Skip to main content

DAAC Home > Get Data > Field Campaigns > SAFARI 2000 (S2K) > Data Set Documentation
SAFARI 2000 DIGITAL ELEVATION MODEL, 1-KM (GLOBE)
Get Data

SAFARI 2000 Digital Elevation Model, 1-km (GLOBE)


Summary:

This data set consists of a southern African subset of the Global Land One-Kilometer Base Elevation (GLOBE) digital elevation model (DEM) data in both ASCII GRID and binary image file formats.

The Global Land One-Kilometer Base Elevation (GLOBE) digital elevation model (DEM) is a global data set with horizontal grid spacing of 30 arc-seconds (0.008333... degrees) in latitude and longitude, resulting in dimensions of 21,600 rows and 43,200 columns. At the Equator a degree of latitude is about 111 kilometers. GLOBE has 120 values per degree, giving GLOBE slightly better than 1-km gridding at the Equator, with progressively finer gridding longitudinally toward the Poles.

The horizontal coordinate system is seconds of latitude and longitude referenced to World Geodetic System 84 (WGS84). The vertical units represent elevation in meters above Mean Sea Level. The elevation values range from -407 to 8,752 meters on land. In GLOBE Version 1.0, ocean areas have been masked as no data and have been assigned a value of -500. Because of the nature of the raster structure of the DEM, small islands in the ocean less than approximately 1 square kilometer (specifically, those that are not characterized by at least one 30 grid cell and/or do not have coastlines digitized into Digital Chart of the World or World Vector Shoreline) may not be represented.

More information about the procedure used to create the southern African subset is described in the accompanying file http://daac.ornl.gov/daacdata/safari2k/vegetation_wetlands/globe_dem/comp/so_africa_dem_readme.pdf.

Data Citation:

Cite this data set as follows (citation revised on February 5, 2003):

GLOBE Task Team and others (D. A. Hastings, P. K. Dunbar, G. M. Elphingstone, M. Bootz, H. Murakami, P. Holland, N. A. Bryant, T. L. Logan, J.-P. Muller, G. Schreier, and J. S. MacDonald), eds. 2002. SAFARI 2000 Digital Elevation Model, 1-km (GLOBE). 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/630.

References:

GLOBE Task Team and others (D. A. Hastings, P. K. Dunbar, G. M. Elphingstone, M. Bootz, H. Murakami, P. Holland, N. A. Bryant, T. L. Logan, J.-P. Muller, G. Schreier, and J. S. MacDonald), eds., 1998. The Global Land One-kilometer Base Elevation (GLOBE) Digital Elevation Model, Version 1.0. National Oceanic and Atmospheric Administration, National Geophysical Data Center, Boulder, Colorado, U.S.A.

Data Format:

Information about the data 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/globe_dem/comp/so_africa_dem_readme.pdf.

Document Information:

March 4, 2002 (citation revised on February 5, 2003)

Document Review Date:

March 4, 2002

Document Curator:

webmaster@www.daac.ornl.gov

Document URL:

http://daac.ornl.gov