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[fitsbits] HPX paper published
Greetings, This is a straight cut-and-paste from my web page (without URLs): ------------------------------------------------------------------------ "Mapping on the HEALPix grid", Calabretta & Roukema, as submitted to Monthly Notices of the Royal Astronomical Society (MNRAS) on 2007/06/26, introduces the HPX projection type. (PDF version) The official refereed version of the paper, which will be published as MNRAS 381 865, can be accessed from Blackwell Publishing now (2007/10/01) via their online early system. The paper mentions "a utility program that converts 1D HEALPix pixelization data stored in a variety of forms in FITS, including ring or nested organization in a binary table extension, into a 2D primary image array with HPX coordinate representation". This utility, HPXcvt, will be made available in WCSLIB 4.3. However, as that has been delayed, the HPXcvt.c code is being released separately, with an example of its application (13MiB bzip'd) to the WMAP 3-year Internal Linear Combination map. Compilation is straightforward, it does not depend on WCSLIB but does need to be linked to CFITSIO. Use 'HPXcvt --help' for usage instructions. ------------------------------------------------------------------------ Refer to http://www.atnf.csiro.au/people/mcalabre/WCS/index.html for the links, which include a copy of the paper (as submitted), the HPXcvt C code, and the WMAP ILC 3yr (v2) map. The salient point is that this map is produced *without interpolation* of the pixelization data. The final refereed version of the paper, available now from MNRAS online early, contains a section comparing the six Goldberg-Gott distortion indices of different members of the HEALPix class of projections. It also mentions a new pole-centred layout, referred to as the Butterfly projection (thanks to Stuart Lowe), which can be generated by HPXcvt. Therefore I recommend getting the online early version if you are subscribed. Mark Calabretta ATNF |
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