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.. _chamb:

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

.. image:: ./images/chamb.png
   :scale: 50%
   :alt:   Chamberlin Trimetric

Parameters
################################################################################

Required
--------------------------------------------------------------------------------

.. 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