healpy.dist2holes

healpy.dist2holes(m, maxdist=3.141592653589793, hole_min_size=None, hole_min_surf_arcmin2=None)

Computes the distance (in radians) from pixel center to center of closest invalid pixel up to a maximal distance.

Parameters:

marray-like, shape (Npix,)

Input mask in RING ordering where True (or non-zero entries) mark masked pixels and False (or zero) mark valid pixels.

maxdistfloat, optional

The maximal distance in radians. Pixel farther from this distance are not taken into account (default: pi).

hole_min_sizeint, optional

Minimum connected hole size, expressed as a number of pixels, to retain. Holes smaller than this threshold are filled before the distance calculation. Defaults to None (no size-based filtering).

hole_min_surf_arcmin2float, optional

Minimum hole area, expressed in square arcminutes, to retain. Holes with a smaller area than this threshold are filled before the distance calculation. Defaults to None (no area-based filtering). The filtering uses HEALPix neighbour connectivity in RING ordering.

Returns:

distancesout map of distances (in radians) in RING scheme as numpy arrays