@Martin: you are right there, naturally. I should have said "You cannot do this automatically with a mass edit. You need to consider each situation. In many cases you may be able to understand the situation from satellite photos (for example from shadows!) but there will be a large number where you can only correctly map from on-the-ground survey."
@Eric: I looked at more examples, and I have to admit that you are right with your statistical (0.1%) argument. Most cases I looked at, are obvious accidental tagging errors.
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