The data set consists of a southern African subset of the 1-km Global Land Cover Data Set Derived from AVHRR developed at the Laboratory for Global Remote Sensing Studies (LGRSS) at the University of Maryland. Both ASCII data and binary image files are available.
Over the past several years, researchers have increasingly turned to remotely sensed data to improve the accuracy of data sets that describe the geographic distribution of land cover at regional and global scales. To develop improved methodologies for global land cover classifications as well as to provide global land cover products for immediate use in global change research, researchers at the Laboratory for Global Remote Sensing Studies (LGRSS) at the University of Maryland have employed the NASA/NOAA Pathfinder Land (PAL) data set with a spatial resolution of 1 km. This data set has a record length of 14 years (1981-1994), providing the ability to test the stability of classification algorithms.
Furthermore, this data set includes red, infrared, and thermal bands in addition to the Normalized Difference Vegetation Index (NDVI). Inclusion of these additional bands improves discrimination between cover types. The project aim is to develop and validate global land cover data sets and to develop advanced methodologies for more realistically describing the vegetative land surface based on satellite data.
The 1-km global land cover product was created from 1992-93 LAC AVHRR data. The full 1-km global land cover product is available for download from the Global Land Cover Facility (GLCF)[http://www.landcover.org/] web site. Forty-one (41) metrics were developed to describe global vegetation phenology, and these data were used to make the 1-km land cover map. The final product contains 13 land cover classes.
More information can be found at: http://daac.ornl.gov/daacdata/safari2k/vegetation_wetlands/land_cover_data-1km/comp/glcf1km_readme.pdf.
Cite this data set as follows:
Hansen, M. C., R. S. DeFries, J. R. G. Townshend, and R. Sohlberg. 2002. SAFARI 2000 Land Cover from AVHRR, 1-km, 1992-1993 (Hansen et al.). Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/627.
Hansen, M. C., R. S. DeFries, J. R. G. Townshend, and R. Sohlberg. 1999. 1km Global Land Cover Data Set Derived from AVHRR. Global Land Cover Facility, University of Maryland Institute for Advanced Computer Studies, College Park, Maryland, U.S.A.
Information about the ASCII data and binary image file formats, land cover classes, and the procedure used to create the southern African subset are in the following file: http://daac.ornl.gov/daacdata/safari2k/vegetation_wetlands/land_cover_data-1km/comp/glcf1km_readme.pdf.
2002/3/1
2002/3/1
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