We should have the option in map editor to make the square and circle grounds transparent. It's difficult for me to go on Viprin's drawing editor, and do it that way, because the placing may be off or it might not be the right size, and you'd have to start over. I'm not sure if this was suggested before (if it was you can close this) but I haven't seen any threads like this yet. The transparency should vary on a scale 1-10, 1 being barely transparent, 10 being very.

The ground got away leaving behind evidence.

You can make transparent grounds by fittng the colour of it with the colour of background :-)