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Routine prismtrs_trs_remap_conserv (grid1_size, grid2_size, grid1_corners, grid2_corners, id_src_lonlatz_size, id_index_size1, &
grid1_corner_lat, grid1_corner_lon, grid2_corner_lat, grid2_corner_lon, ida_nbsrccells_pertgtpt, ida_index_array, ida_srcepio_add, &
id_epio_id, id_interp_id, id_idim, num_wts, id_err)
Subroutine "prismtrs_remap_conserv" computes weights with a 2d conservative remapping method, derived from the SCRIP 1.4 library available from Los Alamos National Laboratory.

We go over the grid 1 (source) and then over the grid 2 (target).

- Grid1 : 'grid1 sweep'
id_index_size1=il_index_size1 = SUM(Drv_Epios(id_epio_id)%nbsrccells_pertgtpt) is defined in prismtrs_interp.

- Grid2 : 'grid2 sweep'