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.. _eck4:
********************************************************************************
Eckert IV
********************************************************************************
.. image:: ./images/eck4.png
:scale: 50%
:alt: Eckert IV
.. math::
x = \lambda(1+cos\phi) / \sqrt{ 2 + \pi }
.. math::
y = 2 \phi / \sqrt { 2 + \pi }
Parameters
################################################################################
.. note:: All parameters are optional for the Eckert IV projection.
.. include:: ../options/lon_0.rst
.. include:: ../options/R.rst
.. include:: ../options/x_0.rst
.. include:: ../options/y_0.rst
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