[Location: Location_Category='GEOGRAPHIC REGION', Location_Type='GLOBAL']
Global 30-Arc-Second Elevation Data SetEntry ID: GTOPO30
Abstract: Digital elevation model (DEM) data are sampled arrays of surface elevations in raster form. A DEM provides elevation values in rows and columns, corresponding to a regular grid of points on the Earth's surface. The Global 30-Arc-Second Elevation Data Set (GTOPO30) is so named, because the spacing between adjacent elevation points is 30 arc-seconds (approximately 1 kilometer) of latitude and ... longitude.
Completed in 1997, the GTOPO30 data set was developed at the U.S. Geological Survey's EROS Data Center over a 3-year period with support from several national and international cooperators. Using eight data sources, a global 30-arc-second DEM resulted from this cooperative effort.
The GTOPO30 data are suitable for many regional and continental applications, including climate modeling; continental-scale land cover mapping; extraction of drainage features for hydrologic modeling; and geometric and atmospheric correction of medium- and coarse-resolution satellite image data.
Data Set Citation
Dataset Originator/Creator: U.S. Geological Survey
Dataset Title: Global 30-Arc-Second Elevation Data
Dataset Release Date: 1996
Dataset Release Place: Sioux Falls, South
Dataset Publisher: U.S. Geological Survey
Data Presentation Form: Model
Start Date: 1996-12-01
Latitude Resolution: 1 KM
Longitude Resolution: 1 KM
Horizontal Resolution Range: 1 km - < 10 km or approximately .01 degree - < .09 degree
LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > DIGITAL ELEVATION/TERRAIN MODEL (DEM)
LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > CONTOUR MAPS
LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES
LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > TOPOGRAPHICAL RELIEF MAPS
LAND SURFACE > TOPOGRAPHY > SURFACE ROUGHNESS
LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
ISO Topic Category
Quality The absolute vertical accuracy of GTOPO30 data varies by location according to
the source data. Generally, the areas derived from the raster source data have
higher accuracy than those data derived from the vector source data.
Access Constraints None
Use Constraints There is no guarantee of warranty concerning the accuracy of these data. Users should be aware that temporal changes may have occurred since the data was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data set is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data set, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer.
Data Set Progress
Distribution Media: Digital Download
Role: DIF AUTHOR
Phone: 605-594-6151, 800-252-4547
Email: lta at usgs.gov
LTA Customer Services U.S. Geological Survey EROS Center 47914 252nd Street
City: Sioux Falls
Province or State: SD
Postal Code: 57198-0001
Gesch, D.B., and Larson, K.S., in press, Techniques for development of global 1-kilometer digital elevation models, in Pecora Thirteen, Human Interactions with the Environment--Perspectives from Space, 13th, Sioux Falls, South Dakota, August 20-22, 1996, Proceedings: Bethesda, Maryland, American Society of Photogrammetry and Remote Sensing.
Verdin, K.L., and Jenson, S.K., 1996, Development of continental scale DEMs and extraction of hydrographic features, in National Center for Geographic
Information and Analysis (NCGIA) International Conference/Workshop on
Integrating GIS and Environmental Modeling, Third, Sante Fe, New Mexico,
January 21-25, 1996, Proceedings, CD-ROM, 1 disc. [Disc contains a Readme
Extended Metadata Properties
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Creation and Review Dates
Last DIF Revision Date: 2015-06-11