dist2holes_nest

For a input binary mask in NESTED ordering, dist2holes_nest returns the angular distance (in radians) from each valid (1-valued) pixel to the closest invalid (0-valued) pixel. Distances are measured between pixel centers.

Location in HEALPix directory tree: src/f90/mod/mask_tools.F90 

FORMAT

call dist2holes_nest( nside, mask, distance )

ARGUMENTS

name & dimensionality	kind	in/out	description
nside	I4B	IN	the $N_{\mathrm{side}}$ value of the input mask.
mask(0:Npix-1)	I4B	IN	Input NESTED-ordered mask. Npix = 12*nside*nside
distance(0:Npix-1)	DP	OUT	Output NESTED-ordered angular-distance map

EXAMPLE:

use healpix_types
use healpix_modules
...
call dist2holes_nest(nside, mask, distance)

???

MODULES & ROUTINES

This section lists the modules and routines used by dist2holes_nest.

mask_tools

mask processing module (see related routines below)

RELATED ROUTINES

This section lists the routines related to dist2holes_nest

dist2holes_nest

angular distance to closest invalid pixel of the given mask

fill_holes_nest

turn to valid all pixels located in 'holes' containing fewer pixels than the given threshold

maskborder_nest

identify inner boundary pixels of 'holes' for given mask

size_holes_nest

returns size (in pixels) of holes found in input mask