On 08/25/2011 07:33 AM, Serge Wroclawski wrote:
I know Ian (who did the GNIS imports) gets ruffled feathers when I
mention to him that sometimes if there are duplicate GNIS features in
an area, I've just deleted one that I thought was "less correct".
I could have (probably should have) taken the gnis id tag and merged
it with the existing feature, but the point is in our dataset, one
can't assume that links between the imported object and the current
object exist. You can't assume it through object IDs and you can't
really assume it through tags. There will be edge cases in both sides
which keep it from always being true.
Each piece of data is a hint for future conflation process. So I
encourage key preservation, especially for gnis. Those are officially
recognized names, and the data does change slowly over time.
Here's an example where to imports both brought in "castro park". I
deleted one of them, but copied over the gnis key:
http://www.openstreetmap.org/browse/way/43951227
So hopefully a future gnis import would see that "Castro Park" need not
be duplicated again, even if the park gets renamed by the City.
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