Volume 1 - The Atmospheric Studies Group at TRC

data files are one-degree sheets, and are named by the latitude and longitude of the
southeast corner of the sheet. The land use data files are sheets covering one degree
latitude and two degrees longitude. They are also named by the latitude and
longitude of the southeast corner of the sheet.
Extracting Data Subsets
The SUBDOMN utility must be run via the CALPUFF PROfessional (CALPRO)
GUI to prepare the surface and precipitation data files for CALMET, and ozone data
file for CALPUFF. Those stations to be extracted for a simulation are selected by
providing a latitude and longitude range appropriate to the CALMET domain. The
output files produced are CALMET/CALPUFF-ready. In addition, SUBDOMN
requires the map projection and the datum for the CALMET grid coordinates so that
it can prepare the station information needed for the CALMET control file. The
station coordinates in the dataset files are transformed to the CALMET coordinates,
and the full control file section for each (Input Group 7 for surface stations, Input
Group 9 for precipitation stations) is written to a list file. Surface station information
is written to SURF_STN.LST; precipitation station information is written to
PRECIP_STN.LST. An editor can be used to cut-and-paste the control file sections
from these files into the CALMET control file. Station information for the ozone
stations, transformed to the CALMET/CALPUFF coordinate system, is included in
the OZONE.DAT file for CALPUFF.
Two screens in the GUI are filled in for SUBDOMN. If the “shared information” has
been identified and saved in a file, the “shared information” is automatically updated
into the first screen, “Grid setting” (Figure 5-7). Otherwise, all the fields in the first
screen can be typed in using the CALMET application parameters. The second
screen, “Inputs/Outputs & Run”, is shown in Figure 5-8. For each of the three data
sets (surface, precipitation and ozone), a “box” that covers entire modeling domain
and an appropriate buffer zone around the modeling domain (order of magnitude of
100 km) should be defined. Minimum and maximum longitude and latitude defining
that box are the inputs to the second screen, along with the names of the standard data
files and the data output files.
The RUCDECODE utility must be run in a command-window to prepare the
3D.DAT file(s) of RUC data for CALMET. Its control file is configured to identify a
domain and a time period to extract. Each application of RUCDECODE requires its
own control file and the user must manage the names of the input and output files
created. Multiple RUC 3D.DAT files may be needed if the space-time domain of an
application produces a 3D.DAT file that exceeds the limits imposed by the operating
system. An example control file is listed in Table 5-6. The RUCDECODE program
is contained on the DVD with the data files.
Final Report Vol.1 94