Land-Cover and Imperviousness Data for Regional Areas near Denver, Colorado; Dallas-Fort Worth, Texas; and Milwaukee-Green Bay, Wisconsin - 2001

This report describes the processing and results of land-cover and impervious
surface derivation for parts of three metropolitan areas being studied as part
of the U.S. Geological Survey's (USGS) National Water-Quality Assessment
(NAWQA) Program Effects of Urbanization on Stream Ecosystems (EUSE). The data
were derived primarily from Landsat-7 Enhanced Thematic Mapper Plus (ETM+)
satellite imagery from the period 1999-2002, and are provided as 30-meter
resolution raster datasets. Data were produced to a standard consistent with
data being produced as part of the USGS National Land Cover Database 2001
(NLCD01) Program, and were derived in cooperation with, and assistance from,
NLCD01 personnel. The data were intended as surrogates for NLCD01 data because
of the EUSE Program's time-critical need for updated land-cover for parts of
the United States that would not be available in time from the NLCD01 Program.
Six datasets are described in this report: separate land-cover (15-class
categorical data) and imperviousness (0-100 percent continuous data) raster
datasets for parts of the general Denver, Colorado area (South Platte River
Basin), Dallas-Fort Worth, Texas area (Trinity River Basin), and
Milwaukee-Green Bay, Wisconsin area (Western Lake Michigan Drainages).

[Summary provided by the USGS.]