[Talk-us] [Talk-ca] silly borders

[Zeke Farwell]

I agree that relations are the way to for borders.
Here is an example of 3 border ways meeting at a point, but sharing
National, State, Provence, and County boundary relations.  It's where the
New York/Vermont border meets the US/Canada/Quebec border:
http://www.openstreetmap.org/?lat=45.01193&lon=-73.34281&zoom=15&layers=B000FTF
Here's another example where the Ontario/Quebec border meets the
Canada/US/New York border:
http://www.openstreetmap.org/?lat=45.00428&lon=-74.66812&zoom=15&layers=B000FTF

In the Vermont area I have manually removed all but one way at each border
and made that way a member of the appropriate relations.  Bit of a pain, but
it's mostly done now.  For the US/Canada border I've found the Canadian
Geobase data to be more accurate than the TIGER data.

Zeke Farwell
Burlington, VT


On Tue, Mar 31, 2009 at 12:22 PM, Richard Weait <richard at weait.com> wrote:

> On Tue, 2009-03-31 at 10:00 -0600, James Ewen wrote:
> > The end result, is that I would concur that the GeoBase borders are
> > much closer to the real world location than the manually input border,
> > or the USGS imports.
> >
> > So, now we need to clean up the erroneous data.
> >
> > The county outlines in the US are circular ways, the GeoBase ways are
> > not.Will it affect rendering by cutting up the US county circular
> > ways, and making them part of a combined way? Can I cut the GeoBase
> > ways at the Alberta, BC and US confluence, and then add in a bunch
> > more tags to the common borders? Can we tag the same way as a
> > border_type: state, and also border_type:international, then do
> > state:left, province:right, county:left, county:right, etc?
>
> I think relations are the way to go.
> Tag the way with the source, uuid and attribution.
> Split the way at each prov/state/county/regional municipality junction.
> Add tags only at highest level relation for say, name, place,
> population, ...
> Include the way in Canada relation - boundary=admin, admin_level=2
> Include the way in USA relation - boundary=admin, admin_level=2
> Include the way in state/prov/muni/county relations as appropriate.
>
>
>
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