rHEALPix¶
Classification |
Miscellaneous |
Available forms |
Forward and inverse, spherical and elliptical projection |
Defined area |
Global |
Alias |
rhealpix |
Domain |
2D |
Input type |
Geodetic coordinates |
Output type |
Projected coordinates |
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.
-
+north_square¶ Position of the north polar square. Valid inputs are 0–3.
Defaults to 0.0.
-
+south_square¶ Position of the south polar square. Valid inputs are 0–3.
Defaults to 0.0.
-
+lon_0=<value>¶ Longitude of projection center.
Defaults to 0.0.
-
+x_0=<value>¶ False easting.
Defaults to 0.0.
-
+y_0=<value>¶ False northing.
Defaults to 0.0.