Add HealPix

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#202 opened on Jun 19, 2019 1 comment 0 reactions 0 assignees View on GitHub

enhancement help wanted

Description

https://en.wikipedia.org/wiki/HEALPix

Useful specification for 2-d histogram on the sphere, used widely for astrophysics and cosmology.

Example C++ implementation
https://sourceforge.net/projects/healpix/

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