Program SELMRG2D

Usage

    setenv  <infile1>    <path name>
    ...
    setenv  <infileN>    <path name>
    setenv  <outfile>    <path name>
    selmrg2d (and answer the prompts)

where infile1, ...,infileN, and outfile are the logical names of the input and output files.

Summary

The SELMRG2D program extracts multiple user-selected 2D variable/layer combinations for a specified time step sequence from multiple gridded I/O API files, infile1, ..., infileN and writes them to a different single-layer gridded I/O API file, outfile. The input files infile1, ..., infileN must all have the same horizontal grid structure, althought they are not required to have the same vertical grid structure (or be single-layered, having no vertical structure at all).

The normal use of SELMRG2D is to script the production of files for input to 2-D graphics/visualization programs, e.g., for the automated graphical web-page-delivered analyses needed in various real-time meteorology/air quality forecasting projects such as NCSC's Numerical Air Quality Prediction Project.

Requires Fortran-90 for compilation.

Before you run the program, you need to assign logical names to the physical file names of the input and output files according to Models-3 conventions, using the operation

    "setenv <lname> <pname>"

The program will prompt you for

the logical names you have chosen for the input files,
for each input file, repeatedly for
- the variable to select,
- if the input file has multiple layers, the layer to select, and
- the output name to use for this variable/layer
the logical name for the output file, and
the time step sequence to process:
- starting date, format YYYYDDD,
- starting date, format HHMMSS, and
- the run duration, format HHMMSS.

The prompts have default responses indicated in square brackets [LIKE THIS], which can be accepted by hitting <RETURN>. The specification of starting date and time, target date and time, and number of time step records for the run follow Models-3 date and time conventions.

If you want to run this program in batch mode (from a script), the recommended way to develop the script is to run the program once interactively noting the pattern of responses to prompts which generate the particular analysis you want. The pattern of responses then becomes either a command-input file which you may redirect into the program in the script, or may become a "here-document" fed into the execution by the script.

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