Catchment Extraction

The Catchment Extraction operation constructs catchments; a catchment will be calculated for each stream found in the output map of the Drainage Network Ordering operation.

As input is required:

• the output raster map of the Drainage Network Ordering operation,
• the output raster map of the Flow Direction operation.

As output a raster map, a polygon map and an attribute table are produced which all use the ID domain of the input Drainage Network Ordering map.

The attribute table contains information on each catchment, such as:

• area and perimeter of the catchment,
• total upstream area, i.e. the area of all catchments that drain into this catchment, etc.