DKO.

Not familiar w/your method. How is this different than using SMS to query an area, whether that area be 1 pass or more (or any part of a pass) & comparing queries? That's normally how I do it when comparing plots-varieties or whatever. You can adjust query area to leave out the known problems, like slough holes or "lightning strikes" or whatever.

Query answers will come up in precise # of bus/A....not colors or ranges.

Again, I'm not familiar w/what you describe.