[Talk-us] County borders vs. State borders

[Alexander Roalter]

Am 18.10.2011 13:43, schrieb Greg Troxel:
>
> I would recommend contacting the MN state gis department, which might be
> part of the state highway department.  There are probably people there
> who understand the rules and can point you to them.  Someone from
> MassGIS was very helpful when I had questions about town lines.
>
> As an example which won't help you in MN and IA, but will give you an
> idea of how hard this can be:
>
>    http://www.mass.gov/mgis/townssurvey.htm
>
In the other thread about the Massachusetts county borders, I saw (or 
better put, read) how messed up things can be. I slowly worked my way 
from Iowa through Minnesota to Wisconsin, Illinois and Ohio.

When I wanted to take a crack at Michigan (area a bit north of Detroit), 
I found things a bit disturbing, as someone already put in (in my 
opinion) very precise county borders (a good thing), added also township 
borders with admin_level=8 (also a good thing), but didn't connect all 
the township borders (a bad thing), so there were corners where 4 
boundary lines met somewhat roughly (or exactly, but with two nodes on 
the same place).

I tried to clean this up a bit, but it looks like it is quite a bit of 
work... Some county lines are missing at all, and many of the township 
borders weren't closed (or are missing parts). Since the last edit was 
early this year, I don't think it's a work in progress, so I'll see what 
I can do cleaning this up. If anybody else knows a better way, feel free 
to do so, I'll be pushing Michigan back for a bit and continue westwards 
of Iowa.

-- 
cheers,
Alex