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Standard Slope Function

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  1. a b c d e f g h i Standard Slope Function

  2. Aspect – the steepest downslope direction

  3. a b c d e f g h i

  4. 80 80 74 74 63 63 69 69 67 67 56 56 60 60 52 52 48 48 Hydrologic Slope - Direction of Steepest Descent 30 30 Slope: ArcHydro Page 70

  5. 32 64 128 16 1 8 4 2 Eight Direction Pour Point Model ESRI Direction encoding ArcHydro Page 69

  6. The D Algorithm  If 1 is not fit within the triangle the angle is chosen along the steepest edge or diagonal resulting in a slope and direction equivalent to D8

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