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Convert galprop skymaps to standard healpix

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A routine for converting GALPROP-generated HealPix skymaps to a compatible format which can be plotted by Aladin (v7), available from CDS at This allows free rotation of the sphere, avoiding the distortions of Aitoff and other projections often used. It is a very practical way to view and prepare skymap plots of GALPROP output.
GALPROP outputs a spectrum per HealPix pixel, while Aladin requires each energy to be stored as a column. A conversion is required to make GALPROP skymaps viewable in Aladin.
This program performs this conversion, outputs both the original energy bins and energy-integrated spectra, and in addition convolves with a user-defined Gaussian both in energy bins and energy-integrated. Also outputs the spherical harmonic decomposition as HealPix, per energy bin. There is also an option to divide by a second HealPix file, for example to give intensity if file 1 is counts and file 2 is exposure, to give intensity.
Now also converts back.

galprop_skymap_convert Web Site




  • The GALPROP cosmic-ray propagation software ( outputs skymaps in a format using HealPix, which however cannot be displayed with viewers like Aladin. This program converts to a standard HealPix format which can be viewed and used for other purposes.
  • Instructions for compilation and usage are given in the file header.
  • Bug reports, suggestions for enhancements etc, are welcome.
  • New 27 Sept 2013: program to convert back to the old format as well. Useful for analysis software which uses the vector format while Fermi Science Tools produces the column format. See This also adds the energy information in a FITS extension, unlike
  • can convert both ways, the format is automatically detected and converted to the other format.
  • see also
  • New 21 Nov 2013: v2: more robust detection of input file format
  • New 27 Nov 2013: v3 correct input units for Fermi Science Tools counts files
  • New 04 Dec 2013: for both files: instructions for use with HEALPix v3.11 (as well as v2.20a)
  • For GALPROP updates see
  • GALPLOT plotting package requires these conversions when using Fermi data processed with Fermi Science Tools


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