This tool will identify the hillslopes associated with a user-specified stream network. Hillslopes include the catchment areas draining to the left and right sides of each stream link in the network as well as the catchment areas draining to all channel heads. The user must specify the name of a streams raster, a flow pointer (flow direction) raster, and the output raster. The flow pointer and streams rasters should be generated using the D8 algorithm. Each hillslope is assigned a unique, positive identifier value. All grid cells in the output raster that coincide with a stream cell are assigned an idenifiter of zero, i.e. stream cells do not belong to any hillslope.

Hillslopes are conceptually similar to Sub-basins, except that sub-basins do not distinguish between the right-bank and left-bank catchment areas of stream links. The Sub-basins tool simply assigns a unique identifier to each stream link in a stream network.

NoData values in the input flow pointer raster are assigned NoData values in the output image. The output raster is of the float data type and categorical data scale.

See Also:


The following is an example of a Python script that uses this tool:

wd = pluginHost.getWorkingDirectory()
streamsFile = wd + "streams.dep"
pointerFile = wd + "D8 pointer.dep"
outputFile = wd + "output.dep"
args = [streamsFile, pointerFile, outputFile]
pluginHost.runPlugin("Hillslopes", args, False)

This is a Groovy script also using this tool:

def wd = pluginHost.getWorkingDirectory()
def streamsFile = wd + "streams.dep"
def pointerFile = wd + "D8 pointer.dep"
def outputFile = wd + "output.dep"
String[] args = [streamsFile, pointerFile, outputFile]
pluginHost.runPlugin("Hillslopes", args, false)