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| author | Kristian Evers <kristianevers@gmail.com> | 2016-12-17 21:44:18 +0100 |
|---|---|---|
| committer | Kristian Evers <kristianevers@gmail.com> | 2016-12-17 21:44:18 +0100 |
| commit | 8793a3869c030e8c91aeca6ed901d4419a787893 (patch) | |
| tree | 2ecf967e7775ef48af69bd03d9c2d107ade007b9 /docs | |
| parent | 3a7852b7a4adc905aa66351f779afbed6a6bf9aa (diff) | |
| download | PROJ-8793a3869c030e8c91aeca6ed901d4419a787893.tar.gz PROJ-8793a3869c030e8c91aeca6ed901d4419a787893.zip | |
Migrated rhealpix documentation from trac
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/source/projections/rhealpix.rst | 47 |
1 files changed, 44 insertions, 3 deletions
diff --git a/docs/source/projections/rhealpix.rst b/docs/source/projections/rhealpix.rst index c00c5166..1701558e 100644 --- a/docs/source/projections/rhealpix.rst +++ b/docs/source/projections/rhealpix.rst @@ -3,8 +3,49 @@ ******************************************************************************** rHEALPix ******************************************************************************** ++---------------------+----------------------------------------------------------+ +| **Classification** | Mixed | ++---------------------+----------------------------------------------------------+ +| **Available forms** | Forward and inverse, spherical and elliptical projection | ++---------------------+----------------------------------------------------------+ +| **Defined area** | Global | ++---------------------+----------------------------------------------------------+ +| **Implemented by** | Alex Raichev and Michael Speth | ++---------------------+----------------------------------------------------------+ +| **Options** | ++---------------------+----------------------------------------------------------+ +| `+north_square` | Position of the north polar square. | +| | Valid inputs are 0--3. Defaults to 0. | ++---------------------+----------------------------------------------------------+ +| `+south_square` | Position of the south polar square. | +| | Valid inputs are 0--3. Defaults to 0. | ++---------------------+----------------------------------------------------------+ -.. image:: ./images/rhealpix.png - :scale: 50% - :alt: rHEALPix +.. 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 noval 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 + + +Further reading +################################################################################ + +#. `NASA <http://healpix.jpl.nasa.gov/>`_ +#. `Wikipedia <https://en.wikipedia.org/wiki/HEALPix>`_ |