Table of Contents - The Atmospheric Studies Group at TRC

Section 1: Introduction
READ62 is a meteorological preprocessor which extracts and processes upper air wind and
temperature data from the standard NCDC TD-6201 data format or the NCDC CD-ROM FSL
rawinsonde data format.
SMERGE is a meteorological preprocessor that processes hourly surface observations from a
number of stations in NCDC CD-144 format, NCDC TD3505 format, NCDC TD9956 format,
ISHWO format, or generic comma delimited format file, or NCDC CD-ROM format, and
reformats the data into a single file with the data sorted by time rather than station. The CD-
ROM format contains data in either the Solar and Meteorological Surface Observational Network
(SAMSON) format or the Hourly U.S. Weather Observations (HUSWO) format.
PXTRACT is a meteorological preprocessor which extracts precipitation data for stations and a
time period of interest from a fixed length, formatted precipitation data file in NCDC TD-3240
format.
PMERGE is a meteorological preprocessor responsible for reformatting the precipitation data
files created by the PXTRACT program. PMERGE resolves "accumulation periods" into hourly
values and flags suspicious or missing data. The output file can be formatted or binary, which
can be directly input into the CALMET model, containing the precipitation data sorted by hour
rather than station.
TERREL is a terrain preprocessor which coordinates the allocation of terrain elevation data from
several digitized databases to a user-specified modeling grid.
CTGCOMP is a preprocessor used to compress the data file format of a USGS land use CTG
data file.
CTGPROC is a land use preprocessor which reads compressed CTG land use data files, USGS
Global Dataset format land use data files, USGS NLCD files, or two types of generic land use
format, and computes the fractional land use for each grid cell in the user-specified modeling
domain.
PRLND1 is a land use preprocessor which reads the ARM3 data base of land use data and
computes fractional land use for each grid cell in the user-specified modeling domain.
MAKEGEO is the final preprocessor which reads the fractional land use data, user inputs which
define land use category mapping, and values relating each of the surface parameters to land use,
and (optionally) the gridded terrain data file, and produces a GEO.DAT file ready for input to
CALMET.
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