Creating buffers
The buffer spatial operation generates buffer zones (or zones of influence) around the geometry of a layer, considering a predefined distance.
If the geometry are polygons it is possible to ask for internal and/or external buffers.
It is possible to ask for several levels of buffers. Selecting a distance d and n levels will result in n buffers each at a distance d*(n-1).
As the buffers around different geometries might overlap, it is possible to request the dissolving of the boundaries inside the overlapping areas.
Click on PROCESSING → VECTOR PROCESSING → BUFFERS.
Select the input layer from the list.
Check in the Only Selected box if you wish to process only the objects that are selected in the map display.
Enter the buffer distance in meters.
Select the rule for polygons to create buffer inside, outside or both.
Select one type of
repository by clicking on the
button to save the output layer as a file or on the
button to save it in the database.
Enter the name of the output layer.
Click on the Boundaries between buffers tab.
Choose to dissolve or not the buffer boundaries. If the option is not to dissolve check in Copy input columns box to replicate columns to the output layer.
Click on the Multiple Levels tab.
Enter the number of buffer levels to be generated.
Click on the OK button.
In this example it was created two levels of 10 meters each outside of the polygons.