Example 3 – Repairing a gap between polygons

In this example, we will continue to work with the parcel.shp polygon layer. Here, we will focus on the first gap error listed in the Topology Checker error list that has a feature ID of 0. The steps to repair this are as follows:

1. Ensure that editing is still toggled on for the parcels layer.

2. Double-click on the error in the table so that QGIS will zoom to the area. You will see a small horizontal gap between two parcel polygons, as shown in the following diagram:

3. The same editing parameters that were set in Example 2 will be used here.
4. Zoom in a bit closer to the problem area.
5. Select the parcel to the north using the select feature by the rectangle tool.
6. Using the vertex tool, select the lower-left vertex and drag it to snap with the other two parcels and close the gap:

7. Verify that the...