I am trying to intersect polygons on two layers using a line, however I want to only select polygons from layer 2 where the area is not already covered by layer 1.
So basically imagine each layer has one polygon and they overlap, and the polygon in layer 2 is bigger than the polygon in layer 1. If I have a line running through them, I only want to intersect the bigger polygon from layer 2 if the line intersects the areas that are not overlapped by the polygon in layer 1.
Subtract one polygon from another on the fly
Hi ITMarinePress,
If I misunderstand your question please let me know.
It looks you want to remove the polygon 1 covered part in layer 1 from the polygon 2 in layer 2, and then split the rest parts in layer 2 by a line in layer 1, does that right?
If so you can use can operate that by the follow steps:
- Get the line shape 0, get the polygon 1, get the polygon 2
- Polygon 2 remove polygon 1
- Polygon 2_rest split by line shape 0
You can do that by our spatial query API, if you want to directly operate them, you can try our GisEditor.
Wish that’s helpful.
Regards,
Ethan