Keywords
Theme:
Earth Science, Land Surface, Topography, Terrain Elevation, Digital Elevation Model, 3-arc-second DEM, Hydrosphere, Surface Water, Drainage, Hydropattern, Rivers, Streams, Watershed Characteristics, Cartography, Mapping, GIS, EDC, EROS, USGS
Place: Africa
Description
Abstract
HydroSHEDS (Hydrological data and maps based on SHuttle Elevation Derivatives at multiple Scales) provides hydrographic information in a consistent and comprehensive format for regional and global-scale applications. HydroSHEDS offers a suite of geo-referenced data sets (vector and raster), including stream networks, watershed boundaries, drainage directions, and ancillary data layers such as flow accumulations, distances, and river topology information. HydroSHEDS is derived from elevation data of the Shuttle Radar Topography Mission (SRTM) at 3 arc-second resolution. Available HydroSHEDS resolutions range from 3 arc-second (approx. 90 meters at the equator) to 5 minute (approx. 10 km at the equator) with seamless near-global extent.
Purpose
The goal of developing HydroSHEDS was to generate key data layers to support regional and global watershed analyses, hydrological modeling, and freshwater conservation planning at a quality, resolution and extent that had previously been unachievable.
Supplementary Information
For more information please refer to the HydroSHEDS Technical Documentation:
Lehner, B., Verdin, K., Jarvis, A. (2006): HydroSHEDS Technical Documentation. World Wildlife Fund US, Washington, DC. Available at http://hydrosheds.cr.usgs.gov.
Please also visit http://www.worldwildlife.org/hydrosheds and http://hydrosheds.cr.usgs.gov for information on data download and status reports.
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Status of the data
Complete
Data update frequency:
As needed
Time period for which the data is relevant
Date and time:
2006
Description:
publication date
Publication Information
Who created the data: World Wildlife Fund (WWF)
Date and time:
2006
Publisher and place:
U.S. Geological Survey, Sioux Falls, SD
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Data storage and access information
File name: af_bas_15s_beta
Location of the data:
http://hydrosheds.cr.usgs.gov
http://www.worldwildlife.org/hydrosheds
Data processing environment: Microsoft Windows XP Professional Version 2002 Service Pack 2; ESRI ArcView 3.2a; ESRI ArcGIS 8.2
Accessing the data
Size of the data: 69 MB
Data transfer size: zipped MB
Constraints on accessing and using the data
Access constraints:
None.
Use constraints:
Users may apply HydroSHEDS for non-commercial purposes. We kindly ask users to cite HydroSHEDS in any published material produced using this data. Any modification of the original data by users must be noted. The authors of HydroSHEDS may request reprints of publications and copies of derived materials. The user shall not reproduce, convert, (re)publish, (re)distribute, (re)broadcast, (re)transmit, sell, rent, lease, sublicense, lend, assign, time-share, or transfer, in whole or in part, or provide unlicensed third parties access to the data and related materials without explicit written permission from the authors. For more details see HydroSHEDS Technical Documentation.
Details about this document
Contents last updated: 20071001
Who completed this document
Bernhard Lehner
World Wildlife Fund US
mailing and physical address:
hydrosheds@wwfus.org
Standards used to create this document
Standard name: FGDC Content Standards for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention used in this document: local time
Horizontal coordinate system
Geographic coordinate system name: Geographic
Details
Geographic Coordinate System
Geographic Coordinate Units: Decimal degrees
Geodetic Model
Horizontal Datum Name: D_WGS_1984
Ellipsoid Name: WGS_1984
Semi-major Axis: 6378137.000000
Denominator of Flattening Ratio: 298.257224
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Bounding coordinates
Horizontal
In decimal degrees
West:
-19
East:
55
North:
38
South:
-35
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Spatial data description
Vector dataset information
Vector format: ESRI Shapefile