The setting-up of modeling domains with the HOPS software is accomplished with three separate packages.
The GRIDS package enables the user to design a model domain for the Harvard Ocean Prediction System (HOPS). In particular, the GRIDS package allows the user to
The GRIDS package, itself, is split-up into three programs:
| Input: | netCDF topography |
| ASCII parameter input file | |
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| Output: | netCDF domain descriptor (GRIDS file) |
| GMETA plot file | |
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Run Time: | A few minutes |
| Input: | GRIDS file |
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| ASCII parameter input file | |
| Output: | ASCII text |
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| Run Time: |
| Input: | 2 GRIDS files |
| Terminal input | |
| Output: | Overwrites one of the GRIDS files |
| Run Time: |
A more complete description of the GRIDS package in contained in the GRIDS User's Guide. A gzipped PostScript version of the guide (grids.ps.gz) is distributed with the GRIDS package.
The program PE_MASK appends/modifies the Land/Sea mask data to an existing GRIDS NetCDF file. The Land/Sea data is first computed from the raw bathymetry contained in the GRIDS NetCDF by specifying a transition isobath (said zero meters) between Land and Sea. The user then modifies the mask to remove problem spots (isolated ocean points, channels too narrow, etc).
The PE_MASK package is an interactive one. It includes several FORTRAN routines and MATLAB M-files; both the FORTRAN and MATLAB routines perform the same task. The MATLAB routines have the advantage that the mask data can be determined graphically and it is faster and not so tedious as the FORTRAN program. In addition, the MATLAB routines have had several niceties added to reduce the work involved. These features have not yet been ported to the FORTRAN version
If MATLAB is available, the MATLAB version of PE_mask is highly recommended over the FORTRAN version.
COND_TOPO is a series of MATLAB executable scripts designed to reduce the slope of the topography for use in the HOPS Primitive Equation model. These scripts are designed to modify only the topography in areas where the slope exceeds a user-specified value according a user-specified measure.
| Raw Western North Atlantic Topography | Conditioned Western North Atlantic Topography |
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Currently, COND_TOPO exists only in MATLAB form. This is due to a couple of reasons. The first is convenience. MATLAB was an easy environment to work in while we were still developing this utility. The second reason is that, on occasion, the conditioning can get really "lost". This means that the user must carefully inspect the results of conditioning before accepting them. MATLAB provides many tools for this.
A more complete description of COND_TOPO is provided in a couple of gzipped PostScript files:
| Directory | Files | Date (MM/DD/YYYY) |
Size Compressed (bytes) |
Size Uncompressed (bytes) |
Grids/ | Readme.grids | 01/16/2001 | |
14103 |
| grids.ps.gz | 01/16/2001 | 2422796 | 11270708 | |
| grids_7.2.tar.Z | 01/16/2001 | 212641 | 995840 | |
| Ex_grids_7.2.tar.gz | 01/16/2001 | 1064737 | 2673664 | |
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| PE_mask/ | Readme.mask | 08/03/2000 | |
16111 |
| pemask_4.1.tar.Z | 08/03/2000 | 103411 | 423424 | |
| Ex_mat_pemask_4.1.tar.gz | 08/03/2000 | 544669 | 1881088 | |
| Ex_for_pemask_4.1.tar.gz | 08/03/2000 | 464043 | 3356672 | |
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| Cond_Topo/ | Readme.cond_topo | 08/14/2001 | |
5360 |
| cond_topo_3.5.tar.Z | 08/14/2001 | 48648 | 179712 | |
| cond_topo.ps.gz | 08/14/2001 | 71007 | 188461 | |
| color_plate.ps.gz | 08/14/2001 | 162004 | 736342 | |
| Ex_cond_topo_3.5.tar.gz | 08/14/2001 | 386641 | 1577984 |
HOPS Compatible Topography Datasets
(pub/HOPS)
Directory
Files
Date
(MM/DD/YYYY)Size Compressed
(bytes)Size Uncompressed
(bytes)
Atlas/
Readme.atlas
11/18/1997
1631
etopo5.nc.gz
07/31/1995
11372838
18697556
gom_topo.nc.gz
11/13/1997
2779740
6372740