Computes the geometric difference between two Layers
The Clip Operation takes the features from a Clipping vector Layer and a Source vector Layer and uses them to compute the geometric difference between the Source and the Clipping layers, and stores the result on a third Layer.
It is possible to use the selected features, if a selection is set, on both the clipping and the source Layers to limit the scope of the operation.
Neither of the Layers used to compute the difference gets modified by any means, but a third Layer is created by default, or the user could select an existing Layer where to store the result.
We'll start this usage example by selecting a single feature from the municipalities layer which we'll use as the clipping mask against the voting areas layer.
Figure 1 shows the selected Feature, "Victoria" on the municipalities layer.
Figure 1. Define clip mask through BBox selection.
Now go to the Spatial Operations View, and select Clip from the Operation drop down.
The Clip Operation's specific input options will show up.
Now is time to indicate the operation's inputs, as shown in Figure 2:
Figure 3. Progress dialog.
Once the Operation finishes, if a new Layer were created to hold the result, it will be automatically added to the current Map.
Figure 4 shows the newly created Layer (Clip-1, in green) added to the map, with the Features resulting of applying the difference between the Source and Clipping Layers.
Figure 4. Result Layer