NYU Spatial Data Repository

Australasia: Drainage Directions, 30s resolution, 2008

Author(s):
Description:
This drainage direction map for Australasia defines the direction of flow from each cell in the conditioned digital elevation model to its steepest downslope neighbor. Values of flow direction vary from 1 to 128. There are eight valid output directions relating to the eight adjacent cells into which flow could travel. This approach is commonly referred to as an eight-direction (D8) flow model and follows an approach presented in Jenson and Domingue (1988). 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. This data is derived from elevation data of the Shuttle Radar Topography Mission (SRTM) at 30 arc-second resolution approx. 1km at the equator.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.
Publisher:
U.S. Geological Survey
Place(s):
Australasia
Subject(s):
Hydrology, Hydrography, Watersheds, Drainage, Rivers, Digital elevation models, Elevation, Inland Waters, and Imagery and Base Maps
Format(s):
ArcGRID
Year(s):
2008
Held by:
Stanford
Preservation record:
Variable Value
Click object on map to see data values