I was wondering if anyone knows of a simple tool that gives you something like a heat map that is resistance to ground of different parts of the ground plane in a PCB. What I am particularly after is working out where there are long paths to ground (EMC) and or large enclosed areas between signal and signal's ground path. Also, if there is a single track that is forming the link between one large area of ground plane and another.
I am using Eagle so something that worked within Eagle would be great (e.g. script), but a separate tool that takes gerbers is another option.