Running the Terrain Analysis System
3.1		Background
3.2		The high points (.hpt) file
3.3		The saddles (.sad) file
3.4		The boundary vertices (.vrt) file
3.5		The stream lines (.stl) file
3.6		Building the .hpt, .sad, .stl and .vrt files automatically
3.7		The internal watersheds (.iws) file
3.8		Running Topog_Element

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