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Land Cover Data for Central Nebraska, 1993, Classified from Landsat-5 Thematic Mapper Imagery -- Path-30, Row-32 Quadrilateral

By Ronald B. Zelt
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

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.

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E-mail comments or questions to Ron Zelt, Central Nebraska Basins project chief

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