Why calculate slope and Aspect?. S tudy the flow of water I dentify the habitats of plants Identify potential sites for urban growth D rainage patterns on digital elevation models (DEMs) E nvironmental modeling. Slope.
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Study the flow of water
Identify the habitats of plants
Identify potential sites for urban growth
Drainage patterns on digital elevation models (DEMs)
tan(Slope(F)) = squrt((∆x)2+ (∆Y)2)
tan(Aspect(F)) = ∆x / ∆Y
Aspects indicate the steepest downslope direction
Aspects are measured clockwise
Eight Direction Pour Point Model
Flow Direction Grid
Cell size = 100 x 100 m
Each cell represents 10,000 m2 in area.
If delineate the streams for a 10,000 cell flow accumulation threshold, the minimum drainage area upstream will be:
10,000 x 10,000 = 100,000,000 m2 or 100 km2