[Talk-us] admin_level=8 boundaries in Parker County, TX

[Josh Lee]

Some of the US boundary data gives "USGS DRG" as a source. This seems
to stand for "Digital Raster Graphic" files. It is my suspicion that
this raster was vectorized as part of an import process, but I have no
documentation to support that. Still, I consider it a convenient
explanation for why the data doesn't seem to match anything currently
available from TIGER.

Here at the PA/WV state line there is an anomaly of about 100m:
https://osm.org/go/ZWmfhbe
The current OSM data have the PA/WV boundary as a straight line, but
TIGER says it's not. That's the only reasonable explanation for the
Weirton city border to jut into PA by this much — the city border is
true to currently available TIGER data, and state border needs to be
updated.

On Mon, Jul 9, 2018 at 2:36 PM Martijn van Exel <m at rtijn.org> wrote:
>
> Frederik,
>
> These boundaries are often very outdated. I don't know which TIGER vintage they were imported from. I have been replacing them piecemeal from current TIGER as I work, but we should probably replace them altogether and have a plan to keep them updated. I don't think they interfere with other features much, but obviously that should be researched.
>
> As for this specific case, current boundary from TIGER 2017 in brown, OSM in green: https://cloud.rtijn.org/s/bpxPffp6ycm8rF7
>
> --
>   Martijn van Exel
>   m at rtijn.org
>
> On Mon, Jul 9, 2018, at 05:10, Frederik Ramm wrote:
> > Hi,
> >
> > I've recently traced a little bit of stuff in Annetta, TX. The area I
> > looked at had a lot of potential for someone interested in mapping from
> > aerial imagery (houses, tracks, driveways, parking missing; some
> > driveways tagged as highway=residential etc.) and I did what I could in
> > the small area I worked on, but there was one thing I didn't dare touch
> > and that's admin boundaries. The ones I encountered often cut straight
> > through residential buildings and I thought that can't be right, but I
> > know too little about boundaries in the US to fix any of it. I am
> > specifically talking of
> >
> > https://www.openstreetmap.org/relation/114418
> >
> > and
> >
> > https://www.openstreetmap.org/way/33245202
> >
> > - maybe someone local wants to give them a closer look. Maybe it's ok
> > the way it is. The Annetta North boundary is relatively straight but has
> > one wobbly bit, is there maybe a waterway missing in OSM?