Sparse healpix maps and geometry library
copied from cf-staging / healsparseHealSparse is a sparse implementation of HEALPix in Python. HealSparse is a pure Python library that sits on top of numpy and healpy and is designed to avoid storing full sky maps in case of partial coverage, including easy reading of sub-maps. This reduces the overall memory footprint allowing maps to be rendered at arcsecond resolution while keeping the familiarity and power of healpy.
