Hydrological Digital Elevation Model

Hydrologically Enforced Digital Elevation Model

The Hydrologically Enforced Digital Elevation Model (DEM-H) was derived from the SRTM data acquired by NASA. Area of Interest: Australia

Accurate DEMs are arguably one of the most important sources of spatial information used for managing river basins. Surface topography is a key factor in estimating catchment areas and surface water runoff. DEMs are therefore used extensively for watershed modelling and monitoring. DEMs also play an important role in risk assessment for natural disasters such as flooding and landslides.

A Digital Elevation Model (DEM) is a 3D digital representation of surface topography and can be created for any surface of the earth at varying levels of spatial details and accuracy, depending on available resources and user requirements. A distinction is often made between a Digital Surface Model (DSM), which represents the earth’s surface including all objects upon it, and a Digital Terrain Model (DTM), which represents the surface as it would be without any objects upon it. A wide variety of satellite sensors can be used for creating DEMs including optical sensors with stereo imaging capabilities.

 

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