[Talk-us] NHD data extract

[Ian Dees]

On Tue, Apr 26, 2011 at 8:30 AM, Ben Supnik <bsupnik at xsquawkbox.net> wrote:

> Hi Ian,
>
> Where on the OSM servers is the current NHD data, and in what format?  I
> didn't see it referenced in the wiki work-flow.


They're currently only used to render TopOSM and aren't available via HTTP
or whatnot. I had plans to convert it all to OSM but ran into the problem
you're seeing below:


>
>
>  - Not all of the data types contain enough information to split like
>> this (last I checked the linear features were the only ones with reach
>> code. Polygonal features don't contain subbasin information)
>>
>
> I am looking at this now.  Some of the polygonal lakes definitely do
> contain reach codes, others contain NULL.  From what I can tell, there are
> fcodes that indicate that there is no reach code (or any meta data).
>
> For the polygonal "area" data (which includes large rivers) there are
> indeed no reach codes. :-(
>

If I remember correctly the area data has some sort of ID which links it to
the waterway (which has a reach code). The area data is what wraps a
waterway when it has a width greater than some standard "too wide for a
single line" width.
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