Calibrate channel-network extent.
Channel-initiation threshold calibrated to DEM.
Channel-initiation threshold calibrated to DEM.
Three
thresholds:
1)Specific
contributing area * slope squared (AS2); measure of erosive potential.
2)Plan curvature; measure of topographic convergence.
3)Minimum
flow length over which above two threshold musts be met.
Calibration
Area
Merged, sampled to 5-m
Thresholds use overlay of four data sets derived from the DEM:
1.Contributing area.
2.Contour
length crossed by flow exiting DEM cell.
3.Plan curvature.
4.Gradient.
High
Low