Table of Contents - The Atmospheric Studies Group at TRC

Section 2: Geophysical Data Processors
section for details). Only data within the delimiter characters (!) are processed. The input data consist of a
leading delimiter followed by the variable name, equals sign, input value or values, and a terminating
delimiter (e.g., !XX = 12.5!). If the user wants to first compress the CTG Land Use data files (seldom
used), the compressing utility, CTGCOMP.INP may be created/edited directly using a conventional
editor, or it may be created/edited indirectly by means of the CALPro GUI. The PC-based, Windowscompatible
Graphical User Interface (GUI) developed for the geophysical preprocessors. An example of
the input file and a description of the input variables are shown in Tables 2-5 and 2-6, respectively.
Output: a list file (CTGPROC.LST), and a gridded land use data file. A sample list file is shown in Table
2-7.
2.2.4 Generic Land Use Data set – (non random Land Use categories mapped to USGS defaults)
A generic data set of the form; row number, Land Use category, latitude (negative for Southern
Hemisphere), longitude (negative for Western Hemisphere), can be created by the user if own Land Use
data is used, regardless of Land Use resolution. The program CTGPROC converts the latitude and
longitude information into grid kilometers and converts the Land Use categories detailed in Table 2-9 into
the equivalent USGS directly suitable for CALMET. A sample Generic Land Use data file is included in
Table 2-10 and the internal translation table that maps the non-random LU categories to the model default
USGS categories is shown in Table 2-11.
2.2.5 Generic Land Use Data set – (random Land Use categories not mapped to USGS defaults)
A generic data set of the form; Land Use category, longitude (negative for Western Hemisphere), latitude
(negative for Southern Hemisphere), can be created by the user if own Land Use data is used, regardless
of Land Use resolution. The program CTGPROC converts the latitude and longitude information into grid
kilometers and reads random Land Use categories to compute the fractional Land Use per cell. A sample
Generic Land Use data file is included in Table 2-13and file inputs described in Table 2-12.
The user is required to map the unique random Land Use categories to surface parameters, albedo,
roughness length, Bowen ratio, leaf area index and anthropogenic heat flux in MAKEGEO.
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