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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 />

RLAT0 selected for convenience<br />

LCC : RLON0 identifies central (true N/S) meridian <strong>of</strong> projection<br />

RLAT0 selected for convenience<br />

PS : RLON0 identifies central (grid N/S) meridian <strong>of</strong> projection<br />

RLAT0 selected for convenience<br />

EM : RLON0 identifies central meridian <strong>of</strong> projection<br />

RLAT0 is REPLACED by 0.0N (Equ<strong>at</strong>or)<br />

LAZA: RLON0 identifies longitude <strong>of</strong> tangent-point <strong>of</strong> mapping plane<br />

RLAT0 identifies l<strong>at</strong>itude <strong>of</strong> tangent-point <strong>of</strong> mapping plane<br />

M<strong>at</strong>ching parallel(s) <strong>of</strong> l<strong>at</strong>itude (decimal degrees) for projection<br />

(Used only if PMAP= LCC or PS)<br />

(RLAT1) No Default ! RLAT1 = 30.0N !<br />

(RLAT2) No Default ! RLAT2 = 60.0N !<br />

LCC : Projection cone slices through Earth's surface <strong>at</strong> RLAT1 and RLAT2<br />

PS : Projection plane slices through Earth <strong>at</strong> RLAT1<br />

(RLAT2 is not used)<br />

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

Note: L<strong>at</strong>itudes and longitudes should be positive, and include a<br />

letter N,S,E, or W indic<strong>at</strong>ing north or south l<strong>at</strong>itude, and<br />

east or west longitude. For example,<br />

35.9 N L<strong>at</strong>itude = 35.9N<br />

118.7 E Longitude = 118.7E<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<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 />

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

<strong>Table</strong> 2-5 (continued)<br />

Sample CTGPROC Control File Inputs<br />

(CTGPROC.INP)<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 />

NIMA D<strong>at</strong>um-Regions (Document<strong>at</strong>ion Section)<br />

2-37

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