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     The syntax and type for the PLOTFILE keyword are summarized below:

 

Syntax:

OU PLOTFILE  Aveper  Grpid  Hivalu  Filnam (Funit), or

OU PLOTFILE  PERIOD  Grpid  Filnam  (Funit)

OU PLOTFILE  ANNUAL  Grpid  Filnam  (Funit)

Type:

Optional, Repeatable

where the Aveper parameter is the averaging period (e.g. 3, 8, 24 for 3, 8 and 24‑hour averages, MONTH for monthly averages, PERIOD for period averages, or ANNUAL for annual averages), Grpid is the source group ID for which the PLOTFILE option is selected, and Hivalu specifies which short term high values are to be output (FIRST for the first highest at each receptor, SECOND for the second highest at each receptor, etc.)  Note that the Hivalu parameter is not specified for PERIOD or ANNUAL averages, since there is only one period or annual average for each receptor.  The Filnam parameter is the name of the file where the PLOTFILE results are to be written.  The optional Funit parameter allows the user the option of specifying the Fortran logical file unit for the output file. The user‑specified file unit must be in the range of 20‑100, inclusive.  By specifying the same filename and unit for more than one PLOTFILE card, results for different source groups and/or averaging periods may be combined into a single file. If the Funit parameter is omitted, then the model will dynamically allocate a unique file unit for this file (see Section 3.9.2).

     The PLOTFILE card may be repeated for each combination of averaging period, source group, and high value, and a different filename should be used for each file.  The resulting formatted file includes several records with header information identifying the averaging period, source group and high value number of the results, and then a record for each receptor  which contains the x and y coordinates for the receptor location, the appropriate high value at that location, and the averaging period, source group and high value number.  The data are written to the file in the order of x‑coord, y‑coord, concentration (or deposition) so that the file can easily be imported into a graphics package designed to generate contour plots.  Many such programs will read the PLOTFILEs directly without any modification, ignoring the header records, and produce the desired plots.

     The following examples illustrate the use of the PLOTFILE option:

OU PLOTFILE  24  ALL    FIRST  PLT24ALL.FST

OU PLOTFILE  24  ALL    SECOND PLT24ALL.SEC

OU PLOTFILE  24  PSD      2ND  PLTPSD.OUT      75

OU PLOTFILE   3  PSD      2ND  PLTPSD.OUT      75

OU PLOTFILE   3  PLANT    1ST  C:\PLOTS\PLT3HR.FIL

OU PLOTFILE MONTH ALL   THIRD  PLTMONTH.OUT

OU PLOTFILE PERIOD ALL         PSTANN.PLT

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where the 3‑hour example illustrates the use of a DOS pathname for the PC, and the last example illustrates the use of monthly averages.  As illustrated by the second and third examples, the high value parameter may also be input as secondary keywords using the standard abbreviations of 1ST, 2ND, 3RD, . . .  10TH. The Filnam parameter may be up to 40 characters in length.  The use of separate files for each averaging period, source group, high value combination allows the user flexibility to select only those results that are needed for plotting from a particular run.

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