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.. _rhealpix:
********************************************************************************
rHEALPix
********************************************************************************
+---------------------+----------------------------------------------------------+
| **Classification** | Miscellaneous |
+---------------------+----------------------------------------------------------+
| **Available forms** | Forward and inverse, spherical and ellipsoidal |
+---------------------+----------------------------------------------------------+
| **Defined area** | Global |
+---------------------+----------------------------------------------------------+
| **Alias** | rhealpix |
+---------------------+----------------------------------------------------------+
| **Domain** | 2D |
+---------------------+----------------------------------------------------------+
| **Input type** | Geodetic coordinates |
+---------------------+----------------------------------------------------------+
| **Output type** | Projected coordinates |
+---------------------+----------------------------------------------------------+
.. image:: ../../../images/rhealpix.png
:scale: 75%
:alt: rHEALPix
rHEALPix is a projection based on the HEALPix projection. The implementation of
rHEALPix uses the HEALPix projection. The rHEALPix combines the peaks of the
HEALPix into a square. The square's position can be translated and rotated across
the x-axis which is a novel approach for the rHEALPix projection. The initial
intention of using rHEALPix in the Spatial Computation Engine Science Collaboration
Environment (SCENZGrid).
Usage
###############################################################################
To run a rHEALPix projection on a WGS84 ellipsoidal model, use the following
command::
proj +proj=rhealpix -f '%.2f' +ellps=WGS84 +south_square=0 +north_square=2 -E << EOF
> 55 12
> EOF
55 12 6115727.86 1553840.13
Parameters
################################################################################
.. note:: All parameters for the projection are optional.
.. option:: +north_square
Position of the north polar square. Valid inputs are 0--3.
*Defaults to 0.0.*
.. option:: +south_square
Position of the south polar square. Valid inputs are 0--3.
*Defaults to 0.0.*
.. include:: ../options/lon_0.rst
.. include:: ../options/ellps.rst
.. include:: ../options/x_0.rst
.. include:: ../options/y_0.rst
Further reading
################################################################################
#. `NASA <http://healpix.jpl.nasa.gov/>`_
#. `Wikipedia <https://en.wikipedia.org/wiki/HEALPix>`_
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