The Catchment Extraction operation can be directly executed by typing the following expression on the command line of the Main window:
|
OUTNAME |
= |
MapCatchmentExtraction(drainorder_rasmap, flowdir_rasmap) |
where:
|
OUTNAME |
is an output name that will be used for the output raster map, the output polygon map and the output attribute table. The output maps will contain all sub-catchments (one for each stream); the attribute table will contain information on each sub-catchment. |
|
MapCatchmentExtraction |
|
|
is the command to start the Catchment Extraction operation. |
|
|
drainorder_rasmap |
is a raster map that is the outcome of the Drainage Network Ordering operation, i.e. a raster map with an Identifier domain. |
|
flowdir_rasmap |
is a raster that is the outcome of the Flow Direction operation, i.e. a raster map with system domain FlowDirection. |
When the definition symbol = is used, a dependent output map is created; when the assignment symbol := is used, the dependency link is immediately broken after the output map has been calculated.
The output maps and the output attribute table use the ID domain of the input drainorder_rasmap.
See also:
Catchment extraction : functionality