Enhanced National Land Cover Data 1992 (NLCDe 92)

Metadata Updated: November 12, 2020

The enhanced National Land Cover Data 1992 ("NLCDe 92") served as the primary source for nationally consistent mapped land cover during the first decade of sampling for the National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey (USGS). This 30-meter (30-m) resolution digital map was developed by overlaying USGS's original satellite imagery-based 1992 National Land Cover Data ("NLCD 92") with selected classifications from USGS's aerial-photograph-based Land Use and Land Cover (LULC) data of the 1970s to mid-1980s. The LULC data set were combined with NLCD 92 because 1) some land land cover types important to NAWQA were not fully represented in the NLCD 92 and 2) the LULC data set is accepted as a better source of information for certain land cover types that are difficult to interpret from satellite imagery alone. Decision rules were used to modify the NLCD 92 data set based on the co-located LULC data on a cell-by-cell basis. The LULC classifications that were used to develop NLCDe 92 were "Residential," "Orchards, Groves, Vineyards, Nurseries, and Ornamental Horticultural Areas," and all 5 classifications of Tundra. Although NLCDe 92 is nominally referenced to 1992, it generally represents conditions in the early 1990s, the time period when the majority of the imagery for NLCD 92 was captured.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Date June 1, 2010
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) November 1, 2007 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from DOI Open Data

Graphic Preview

Illustration of the data set

Additional Metadata

Resource Type Dataset
Metadata Date June 1, 2010
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) November 1, 2007 (publication)
Responsible Party U.S. Geological Survey (Point of Contact)
Contact Email
Access Constraints Use Constraints: Because this data set is a combined product of USGS's NLCD 92 and USGS's LULC data set, users are cautioned to be aware of the differences in classification methodology, data compilation, resolution, and time period of data capture of the two data sources. Accuracy assessments of the NLCD 92 have been conducted on a region-by-region basis using a scientifically rigorous approach (Vogelmann and others, 2001). Because this data set is chiefly composed of the NLCD 92, please refer to the accuracy assessment available from http://landcover.usgs.gov/accuracy/index.php. In general, users should not rely on the accuracy of the land cover classification at the grid-cell level and instead are encouraged to use the NLCDe 92 in a spatially aggregated form. Acknowledgements of the U.S. Geological Survey would be appreciated for data sets and other products derived from the NLCDe 92., Access Constraints: none
Bbox East Long -65.143599
Bbox North Lat 51.857938
Bbox South Lat 22.736542
Bbox West Long -128.307900
Coupled Resource
Frequency Of Update notPlanned
Graphic Preview Description Illustration of the data set
Graphic Preview File https://water.usgs.gov/GIS/browse/nlcde92.jpg
Graphic Preview Type JPEG
Licence Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, this metadata file may include some vendor-specific terminology.
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 1986-01-01
Temporal Extent End 1995-01-01

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