Using lines to subdivide polygons

You can digitise lines or use existing lines to split polygons into smaller polygons. In this example, an area covered by a large vegetation polygon will be subdivided by digitising division lines and using the Split operation.

To subdivide a polygon:

1. Using the Create data bar, digitise division lines to close off the area you want to split from the larger polygon. For example:

2. Select the large vegetation polygon. From the Edit menu, select Split.
3. Select the new polygon you created from the division lines and click

Switch to Topology mode if the division lines are difficult to view or select.

The polygon is split into two polygons: the area defined by the division lines and the original larger polygon. For example: