## Concentration / Display / Grid Values

A generic Postscript equivalent of the Windows-only concentration grid point data display program point is available through this menu. This particular program (gridplot) was designed to plot global sized concentration grids, although any sized grid may be displayed. There are no zoom options; concentration values over the entire grid will be shown using a color-fill in each grid cell according to its concentration value. The options available through the GUI are setting the input file, output file, lowest contour value, contour interval, species number, linear or logarithmic scaling, and the longitude offset. By default, each time period is output to a different file name, gridplot_{???}.ps, where the sequence number {???} is incremented by one for each time period. When called from the Global Grid menu tab, the default output file name is gemplot rather than gridplot.

Several other options are available through the command line, which may be needed if multiple levels have been written to the concentration output file. USAGE: gridplot -[options(default)]

-i[input file name (cdump.bin)]
-o[output name (plot)]
-l[lowest interval value (1.0E-36)]
-m[multi frames one file (0=no) 1=yes]
-d[delta interval value (1000.0)]
-s[species number to display: (1); 0-sum]
-h[height of level to display (m) (integer): (0 = dep)]
-a[scale: 0-linear, (1)-logarithmic]
-x[longitude offset (0), e.g., o--90: U.S. center; o-90: China center] : the longitude offset permits centering a global grid over either the eastern or western hemispheres
-f[(0), 1-ascii text output files for mapped values]

When called from the Global Grid menu tab, an additional feature is available through the Add Plume checkbox. In this case, the first plume model concentration grid (if more than one is defined) is added to the global model concentration grid as defined in this menu. The merged concentration file is called concadd.bin which is then displayed by gridplot. The two concentration files that are added must be identical in terms of levels and pollutants. However, the spatial grid characteristics may be different. The output grid always takes the grid dimensions of the second grid (-b). USAGE: concadd -[options(default)]

-i[input file name (cdump)]
-b[base file name to which input is added (gdump)]
-o[output file name with base format (concadd.bin)]