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 3.4.1 Defining Networks of Gridded Receptors

     Two types of receptor networks are allowed by the ISC models.  A Cartesian grid network, defined through the GRIDCART keyword, includes an array of points identified by their x (east‑west) and y (north‑south) coordinates.  A polar network, defined by the GRIDPOLR keyword, is an array of points identified by direction and distance from a user‑defined origin.  Each of these keywords has a series of secondary keywords associated with it that are used to define the network, including any receptor elevations for elevated terrain and flagpole receptor heights.  The GRIDCART and GRIDPOLR  keywords can be thought of as "sub‑pathways," since their secondary keywords include a STArt and an END card to define the start and end of inputs for a particular network.

3.4.1.1 Cartesian Grid

     Cartesian grid receptor networks are defined by use of the GRIDCART keyword.  The GRIDCART keyword may be thought of as a "sub‑pathway," in that there are a series of secondary keywords that are used to define the start and the end of the inputs for a particular network, and to select the options for defining the receptor locations that make up the network.  The syntax and type of the GRIDCART keyword are summarized below:

Syntax:

RE GRIDCART Netid  STA

                   XYINC  Xinit   Xnum Xdelta  Yinit  Ynum  Ydelta

               or  XPNTS  Gridx1  Gridx2 Gridx3  ....   Gridxn, and

                   YPNTS  Gridy1  Gridy2 Gridy3  ....   Gridyn

                   ELEV   Row  Zelev1  Zelev2 Zelev3  ...  Zelevn

                   FLAG   Row  Zflag1  Zflag2 Zflag3  ...  Zflagn

                   END

Type:

Optional, Repeatable

 

 

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