Here are a few other GNIS issues to be aware of: 1) Duplicates - As someone else pointed out, the GNIS points were digitized off of the USGS topo maps. If a feature is actually in multiple map sheets (such as a mountain), it may appear multiple times. I believe it was done by state, so if a feature appears in multiple states there will be multiple entries in the GNIS (sometimes with slightly different names). I have pointed out a large number of such cases to the Board on Geographic names, but that was after the import to OSM, so you may still encounter them.
2) Classification - It seems that the GNIS used an automated query to classify some of the GNIS points. For example, a "park", particularly in the western US, can be a broad flat relatively treeless valley. Many of these types of parks were mis-classified in the GNIS as the recreational type of park. I pointed out some of these to the Board on Geographic names, but again, that was after the import. Mike
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