how to find polygon intersecting another polygon

Discussion created by sivasrinivas on Sep 3, 2012
Latest reply on Sep 3, 2012 by stevel

I am trying to find whether a polygon is intersecting another polygon, if it is i need to replace those two intersecting polygons with a union of them. here it is what I am doing

1. Added a layer to map
2. added a graphic layer to map and drawing polygons with free-hand-polygon tool
3. after adding each polygon, need to check is it intersecting any other polygon
4. if a polygon intersecting another polygon, replace those two with union of them

could you please anyone give suggestions how to do find intersection and replacing them with union if they intersect?