.. _chamb:

********************************************************************************
Chamberlin Trimetric
********************************************************************************

.. 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
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Required
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.. 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
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.. include:: ../options/lon_0.rst

.. include:: ../options/R.rst

.. include:: ../options/x_0.rst

.. include:: ../options/y_0.rst