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HEALPix

HEALPix H=4, K=3 projection of the world. The lines on the map are a graticule of latitudes and longitudes.
The grid used by HEALPix and its subdivision of the sphere, in four different grid refinements. Notice the similarity between the coarsest grid and the rhombic dodecahedron.

HEALPix (sometimes written as Healpix), an acronym for Hierarchical Equal Area isoLatitude Pixelisation of a 2-sphere, is an algorithm for pixelisation of the 2-sphere based on subdivision of a distorted rhombic dodecahedron, and the associated class of map projections.[1] The pixelisation algorithm was devised in 1997 by Krzysztof M. Górski at the Theoretical Astrophysics Center in Copenhagen, Denmark,[2] and first published as a preprint in 1998.[3][4]

  1. ^ Cite error: The named reference calrouk was invoked but never defined (see the help page).
  2. ^ "HEALPix Background - History". healpix.jpl.nasa.gov. Retrieved 2019-06-08.
  3. ^ Cite error: The named reference GorskiHW1999 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference GorskiWHHB1999 was invoked but never defined (see the help page).
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