[Talk-us] 25or6to4 NHD imports

[Toby Murray]

From: Jason Straub [mailto:straub20 at yahoo.com]
> Sent: Thursday, May 03, 2012 1:44 AM
> To: talk-us at openstreetmap.org
> Subject: Re: [Talk-us] 25or6to4 NHD imports
>
>
>
> Howdy,  After discussion with Toby, I am updating the list with my import
> efforts.  First, hopefully this message goes through, as none of my previous
> ones have worked...  Second, was introduced to a better way to create a new
> account, so the TexasNHD account will be used for uploads.  Third, I have
> been taking the NHD shapefiles, pulling out only the areas more than 0.5
> km^2 for this round of uploads.  This edited shapefile was run through
> shp-to-osm.jar with the NHD rules file on the wiki, then uploaded piece by
> piece through JOSM.  For error checking, have then redownloaded the areas
> that were uploaded and doublechecked for errors/open ways/dupe notes/etc.
>  Once (if) we have minutely diffs going into the APIs, I will do a
> triplecheck for any more glitches.

Thanks for explaining your process a little. It does sound like you
are doing some good work and being careful about things. The bit of
visual checking I did around Toledo Bend Reservoir showed that your
outline was substantially better than what was there before (I think
PGS, so no surprise I guess) so keep up the good work.

As Paul mentioned, there are some subtleties in the NHD data. I know
in some areas, pretty much all linear features were imported as
waterway=river even for small things that should have been
waterway=stream or something else. This became glaringly obvious when
the osm.org stylesheet was updated to render rivers at a lower zoom
level and northern California went completely blue from all the
"rivers" - so something to watch for if you start venturing to other
NHD data.

Toby