function local_map_size( pixelization, first_ring, last_ring)
Purpose:
For a given pixelization, pixelization, it computes a number of pixels corresponding to the ring interval [first_ring;
last_ring] (both included). All pixels from the (at least partially) observed rings and from both hemispheres
are included.
To be called by each proc with its specific input.
Parameters:
Input:
-
pixelization- [pixeltype], an S2HAT structure defining the employed pixelization scheme;
-
first_ring- [integer(4b)], a number of the first (iso-latitude) ring of the Northern Hemisphere;
-
last_ring- [integer(4b)], a number of the last (iso-latitude) ring of the Northern Hemishpere (or the equator).
Output:
-
returns a number of pixels [integer(4b)] contained in the submap defined by the rings first_ring and last_ring
on the Northern hemisphere and corresponding rings of the Southern hemisphere. All pixels of every ring of which at least one pixel
is observed are included.
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