+----------------------------------------------------------+
| **Available forms** | Forward spherical projection |
+---------------------+----------------------------------------------------------+
| **Defined area** | Global |
+---------------------+----------------------------------------------------------+
| **Alias** | chamb |
+---------------------+----------------------------------------------------------+
| **Domain** | 2D |
+---------------------+----------------------------------------------------------+
| **Input type** | Geodetic coordinates |
+---------------------+----------------------------------------------------------+
| **Output type** | Projected coordinates |
+---------------------+----------------------------------------------------------+
.. figure:: ./images/chamb.png
:width: 500 px
:align: center
:alt: Chamberlin Trimetric
proj-string: ``+proj=chamb +lat_1=10 +lon_1=30 +lon_2=40``
Parameters
################################################################################
Required
--------------------------------------------------------------------------------
.. note:: Control points should be oriented clockwise.
.. option:: +lat_1=<value>
Latitude of the first control point.
.. option:: +lon_1=<value>
Longitude of the first control point.
.. option:: +lat_2=<value>
Latitude of the second control point.
.. option:: +lon_2=<value>
Longitude of the second control point.
.. option:: +lat_3=<value>
Latitude of the third control point.
.. option:: +lon_3=<value>
Longitude of the third control point.
Optional
--------------------------------------------------------------------------------
.. include:: ../options/lon_0.rst
.. include:: ../options/R.rst
.. include:: ../options/x_0.rst
.. include:: ../options/y_0.rst
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