WWF HydroSHEDS Drainage Direction, 15 Arc-Seconds

WWF/HydroSHEDS/15DIR
Dataset Availability
2000-02-11T00:00:00 - 2000-02-22T00:00:00
Dataset Provider
Earth Engine Snippet
ee.Image("WWF/HydroSHEDS/15DIR")
Tags
geophysical drainage flow direction wwf hydrosheds water hydrology hydrography srtm

Description

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 drainage direction dataset defines the direction of flow from each cell in the conditioned DEM to its steepest down-slope neighbor. Values of drainage direction vary from 1 to 128. All final outlet cells to the ocean are flagged with a value of 0. All cells that mark the lowest point of an endorheic basin (inland sink) are flagged with a value of -1. The drainage direction values follow the convention adopted by ESRI's flow direction implementation: 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW, 64=N, 128=NE.

This dataset is at 15 arc-second resolution. The datasets available at 15 arc-seconds are the Hydrologically Conditioned DEM, Drainage (Flow) Direction, and Flow Accumulation.

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.

Bands

Resolution
15 arc seconds

Bands

Name Min Max Description
b1 0* 255*

Drainage direction posible values: 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW, 64=N, 128=NE; final outlet cells to the ocean are flagged with a value of 0 and cells that mark the lowest point of an endorheic basin (inland sink) are flagged with a value of 255 (original value of -1)

* 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.

Citations

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

Explore in Earth Engine

var dataset = ee.Image('WWF/HydroSHEDS/15DIR');
var drainageDirection = dataset.select('b1');
var drainageDirectionVis = {
  min: 1.0,
  max: 128.0,
  palette: [
    '000000', '023858', '006837', '1a9850', '66bd63', 'a6d96a', 'd9ef8b',
    'ffffbf', 'fee08b', 'fdae61', 'f46d43', 'd73027'
  ],
};
Map.setCenter(-121.652, 38.022, 8);
Map.addLayer(drainageDirection, drainageDirectionVis, 'Drainage Direction');

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