18 February 2011

HYDRO 1k Elevation FREE GLOBAL Datasets

HYDRO1k provides a suite of “FREE” geo-referenced data sets, both raster and vector, which will be of value for all users who need to organize, evaluate, or process hydrologic information on a continental scale.

HYDRO1k is a geographic database developed to provide comprehensive and consistent global coverage of topographically derived data sets, including streams, drainage basins and ancillary layers derived from the USGS’ 30 arc-second digital elevation model of the world.

The HYDRO1k data sets are being developed on a continent by continent basis, for all landmasses of the globe with the exception of Antarctica and Greenland. The HYDRO1k package provides, for each continent, a suite of six raster and two vector data sets. These data sets cover many of the common derivative products used in hydrologic analysis. The raster data sets are the hydrologically correct DEM, derived flow directions, flow accumulations, slope, aspect, and a compound topographic (wetness) index. The derived streamlines and basins are distributed as vector data sets.

Datasets are available for Free direct downloads as:
  • Africa
  • Asia
  • Australasia
  • Europe
  • North America
  • South America
And Categorized as:
  • Aspect
  • Compound
  • Topographic Index
  • Drainage Basins
  • Elevation Data
  • Flow Accumulation
  • Flow Direction
  • Slope
  • Streams
Below; A Typical Sample Data Download page:
This work was conducted by the U.S. Geological Survey in cooperation with UNEP/GRID Sioux Falls. Additional funding was provided by the Brazilian Water Resources Secretariat and the Food and Agriculture Organization/Inland Water Resources and Aquaculture Service.

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