Setting a filter to exclude anything over 1000ft will eliminate all aircraft above that level, but will not gauantee that you see aircraft on the ground. It all depends on your proximity to the airfield and clear line of site i.e not blocked by terminal buildings and then of course the equipment that transmit the data from the aircraft, some aircraft I belive will turn off the equipment upon landing whilst others may not have the equipment at all, especially light aircraft. Some aircraft will be diplayed in your log because no position has been transmitted to allow RB to display on the map.