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3.4.1

Overview of Automated Methods using a DEM

Topographic, topologic, and hydrologic information from digital spatial

data can be extracted using a DEM describes the fundamental steps that accurately extract information.

and automated

methods.

must be taken

to process

This section a DEM and

Errors in DEMs are usually classified as sinks (pits) or peaks. Removing the pits is a standard operation when working with grid-based DEMs. A peak is less detrimental to the calculation of flow direction and is usually ignored. A DEM free of sinks is termed a depressionless DEM, and is the ideal input to calculate flow direction for watershed delineation.

The 8-Direction Pour Point Model as shown below in Figure 3.11 represents the direction water flows based on the neighboring cell with the lowest elevation. This method is the most widely used raster DEM processing method.

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