Code components

Classes:

• Healpix_Base contains all functionality related to the HEALPix pixelisation which does not require actual map data.
• Healpix_Base2 is analogous to Healpix_Base, but allows for much higher resolutions.
• Healpix_Map is derived from Healpix_Base and implements additional functionality like change of the ordering scheme, up- and degrading and interpolation.
• Alm is used to store spherical harmonic coefficients.
• PowSpec is used to store coefficients.

Conversions between different data types:

• HEALPix maps <-> a_lm.
• power spectra <-> a_lm.

FITS I/O:

• for HEALPix Maps
• for spherical harmonic coefficients
• for power spectra