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USGS › Geography › Earth Resources Observation and Science (EROS) Center |
Global Land Cover Characterization (GLCC) is a series of global land cover classification datasets that are based primarily on the unsupervised classification of 1-km AVHRR (Advanced Very High Resolution Radiometer) 10-day NDVI (Normalized Difference Vegetation Index ) composites. The AVHRR source imagery dates from April 1992 through March 1993. Ancillary data sources included digital elevation data, ecoregions interpretation, and country- or regional-level vegetation and land cover maps.
The following classifications are included in the GLCC database:
All of the GLCC classifications consist of raster images that contain class number values for each pixel that correspond to the appropriate classification scheme legend. Legends for each of the derived datasets are listed in the Appendix of the GLCC README.
All GLCC data is available in two forms:
For every GLCC dataset, there are two versions available. Version 1 consists of GLCC data which has undergone complete accuracy assessment. Version 2 is updated GLCC which reflects additional data and sources, but accuracy assessment has not been completed.
All GLCC files are provided in flat headerless raster format. The data is distributed via FTP download only.
All GLCC datasets are available at no charge.
GLCC data may be downloaded at no cost from EROS Products (GLCC).
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