HEALPix is a set of scientific tools implementing the Hierarchical Equal
Area isoLatitude Pixelation of a sphere. As suggested in the name,
this pixelation produces a subdivision of a spherical surface in which
each pixel covers the same surface area as every other pixel. HEALPix
provides various programs and libraries in C, C++, Fortran and
GDL/IDL which facilitate discretization of functions on a sphere at
sufficiently high resolution. It is the state-of-the-art program used
in Astronomy and Cosmology to deal with massive full-sky data sets.