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HEALPix is an acronym for Hierarchical Equal Area isoLatitude Pixelisation of the sphere. The original motivation for devising HEALPix was one of necessity. Satellite missions to measure the CMB anisotropy will produce multifrequency data sets sufficient for the construction of full-sky maps of the microwave sky at an angular resolution of a few arcminutes. The principal requirements in construction of HEALPix were to create a mathematical structure which supports a suitable discretisation of functions on a sphere at sufficiently high resolution, and to facilitate fast and accurate statistical and astrophysical analysis of massive full-sky data sets.
Features include:
Programs for fast simulation and analysis of full-sky maps of CMB temperature and polarisation anisotropy up to sub-arcminute angular resolution (your computer's RAM permitting).
Routines to read and write the FITS formatted map data sets, and allowing the IDL-based display of your results.
Programs to search the maps for pixel neighbours and extrema of a random field.
Automated installation and build scripts.
Improved Fortan 90 programming standard.
Optimised P_lm recursion for better performance (about 20 percent faster).
Radek Stompor's P_lm recursion accurate for computations up to l = 10000.
A constrained realisation facility.
Improved IDL display and file handling routines.
An IDL toolkit for pixel manipulation and FITS file manipulation.
A Fortran90 MAP2GIF visualisation facility.
Improved documentation.
Author(s): K. M. Górski, E. Hivon, A.J. Banday and B. D. Wandelt. (healpix@eso.org) Version: 1.20 Filesize: 4.77 MB Language(s): English License type: Freely available for use under a "single user" license agreement.
