Identification Information
Spatial Reference Information
Distribution Information
Metadata Reference Information
DESCRIPTION
Abstract:
Digital elevation models (DEMs) are sampled arrays of surface elevations in
raster form. DEMs provide 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 is so named because the spacing between adjacent elevation
points are 30 arc-seconds of latitude and longitude.
The United States Geological Survey (USGS), National Aeronautics and Space
Administration (NASA), United Nations Environmental Programme (UNEP), U.S.
Agency for International Development (USAID), U.S. National Imagery Mapping
Agency (NIMA), Instituto Nacional de Estadia Geografia e Informatica (INEGI) of
Mexico, the Geographical Survey Institute (GSI) of Japan, the Scientific
Committee of Antarctic Research, and the New Zealand Manaaki Whenua - Landcare
Research Ltd. have provided funding and/or contributed data for this
30-arc-second elevation data project.
The Global 30-Arc-Second DEM project, in progress at the USGS EROS Data Center
(EDC), has produced 30-arc-second DEMs for the entire Earth's land surface
using eight data sources. Two distinct types of processing were employed in the
creation of the 30-arc-second DEM's, depending on the nature of the source data.
Existing DEMs such as DTED, required resampling only. Digitized cartographic
data, such as the DCW, demanded far more complex procedures.
The 30-arc-second data sets for Africa, Antarctica, Asia, Australia, Europe,
Greenland, North America, and South America are available from EDC, at no cost,
through an Internet anonymous File Transfer Protocol (FTP) account. In
addition, some of these data sets are available for distribution on compact
disc-read only memory CD-ROMs or on 8-mm digital cassettes.
The Global Land Information System (GLIS) is an interactive query system
providing information on a variety of data sets. GLIS also supports data
visualization and ordering services. For more information about GLIS, see
the GLIS Home Page (http://edcwww.cr.usgs.gov/glis/glis.html).
References:
Defense Mapping Agency, 1992, Development of the Digital Chart of the World:
Washington, D.C., U.S. Government Printing Office.
Defense Mapping Agency, 1986, Defense Mapping Agency product specification for
Digital Terrain Elevation Data (DTED) (2d ed.): St. Louis, Missouri, DMA
Aerospace Center [variously paged].
Defense Mapping Agency, Digitizing the Future, DMA Stock No. DDIPDIGITALPAC.
Environmental Systems Research Institute, 1991, Image integration--
incorporating images into your GIS, ARC/INFO user guide 6.0: Redlands,
California, Environmental Systems Research Institute, Inc. [variously paged].
Gesch, D.B., 1994, Identification of requirements and sources for global
digital topographic data, in Pecora 12 Symposium, Land Information from
Space-Based Systems, Sioux Falls, South Dakota, August 1993, Proceedings:
Bethesda, Maryland, American Society for Photogrammetry and Remote Sensing, p.
35-44.
Hutchinson, M.F., 1988, Calculation of hydrologically sound digital elevation
models, in Conference on Spatial Data Handling, 3rd, Columbus, Ohio, August
17-19, 1988, Proceedings: Third International Symposium Spatial Data Handling,
p. 117-133.
Hutchinson, M.F., 1989, A new method for gridding elevation and stream line data
with automatic removal of pits: Journal of Hydrology, v. 106, p. 211-232.
Hutchinson, M.F., 1991, A continental hydrological assessment of a new
grid-based digital elevation model of Australia: Hydrological Processes--An
International Journal, v. 5, p. 45-58.
SPATIAL DOMAIN
Bounding Coordinates:
West Bounding Coordinate:180W
East Bounding Coordinate:180E
South Bounding Coordinate:90S
North Bounding Coordinate:90N
KEYWORDS
Theme Keyword Thesaurus:
GCMD Parameter Keywords
Theme Keywords:
EARTH SCIENCE LAND SURFACE TOPOGRAPHY TERRAIN ELEVATION
CARTOGRAPHY
DCW
DEM
DIGITAL CHART OF THE WORLD
DIGITAL ELEVATION MODEL
DIGITAL MAPPING
DTED
EDC
EROS
GIS
MAPPING
NASA
SCAR
TOPOGRAPHY
UNEP
USGS
Place Keyword Thesaurus:
GCMD Location Keywords
Place Keywords:
GLOBAL
Contact Person:CUSTOMER_SERVICES
Contact Position:Technical Contact
Address:
Customer Services
U.S. Geological Survey
EROS Data Center
Sioux Falls, SD 57198
USA
Telephone:605-594-6151
Telephone:Fax 605-594-6589
Electronic Mail Address:INTERNET CUSTSERV@EDCSERVER1.CR.USGS.GOV
DISTRIBUTOR
Contact Organization Primary:EROS Earth Resources Observation Systems Data Center
Contact Person:CUSTOMER_SERVICES
Address:
Customer Services
U.S. Geological Survey
EROS Data Center
Sioux Falls, SD 57198
USA
Telephone:605-594-6151
Telephone:Fax 605-594-6589
Electronic Mail Address:INTERNET CUSTSERV@EDCSERVER1.CR.USGS.GOV
STANDARD ORDER PROCESS:
Online Transfer Option:
Network Address:
Network Resource Name: http://edcwww.cr.usgs.gov/eros-home.html
Offline Medium:Compact Disc-Read Only Memory (CD-ROM)
Offline Medium:Magnetic Tapes
METADATA DATE:1997-02-06
METADATA REVIEW DATE:1997-02-05
METADATA CONTACT
Contact Person:INFORMATION_SYSTEMS_MANAGEMENT
Address:
Information Systems Management
U.S. Geological Survey
EROS Data Center
Sioux Falls, SD 57198
USA
Telephone:605-594-6594
Telephone:Fax 605-594-6589
Electronic Mail Address:INTERNET CUSTSERV@EDCSERVER1.CR.USGS.GOV