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 Nside 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

Version 3.31, 2017-01-06