4.3.3. Files and Environment Variables
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4.3.3. Files and Environment Variables

4.3.3.1. Input Files
4.3.3.2. Input Environment Variables
4.3.3.3. Output Files

Figure 4.3. Elevpoint input and output files

Elevpoint input and output files

Figure 4.3, “Elevpoint input and output files” shows the input and output files for the Elevpoint program. The input files are the grid description file (GRIDDESC), an elevated source configuration file (PELVCONFIG), the point-source inventory file output from Smkinven (PNTS), and, if the PELVCONFIG file selects sources by emissions value or rank, either a list of hourly emissions files output by Temporal (PTMPLIST) or an individual hourly emissions file (PTMP).

Elevpoint outputs a log file (LOGFILE), an elevated point source identification file (PELV), an elevated and PinG source report (REPPELV), and a stack parameters file (STACK_GROUPS) if the PELVCONFIG file is configured to select stack groups.

4.3.3.1. Input Files

File Name Format Description
GRIDDESC ASCII Description of the modeling grid
PELVCONFIG ASCII Elevated source configuration file
PNTS SMOKE map Intermediate inventory file produced by Smkinven
PTMP (optional) ASCII Hourly emissions file produced by Temporal; needed only when PELVCONFIG specifies emissions as one of the selection or grouping criteria and not using the PTMPLIST file
PTMPLIST (optional) ASCII List of hourly emissions files produced by Temporal; needed only when PELVCONFIG specifies emissions as one of the selection or grouping criteria

4.3.3.2. Input Environment Variables

  • ELEV_WRITE_FAKE_SRC: [default: Y]

    Defines whether the program needs to add a fake source group or not when there is no an elevated source group to output.

    • Y: Add a fake source group when there is no an elevated source group to output

    • N: Do not add a fake source group.

  • ELEV_WRITE_LATLON: [default: Y]

    Defines whether write the latitude and longitude information of special elevated or PinG sources to the stack groups file Section 7.3.2, “STACK_GROUPS” for air quality models CMAQ, and UAM-style.

    • Y: Write the latitude and longitude information of elevated or PinG sources to the the stack group file.

    • N: Do not write the latitude and longitude information of elevated or PinG sources to the the stack group file.

    The ELEV_WRITE_LATLON can not be N, when processing for PinG sources, since CMAQ does need the latitude and longitude to be included.

  • G_RUNLEN: [default: 240000]

    Simulation length (HHMMSS)

  • G_STDATE: [default: 0]

    Starting date of simulation (YYYYDDD)

  • G_STTIME: [default: 0]

    Starting time of simulation (HHMMSS)

  • G_TSTEP: [default: 10000]

    Time step (HHMMSS), only 10000 is allowed

  • IOAPI_ISPH: [default: 19]

    Determines which USGS spheroid to use for grid-based calculations

    • 0: Clarke 1866
    • 1: Clarke 1880
    • 2: Bessel
    • 3: New International 1967
    • 4: International 1909
    • 5: WGS 72
    • 6: Everest
    • 7: WGS 66
    • 8: GRS 1980
    • 9: Airy
    • 10: Modified Everest
    • 11: Modified Airy
    • 12: WGS 84
    • 13: Southeast Asia
    • 14: Australian National
    • 15: Krassovsky
    • 16: Hough
    • 17: Mercury 1960
    • 18: Modified Mercury 1968
    • 19: Normal Sphere

    This environment variable can also be used to set custom spheroid representations. See the I/O API documentation for more information.

  • SMK_ELEV_METHOD: [default: 0]

    Defines the method to use in SMOKE for determining and processing elevated point sources. The setting chosen depends on the model output format needed from SMOKE. All PinG sources determined based on SMK_PING_METHOD will automatically be considered elevated sources (as defined specifically for the model for which you are creating emissions).

    • 0: Treat all sources as potentially elevated, and let the Laypoint program determine which sources are elevated and which are not. This approach is appropriate only for SMOKE output for the CMAQ model.

    • 1: Use the “Elevated” section of the PELVCONFIG configuration file to select specific sources. This approach can be used for any of the model output formats - CMAQ and UAM-style.

      For UAM-style emissions processing, this environment variable must be set to 1 and the PELVCONFIG file will be used to select specific sources. This method of processing is needed for UAM and CAMX because they require use of the cutoff method discussed earlier. In rare cases of a very small inventory, it might be acceptable to specify 0 for this setting in UAM-style emissions processing, provided that you are sure that treating all sources as elevated sources in UAM-style models is acceptable. We do not recommend such an approach for typical SMOKE applications for UAM-style models.

    • 2: Use the “Elevated” section of the PELVCONFIG configuration file to select specific sources. This approach can be used for in-line plume rise in CMAQ. Must set SMK_PING_METHOD = 0.

      For in-line plume rise processing in CMAQ, this environment variable must be set to 2 and the PELVCONFIG file will be used to select specific sources. To reduce the total number of plume rise calculations that would be done in the CMAQ in-line plume rise module, Elevpoint needs to group sources with nearly identical stack parameters. Elevpoint outputs stack group file that identifies elevated source locations and stack parameters for in-line plume rise calculation in CMAQ.

      When using Smkmerge for in-line plume rise processing, MRG_LAYERS_YN must set to N to create hourly speciated 2-D surface layer emissions file. If SMKMERGE_CUSTOM_OUTPUT is set to Y, the output file for the in-line emissions is called INLNST_L.

  • SMK_PING_METHOD: [default: 0]

    Defines the method to use in determining PinG point sources.

    • 0: No PinG sources

    • 1: Use PinG section of PELVCONFIG configuration file

    For all models that SMOKE supports use of PinG sources is optional. Some models may have limitations on the number of PinG sources supported, and you must make sure that these limitations are met; SMOKE does not automatically compare with these limitations, if any.

    For CMAQ, SMOKE will output a STACK_GROUPS file from the Elevpoint program and a PINGTS_[S|L] file from the Smkmerge program to support PinG. For UAM-style processing, SMOKE will flag PinG sources in the ASCII elevated file created by Smkmerge, and should be used with the SMK_ASCIIELEV_YN option set to Y to create this ASCII elevated file.

  • SMK_SOURCE: See description in Section 4.2.3.2, “Input Environment Variables”

4.3.3.3. Output Files

File Name Format Description
LOGFILE ASCII Log generated from executing Elevpoint
PELV ASCII Elevated point source identification file
REPPELV ASCII Reports the sources selected as elevated and PinG, plus other information about the sources, including why they were selected
STACK_GROUPS I/O API NetCDF PinG and/or elevated sources stack parameters file
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