Trimming
Feature Description
The trimming tool is used to trim shared topology boundaries. By drawing a line that crosses existing topology edges, the original boundary can be replaced. If the boundary involves overlapping topology edges in multiple layers, the related layers will be updated synchronously. This tool is suitable for local modifications of complex lines and polygon objects, such as updating earth polygons or boundaries based on the latest imagery data during the vectorization of remote sensing imagery.
Function Entry
- Edit Data tab -> Feature Editing group -> Topology editing drop-down menu -> Trimming.
Operation Steps
- Enable the editing state of related layers in the Layer Manager, then in the Edit Data tab -> Object Edit group -> Topology editing drop-down menu, turn on Topology edit switches. After turning it on, the topology map will be displayed overlapped on the map.
- Select one or more topology edges on the map, then in the Edit Data tab -> Object Edit group -> Topology editing drop-down menu click the Trimming button.
- When the mouse cursor in the map changes to a crosshair, and prompts: draw a line that has at least two or more intersections with the currently selected object. At this point, you can start drawing the curve. Right-click to end drawing and complete the trimming.
Notes:- If multiple topology edges are selected simultaneously, the drawn trimming line must have at least two intersections with each selected edge for the trimming to succeed.
- During trimming, if you need to exclude some shared objects from participating in this trimming, you can uncheck them in the Shared object panel.
Notes:- Support setting topology edit tolerance. Tolerance refers to the distance between object nodes. Within this distance range, edges and nodes are considered coincident and share the same location.
- By default, the system automatically calculates the minimum tolerance value based on the data. In general, it is recommended to use the default value.
- If modification is needed, click the Tolerance Settings button to manually modify it in the popped-up Topology edit tolerance dialog. After modification, you can click the Reset button behind the input box to switch back to the default value.
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