WWF HydroSHEDS Hydrologically Conditioned DEM, 30 Arc-Seconds

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conditioned dem elevation geophysical hydrography hydrology hydrosheds srtm topography water wwf


HydroSHEDS is a mapping product that provides hydrographic information for regional and global-scale applications in a consistent format. It offers a suite of geo-referenced datasets (vector and raster) at various scales, including river networks, watershed boundaries, drainage directions, and flow accumulations. HydroSHEDS is based on elevation data obtained in 2000 by NASA's Shuttle Radar Topography Mission (SRTM).

This hydrologically conditioned elevation dataset is the result of an iterative conditioning and correction process. Note that the conditioning process alters the original DEM and may render it incorrect for applications other than deriving drainage directions. Endorheic basins (inland sinks) are ''seeded'' with a no-data cell at their lowest point in order to terminate the flow. Full details of the underlying digital elevation model are available in the HydroSHEDS website and documentation.

This dataset is at 30 arc-second resolution. The datasets available at 30 arc-seconds are the Hydrologically Conditioned DEM, Drainage (Flow) Direction, and Flow Accumulation.

Note that the quality of the HydroSHEDS data is significantly lower for regions above 60 degrees northern latitude as there is no underlying SRTM elevation data available and thus a coarser-resolution DEM was (HYDRO1k provided by USGS).

HydroSHEDS was developed by the World Wildlife Fund (WWF) Conservation Science Program in partnership with the U.S. Geological Survey, the International Centre for Tropical Agriculture, The Nature Conservancy, and the Center for Environmental Systems Research of the University of Kassel, Germany.


927.67 meters


Name Units Min Max Description
b1 m -415* 8247*


* estimated min or max value

Terms of Use

Terms of Use

HydroSHEDS data are free for non-commercial and commercial use. For more information, please refer to the License Agreement.


  • Lehner, B., Verdin, K., Jarvis, A. (2008): New global hydrography derived from spaceborne elevation data. Eos, Transactions, AGU, 89(10): 93-94.

Explore with Earth Engine

Code Editor (JavaScript)

var dataset = ee.Image('WWF/HydroSHEDS/30CONDEM');
var elevation = dataset.select('b1');
var elevationVis = {
  min: -50.0,
  max: 3000.0,
  gamma: 2.0,
Map.setCenter(-121.652, 38.022, 8);
Map.addLayer(elevation, elevationVis, 'Elevation');
Open in Code Editor