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- Click on a single node from the interface to select this node, such as the confluence orange cycled on Figure 1 ( Node on catchment SC#10 in this example)
Figure 1. Selected the node to start combine sub-catchments function
- Right click on the interface’s empty space (that can keep the node selected) to pop up the Geographic Editor.
- Click on Combine Catchments >> At selected node boundaries to display the Windows windows of Combine Catchments as Figure 2. At the beginning, the contests under Catchment Group is empty.
Figure 2. Combine Catchments Windows Interface
- Click on the button of Find catchment groups at boundaries to display all sub-catchments upstream of the selected node (i.e. Node on catchment SC#10 in this example) in Catchment Groups (shown as Figure 3).
Figure 3. Combine Catchments at selected node with all found upstream sub-catchments
Some functions on Figure 3 are given below:
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- Manually select the sub-catchments to combine (use the Zoom option to Zoom in to the sub-catchments, and keep Selected Catchment in Layer Manager ticked) as Figure 4
Figure 4. Manually select sub-catchments for combining catchments
- The first catchment selected is deemed to be the Primary Catchment.
- Right click on the interface to pop up the Geographic Editor as Figure 5
Figure 5. start combine sub-catchments function from manually select sub-catchments
- Click on Combine Catchments >> From selected catchments to pop up the Windows of Combine Catchments as Figure 6.
Figure
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6. Combine Catchments Windows Interface for manually select sub-catchments
- The elements’ functions on Figure 4 6 can refer to those on Figure 3 and explained before
- Click on the Combine button on Figure 6 will lead a catchment combined from 4 catchments shown in Figure 7
Figure 7. The results catchment combined from manually selected sub-catchments
- Save the Source project to keep the combined results
Note that
- The change of combined sub-catchments is unable to reverse
- At the moment, the use needs to have a single outlet for all of the sub-catchments you are combining. The Source will relax this restriction in future versions.