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Table of Contents - The Atmospheric Studies Group at TRC

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Section 2: Geophysical D<strong>at</strong>a Processors<br />

Output D<strong>at</strong>um-Region<br />

-------------------<br />

<strong>The</strong> D<strong>at</strong>um-Region for the output coordin<strong>at</strong>es is identified by a character<br />

string. Many mapping products currently available use the model <strong>of</strong> the<br />

Earth known as the World Geodetic System 1984 (WGS-84). Other local<br />

models may be in use, and their selection in TERREL will make its output<br />

consistent with local mapping products. <strong>The</strong> list <strong>of</strong> D<strong>at</strong>um-Regions with<br />

<strong>of</strong>ficial transform<strong>at</strong>ion parameters is provided by the N<strong>at</strong>ional Imagery and<br />

and Mapping Agency (NIMA).<br />

D<strong>at</strong>um-region for output coordin<strong>at</strong>es<br />

(DATUM) Default: WGS-84 ! DATUM = NAS-C !<br />

Grid<br />

----<br />

Reference coordin<strong>at</strong>es X,Y (km) assigned to the southwest corner<br />

<strong>of</strong> grid cell (1,1) (lower left corner <strong>of</strong> grid)<br />

(XREFKM) No Default ! XREFKM = 310.0 !<br />

<strong>Table</strong> 2-14 (continued)<br />

Sample MAKEGEO Control File<br />

(MAKEGEO.INP)<br />

(YREFKM) No Default ! YREFKM = 4820.0 !<br />

Cartesian grid definition<br />

No. X grid cells (NX) No default ! NX = 99 !<br />

No. Y grid cells (NY) No default ! NY = 99 !<br />

Grid Spacing (DGRIDKM) No default ! DGRIDKM = 1. !<br />

in kilometers<br />

!END!<br />

--------------------------------------------------------------------------------<br />

INPUT GROUP: 3 -- Output Land Use<br />

--------------<br />

-------------<br />

Subgroup (3a)<br />

-------------<br />

Number <strong>of</strong> output land use c<strong>at</strong>egories<br />

(NOUTCAT) Default: 14 ! NOUTCAT = 14 !<br />

Output land use c<strong>at</strong>egories assigned to w<strong>at</strong>er<br />

range from IWAT1 to IWAT2 (inclusive)<br />

(IWAT1) Default: 50 ! IWAT1 = 50 !<br />

2-56

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