Note: You can view this post as a video: Moving topology edges.
In my previous post, I created a map topology on my Mammoth Cave dataset so I could simultaneously edit the features that share edges with other features. Now that I have a map topology, I need to use the topology editing tools to update some polygon borders in the land uses layer to be consistent with new imagery.
In an agricultural area near the national park, I noticed that the border between a crop field and a pasture needs to be adjusted to match the imagery. I can correct this by moving the edge, but I need to make sure that only this edge is repositioned and the others near it remain fixed. Normally, when edges are moved, all the adjacent edges stretch to stay connected. To avoid affecting the other edges, I first need to detach the edge and then can move and reconnect it at the new location.
To move the edge this way, I select it with the Topology Edit tool. As I rest the pointer over the edge’s endpoint, the icon changes to indicate that moving the edge will result in the endpoint being disconnected from the other shared edges. Because I need to move the endpoint slightly to the north so the fields match the shape in my imagery, I drag the endpoint and make sure it snaps.
By default, edges are moved proportionately so their general shapes are maintained. However, if I wanted portions of edges to move independently, I can right-click and turn off the setting for Stretch Topology Proportionately or change it on the Topology tab of the Editing Options dialog box.
After snapping the endpoint, the edge is reconnected to the other topology edges and the polygons correspond to the fields visible in the imagery.
