docs/source/operations/projections/eck4.rst


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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 }