By David Crowther
Question:
I have features in two separate layers in QGIS which have shared nodes. Is it possible to reshape one feature and the other feature/s automatically update too?
Answer:
Yes, in QGIS you can use the SNAPPING options and the Topological Editing tool to move geometry which share Nodes.
Firstly, from the Snapping toolbar select the EYE icon and define the Snapping options. Here you can choose which layers can Snap, how they Snap (to a Vertex only, Segment only etc…) and the tolerance for snapping. In thus case we will ensure that we can Snap between the Utility and Shrewsbury Planning Apps layers.
Then from the Snapping toolbar choose the Enable Topological Editing tool.
Ensure that both the layers you wish to reshape are editable.
To reshape the features, from the Digitising toolbar choose the Vertex Tool – All Layers option.
Then simply select the shared node (vertex) and drag it to a new location.
When ready re-position the node at the required location and in this case all 3 geometries will be updated automatically using the Shared Node.