# 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.

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