You’ll do better dealing with bad coordinates if your system can recognize how bad
particular cases are.
The worst error I see in Wikipedia is that sometimes people get east and west
confused, so there is this mirror image of Europe reflected across the U.K. You find
cute little Czech towns out in the Atlantic with the seamounts and the shipwrecks.
If you computed the bounding circle for the points, the radius would be an indicator
of the degree of confusion that would be highly effective for smoking out the craziest
“rouge points”
There are other cases where reasonable parties could disagree about the exact
coordinates for things and it is not worth sweating it. Where exactly is the state of
Ohio or Lake Superior? These things are shapes, not points. You couldn’t argue about an
uncertainty radius of 10 kilometers for a point like that, in fact, the consumer system
should know that it can move those labels around a little bit to improve other layout
metrics.