[Talk-us] Questions about bsupnik's NHD OSM files

Paul Norman penorman at mac.com
Wed Mar 13 22:04:09 UTC 2013

> From: Ben Supnik [mailto:bsupnik at xsquawkbox.net]
> Sent: Wednesday, March 13, 2013 2:52 PM
> To: Paul Norman
> Cc: 'Mack Stanley'; OpenStreetMap US Talk
> Subject: Re: [Talk-us] Questions about bsupnik's NHD OSM files
> Hi Y'all,
> I've been out to lunch re: NHD for a while..Paul, a stupid q:
> > The NHD data model changed shortly after bsupnik wrote his conversions
> > and some fcodes changed. This makes using his conversions difficult.
> Does this imply that the actual _raw_ dump I have of the data from NHD
> is fundamentally obsolete and that anyone working on NHD should be using
> newer source data?

This is true regardless of the schema changes. NHD has a 3 year planned
update cycle. Depending on the region, this means that the data may have
been updated or not, but if you're working country-wide you have to be able
to process the latest.

The schema changes just an additional reason to not use the old data. NHD
has a set of files in the older schema on their website but I don't believe
these are being updated.

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