Feature Description
Watershed segmentation is the process of dividing a watershed into several sub-watersheds. By calculating drainage basins, larger watersheds can be obtained. However, in practical analysis, it may be necessary to divide larger watersheds into smaller sub-watersheds.
The first step in determining a watershed is identifying its pour point. Similarly, watershed segmentation primarily requires determining the pour points of sub-watersheds. Unlike drainage basin calculation, pour points of sub-watersheds can be located either on raster boundaries or within raster interiors. Therefore, pour point data for watershed segmentation can use either pre-calculated pour point raster data or 2D point collections representing pour points to segment watersheds.
Parameter Description
| Parameter | Default Value | Description | Type |
|---|---|---|---|
| Flow Direction Data | Select the datasource and dataset of the flow direction raster. | DatasetGrid | |
| Pour Point Data | Select the datasource and dataset of pour point data. The pour point data can be either pre-calculated pour point raster data or field-collected 2D point datasets. Note: The extracted sub-watersheds correspond to pour points. If some watersheds do not meet the threshold for pour point extraction, these drainage areas will not appear in the segmentation results. Thus, watershed segmentation results may not fully cover the entire DEM extent. Use drainage basin calculation if full coverage is required. |
Dataset | |
| SQL Filter Expression (Optional) |
Applies only to 2D pour point data. Set filter expressions to specify pour points participating in segmentation. | String | |
| Target Datasource | Specifies the datasource to store result datasets. | Datasource | |
| Result Dataset Name | Specifies the name of the result dataset. | String |
Output
| Parameter | Description | Type |
|---|---|---|
| Result Drainage Basin of Pour Points | Result map of drainage basins for pour points | DatasetGrid |