On Thu, Aug 5, 2010 at 4:43 PM, Alan Mintz <[email protected]<alan_mintz%[email protected]> > wrote:
> At 2010-08-05 11:52, Ian Dees wrote: > >> ... >> It isn't any different. I had made the (bad) decision at the time to >> import over any existing data because in the several hundred places I >> spot-checked, NHD was vastly superior in resolution (and probably quality). >> > > By "import over", do you mean to add duplicates, replace the existing > features, or merge the info from the two manually? > Add duplicates. > As I manually survey various features (POIs, some hydro, etc.), I usually > try to merge in the data from existing imports so as to maintain the link > (e.g. gnis:feature_id) back to the original database, in case we want to > exchange updates with them again. > > One thing that occurs to me that may be a problem is that I occasionally > have to delete a feature that is no longer present (e.g. > http://www.openstreetmap.org/browse/node/358808220). If we were to feed an > update back to GNIS or get one from them, this situation would have to be > taken into account. > > When I made the original GNIS import I saved the resulting XML and IDs (which would have allowed us to detect deletions) but promptly lost it in a hard drive crash.
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