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3.6 TERRAIN GRID PATHWAY INPUTS AND OPTIONS

 

     The Terrain Grid pathway contains keywords that define the input terrain grid data used in calculating dry depletion in elevated or complex terrain.  The TG pathway is an optional pathway for the ISC models.  If dry depletion is not being calculated, then the TG pathway may be omitted.  If dry depletion is being calculated and the TG pathway is omitted, then the model will linearly interpolate between the source base elevation and the receptor elevation when calculating dry depletion.

 

     The TG pathway includes two mandatory, non-repeatable keywords, and one optional keyword.  The INPUTFIL keyword identifies the name of the input file containing the TG data.  The syntax and type of the TG INPUTFIL keyword are summarized below:

 

Syntax:

TG INPUTFIL  Tgfile

Type:

Mandatory, Non-repeatable

 

where the Tgfile parameter is a character field of up to 40 characters that identifies the filename for the terrain grid data file.  The Tgfile parameter may include the complete DOS pathname for the file when running the model on an IBM-compatible PC.

 

     The TG LOCATION keyword is used to specify the location of the terrain grid data relative to the coordinate system used to define the source and receptor locations.   The terrain grid data file must be in UTM coordinates, while the source/receptor coordinates may be in a user specified coordinate system, such as plant coordinates.  The syntax and type of the TG LOCATION keyword are summarized below:

 

Syntax:

TG LOCATION  Xorig  Yorig  (Units)

Type:

Mandatory, Non-repeatable

 

where the Xorig and Yorig parameters are the values needed to transform the locations given in user-specified coordinates for sources and receptors to UTM coordinates.  The user coordinates are transformed by adding Xorig and Yorig to the x-coordinates and y-coordinates, respectively, of the sources and receptors.  The optional Units parameter is used to specify the units for the Xorig and Yorig parameters only.  The units may be specified as FEET, KM, or METERS.  The default units for Xorig and Yorig is in meters if the Units parameter is omitted.  For example, if the source and receptor coordinates in the runstream file are in UTM coordinates, then the TG LOCATION card should have a value of 0.0 for Xorig and Yorig, since no conversion is needed to match up the source/receptor locations to the terrain grid data.  If the source and receptor coordinates in the runstream file are in a different (non-UTM) coordinate system, such as a plant-based system, then the Xorig and Yorig parameters should be the UTM coordinates for the origin (x=0, y=0) of the source/receptor coordinate system.  The values of Xorig and Yorig are added to the source and receptor coordinates to convert them to UTM coordinates.  An example of the TG pathway is shown below:

 

TG STARTING

TG INPUTFIL  C:\TERRAIN\GRIDELEV.MSL

TG LOCATION  532.2  4391.74  KM

TG FINISHED

51

 

 

 

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