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U.S. Geological Survey Data Series

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

By James Falcone and Daniel Pearson

U.S. Geological Survey Data Series 221


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).

Table of Contents




Source Imagery

Land-Cover Processing

Imperviousness Processing

Data Format

Accuracy Assessment

Use of Data


References Cited

Data Files


Figure 1. 2001 land-cover for National Water-Quality Assessment Program, Effects of Urbanization on Stream Ecosystems (EUSE) study, Denver, Colorado.
Figure 2. 2001 land-cover for National Water-Quality Assessment Program, Effects of Urbanization on Stream Ecosystems (EUSE) study, Dallas-Fort Worth, Texas.
Figure 3. 2001 land-cover for National Water-Quality Assessment Program, Effects of Urbanization on Stream Ecosystems (EUSE) study, Milwaukee-Green Bay, Wisconsin.
Figure 4. Sample derived impervious surface data (a), compared to high-resolution orthoimagery (b), for the same area.
Figure 5. Landsat path/row footprints for Denver coverage.
Figure 6. Landsat path/row footprints for Dallas-Fort Worth coverage.
Figure 7. Landsat path/row footprints for Milwaukee-Green Bay coverage.
Figure 8. Sample 150-meter by 150-meter reference plot for accuracy assessment of percent impervious surfaces.



Table 1. Source imagery.
Table 2. Accuracy assessment results for impervious surface datasets.

This document is available in Portable Document Format (PDF):  (4.4 MB)

Data files

Brief Description

Denver 2001 land-cover file (4.8 MB)

Dallas-Fort Worth 2001 land-cover file (36.2 MB)

Milwaukee-Green Bay 2001 land-cover file (18.9 MB)

Denver 2001 imperviousness file (3.8 MB)

Dallas-Fort Worth 2001 imperviousness file (13.7 MB)

Milwaukee-Green Bay 2001 imperviousness file (8.8 MB)

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