Usage Instruction
Watershed division is the process of dividing a watershed into several sub-basins. By calculating the watershed basins, larger watersheds can be obtained. However, in practical analysis, it may be necessary to divide the larger watershed into smaller watersheds (called sub-basins).
The first step in determining a watershed is to determine the catchment of that watershed, then the watershed partitioning also starts with determining the catchment of the sub-watershed. Unlike the calculation of watershed basins, the catchments of a sub-watershed can be located on the boundary of the raster or in the interior of the raster. Therefore, the catchment data for watershed segmentation can be either the raster data obtained from the previous calculation of catchment points, or a two-dimensional set of points representing the catchment points can be used to segment the watershed.
Parameter Instruction
| Parameter Name | Default Value | Parameter Definition | Parameter Type |
|---|---|---|---|
| Flow Data | Select the datasource and dataset where the flow raster is located. | DatasetGrid | |
| Catchment Point Data | Select the datasource and dataset where the catchment data is located. The catchment data can be either the calculated catchment raster data or the 2D point data set collected in the field. Note: The watershed extracted using watershed segmentation needs to correspond to the catchment. If the catchment volume of a part of the watershed does not reach the set threshold for catchment extraction, this part of the catchment will not be reflected in the results of the watershed segmentation. Therefore, the watershed segmentation result does not cover the whole DEM area. If you need the watershed result to cover the whole analysis area, you can use the function of calculating the watershed basin. | Dataset | |
| SQL Filter Expressions (Optional) |
Only valid for 2-dimensional catchment data. You can set the catchment points that participate in the watershed segmentation by setting a filter expression. | String | |
| Target Datasource | The specified datasource where the dataset of the stored results is located | Datasource | |
| Result Dataset Name | Specified result dataset name | String |
Output Result
| Parameter Name | Parameter Definition | Parameter Type |
|---|---|---|
| Basin map of the watershed at the resulting catchment | Basin map of the watershed at the resulting catchment | DatasetGrid |