Land Cover Data for Central Nebraska, 1993, Classified from Landsat-5 Thematic
Mapper Imagery -- Path-30, Row-32 Quadrilateral
By Ronald B. Zelt
ABSTRACT:
The Multi-Resolution Land Characterization (MRLC) consortium, made up of
representatives from five Federal programs, cooperated with the
U.S. Geological Survey (USGS) EROS Data Center to select, purchase,
pre-process, georeference, and analyze Landsat-5 Thematic Mapper (TM) imagery
for the conterminous U.S. TM data for the Path-30, Row-32 Quadrilateral
(roughly, lat 39°23' to 41°16'N, long 98°13' to 100°57'W.) were
collected on July 28, 1993, and processed according to MRLC protocols using an
unsupervised multi-variate cluster analysis to produce an image data set
consisting of 240 unlabeled categories or clusters. The clusters were
assigned to land-cover classes within a hierarchical classification system
developed for a USGS study of the Central Nebraska Basins (CNB). The Central
Nebraska Basins include the area drained by the Platte River between the
confluence of the North Platte and South Platte Rivers and the mouth of the
Platte River. The report contains interpreted image data for the 9,540-km²
part of the Path-30, Row-32 Quadrilateral that is within the Central Nebraska
Basins study unit. The data set includes a single-band, 16-bit raster array
in which each grid cell (pixel) contains a coded value that incorporates both
the original cluster number and a stratum number corresponding to one of the
environmental settings of Central Nebraska that were used to spatially
stratify the clusters. Data encoding the assigned land-cover class for each
grid-cell code are included in tabular form.
An assessment of the classification accuracy of the data suggests that
the area-weighted overall accuracy is about 85 percent. The area covered by
the data set is composed of about 46 percent grassland classes, about 33
percent cropland, about 16 percent general herbaceous vegetation, about 3
percent mixed vegetation (mainly in the Platte River valley), and lesser
amounts of other cover types.
DESCRIPTORS: Nebraska, Land Cover
CITATION:
R.B. Zelt, 2002, Land cover data for central Nebraska, 1993, Classified from Landsat-5
Thematic Mapper Imagery -- Path-30, Row-32 Quadrilateral: U.S. Geological Survey
Open-File Report 96-369, compact disc.
For additional information Copies of the report can be
write to: purchased from:
District Chief U.S. Geological Survey
U.S. Geological Survey, WRD Branch of Information Services
406 Federal Building Box 25286
100 Centennial Mall, North Denver Federal Center
Lincoln, Nebraska 68508 Denver, CO 80225-0286