npix2nside

Function to provide the resolution parameter N_side corresponding to the number of pixels N_pix over the full sky.

Location in HEALPix directory tree: src/C/subs/chealpix.c 

FORMAT

long npix2nside(const long npix)

ARGUMENTS

name&dimensionality	kind	in/out	description
npix	long	IN	the number of pixels Npix of the map .
npix2nside	long	OUT	returns the Nside parameter of the map such that Npix=12Nside2.

EXAMPLE:

nside= npix2nside(786432);

Returns the resolution parameter (256) corresponding to 786432 HEALPix pixels.

RELATED ROUTINES

This section lists the routines related to npix2nside

ang2vec

converts $(\theta,\phi)$ spherical coordinates into (x,y,z) cartesian coordinates.

vec2ang

converts (x,y,z) cartesian coordinates into $(\theta,\phi)$ spherical coordinates.

nside2npix

converts number of full sky pixels N_pix into resolution parameter N_side