[Tagging] Layers (was Eruvs etc.)

[Kevin Kenny]

On Wed, Sep 7, 2022 at 7:56 AM Frederik Ramm <frederik at remote.org> wrote:

> I think that the most important thing for us to map correctly is how
> things relate to one another, and the physical accuracy in terms of
> coordinates is (a little) less important.
>
> A hypothetical routing engine could refuse to plot a route along the
> road if it intersects with a an area marked "no access".
>
> If in practice the road can clearly be observed to run between the two
> "no access" areas, then I would endeavour to model that fact in
> OpenStreetMap and consider the (potentially imported) "authoritative"
> data on the overlapping landuses wrong.
>

Yes. I was careful to get that part right when I redid the border of West
Point (US Military Academy). I left cutouts for the rights-of-way of the
public-access roads that traverse its land. Across the river, I also
conformed an indefinite boundary to a hiking trail
https://www.openstreetmap.org/user/ke9tv/diary/42951.That diary entry is
linked to from `notes` on all the ways involved, since I've struggled at
times with mappers 'correcting' the alignment to the 'authoritative'
border. (See the diary entry for a brief discussion for why the
authoritative data are wrong and likely to stay that way.

It's considerably less important for a town line, say, or a state forest
that's public-access anyway.

I guess the upshot is that we should glue features where the topology is
known and important. In doubtful cases, it's probably better not to glue.

-- 
73 de ke9tv/2, Kevin
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tagging/attachments/20220907/62287fb1/attachment-0001.htm>