What is available?

The HEALPix-IDL tools are mostly designed to generate, visualize, filter and analyze sky maps; identify, query and process HEALPix pixels; and deal with angular spectral objects (such as power spectra or Spherical Harmonics coefficients), as detailed below. The full documentation is available online in IDL via healpix_doc

HEALPix maps related tools

• Visualization: gnomic, Mollweide, Cartesian, orthographic and azimuthal equatorial projections mollview, gnomview, cartview, orthview, azeqview (with interactive cursor: cartcursor, mollcursor, gnomcursor, orthcursor)
• Production of outlines for Earth continents, coastlines, countries and rivers outline_earth
• Color table creation: planck_colors
• Production of HEALPix maps in Google Sky and Dome Master format: hpx2gs, hpx2dm.
• Spherical Harmonics analysis and synthesis: ianafast, isynfast.
• Smoothing and filtering: ismoothing, median_filter, remove_dipole.
• Handling of quadrature weights: nside2npweights, unfold_weights.

• Pixel pro/down-grading and NESTED/RING pixel reordering: ud_grade, reorder.
• Mask processing: iprocess_mask
• Maps I/O: read_fits_cut4, read_fits_map, read_fits_partial, read_fits_s, read_tqu.
  write_fits_cut4, write_fits_map, write_fits_partial, write_fits_sb, write_tqu.
  getsize_fits, change_polcconv

HEALPix pixels related tools

• Coordinate tools: ang2vec, angulardistance, euler_matrix_new, rotate_coord, vec2ang
• Coordinates to pixel transforms, and back: nside2npix, npix2nside, ang2pix_*, pix2ang_*, pix2vec_*, vec2pix_*
• RING/NESTED transforms: nest2ring, ring2nest
• Unique Identifier to NESTED index, and back: uniq2nest, nest2uniq
• Neighbouring pixels: neighbours_nest, neighbours_ring
• Pixel query within a disc, polygon, strip or triangle: query_disc, query_polygon, query_strip, query_triangle.
• Template pixels: nside2ntemplates, same_shape_pixels_ring, same_shape_pixels_nest, template_pixel_ring, template_pixel_nest

Power spectrum, $a_{\ell m}$, beam and pixel window functions

• $B(\ell)$, $B(\theta)$ and pixel WF generation: gaussbeam, beam2bl, bl2beam, healpixwindow
• $C(\ell)$ binning: bin_llcl
• $a_{\ell m}$ handling tools: alm_i2t, alm_t2i, index2lm, lm2index, ialteralm
• $C(\ell)$, $B(\ell)$ and $a_{\ell m}$ I/O: fits2cl/cl2fits, bl2fits, fits2alm/alm2fits,

Other tools

• HEALPix variables and paths initialization: init_healpix
• online documentation: healpix_doc
• recursive help on IDL sub-structures: help_st