Subregion

Domain-independent source code for extraction of a subregion from an archive file or from a bathymetry or any hycom p-grid ".a" file.

HYCOM-tools/subregion/src

The mapping is via bilinear interpolation and the location of the source grid on the target grid is pre-calculated and stored in a "gmap" file.

Earlier versions of these programs were limited to target grids with the same grid resolution as the original, or which were finer than the original by an integer multiplier. These are replaced by the isubx_gmap program for setting up the gmap file for such cases.

All programs read regional.grid.b at run-time to get idm and jdm for the particular region being processed.

The Makefile is configured to key on ../../config/$(ARCH)_setup for machine-dependent definitions, see the Config Setup wiki page. When running on (say) a Linux PC, ARCH is "intel*" and an individual make command for gfortran might be:
make map ARCH=intelGF >& Make_map.log

Typically all executables are created just once by editing Make_all.src for the correct ARCH and then issuing the command csh Make_all.csh.