Function Description

The erase function is used to remove the part of the target object that overlaps with the erasing object.

Target Object	Erasing Object	Operation Result

This function can switch the erase effect by holding the Ctrl key. The erase effect when holding the Ctrl key is as follows:

Erasing and Target Objects	Operation Result

• The erase function applies to polygon layers and CAD layers, and is available only after enabling layer editing and selecting objects.
• The target object and the erasing object cannot be the same object.
• The target object can be a line object or a polygon object, but the erasing object must be a polygon object.
• The layer of the target object must be editable. Supports Multi-layer Editing.
• The erase operation has certain requirements for data standardization; topology errors such as self-intersection are not allowed within the data. It is recommended to perform a topology check on complex data before the erase operation, and correct any topology errors before proceeding.

Function Entry

• Edit Data Tab -> Feature Editing Group -> Face editing -> Face relationship -> Erase

Operation Instructions

1. With the layer editable, select one or more erasing objects (polygon objects).
2. In the Edit Data tab, from the Face editing drop-down menu, click the Erase button in the Face relationship group to perform the erase operation.
3. Mouse prompt: "Please select the target polygon object... Press Ctrl to switch to erase external." Select a target object (line object or polygon object), and click the left mouse button to complete the erase operation.
4. You can sequentially select target objects to perform the erase operation, and close the erase function by right-clicking.