zbounds2scan

subroutine zbounds2scan( zbounds, pixelization, scan)

Purpose:

Allocates and defines the S2HAT scandef structure, scan, corresponding to the observed (azimuthally symmetric) part of the sky defined by two cosines of the polar angles as stored in zbounds.
It can be called by all procs or only by one proc root and followed by a call to mpi_scanbcast. The structure scan has to be defined on all procs prior to a call to any of the transform.

Parameters:

input:

zbounds- [real(dp)], a two-component vector defining the iso-latitude sky cut to be performed on the map prior to computing a spherical transform (see Healpix manual);

pixelization- [pixeltype], a S2HAT structure defining all the properties of the pixelization;

output:

scan- [scandef], a S2HAT structure containing all the info about the cut-sky needed by the transforms.