This tool, located at the bottom of the Structures Administrator window, is used to update the data associated to the layers. You may need it in the following cases:
1. To recalculate perimeters and areas when you notice that the values given by the query are incorrect.
2. To update the layers data after defining base layers and/or static attributes.
When you click on this tool, a window showing all the layers of the current project will appear. Select the layers that you want to recalculate and click on Accept.