Ed wrote:I think there's possibly 4 sorts of ambiguous feature:
1. it's in the right place, but whether or not it constitutes a feature is ambiguous (the very shallow re-entrant and the (in)distinct vegetation boundary are possibly the canonical examples of this)
2. it's a feature, but it's ambiguous as to whether it is shown in the right place on the map (e.g. the bingo pit)
3. it's a feature, but it's ambiguous as to whether it is mapped correctly/clearly (e.g. is it a crag or a boulder?)
4. it's a feature, but it's ambiguous as to whether it is the correct one/the one shown on the map (e.g. the pit in a pitted area)
1 & 3 may be acceptable as control sites
ok fair enough there are different sorts of ambiguous. If the controller and planner agree that the control is in the right place but for whatever reason the feature might be difficult to identify then hang the control high. If you can't be certain it is in the right place then don't use it.