[Talk-us] NHD import: what data quality is acceptable?

Paul Norman penorman at mac.com
Mon Jul 23 15:49:37 BST 2012

> From: Kevin Kenny [mailto:kkenny2 at nycap.rr.com]
> Sent: Monday, July 23, 2012 5:45 AM
> To: talk-us at openstreetmap.org
> Subject: Re: [Talk-us] NHD import: what data quality is acceptable?
> On 07/22/2012 09:33 PM, Paul Norman wrote:
> > The mappings on the wiki are not only incomplete and inconsistent,
> > they're for an older NHD version and sometimes clearly wrong.
> >
> > I posted a better one
> > (http://lists.openstreetmap.org/pipermail/talk-us/2012-July/008502.htm
> > l) earlier this month but it didn't attract any comments, and it's not
> > complete either. It handles most of the FCodes but still is missing a
> > couple. It also needs some post-processing to clean up over-noded ways
> > and some other matters.
> Right. I downloaded and looked at your code, but I was already pretty
> far along when you posted that message. I'd mostly been working by
> diligently examining, each time I encountered an FCode that I haven't
> seen before, what the feature actually is, from personal knowledge. (I
> then often presume that other features having the same FCode are the
> same general sort of thing.) 

This unfortunately falls short. I find that you need to check the FCode
across at least 3 different parts of the country to be sure. I've found
there are regional variations in how FCodes are used.

I hope to get back to my code in the next week. With the redaction it hasn't
been a high priority. Also, no one has proposed a NHD import lately.

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