osm at inbox.org
Tue Dec 8 03:26:29 GMT 2009
On Mon, Dec 7, 2009 at 4:47 PM, Roy Wallace <waldo000000 at gmail.com> wrote:
> On Tue, Dec 8, 2009 at 12:49 AM, Anthony <osm at inbox.org> wrote:
> > Fortunately, you're not mapping for a router. If there's no verifiable
> > data, you shouldn't map anything at all. I guess "unknown" would also be
> > acceptable, though.
> I think this is an important point. It becomes a problem when people
> try to map the *law*, because legal status is often difficult to
> verify - e.g. you can't see it!
I think that's true in some situations, but that's not exactly what I was
getting at. My response was to a situation where "the honest truth is that
it's private land and the owner doesn't seem to care".
The "private land" part is mostly likely verifiable, and can be tagged.
"The owner doesn't seem to care", is, in my opinion, best expressed with the
*lack* of a tag.
Legal status often *is* verifiable. It's not always "mapping what's on the
ground", but I think we've got a ways to go before we can get away with only
mapping "what's on the ground". I agree it's a good ideal, but to follow it
strictly, the routers would need a separate database to hold a list of
For example, just one example, here in Florida bicycles are allowed to use
certain roadways (most roadways, in fact, but I'm too lazy to look up the
exact law right this second). I'm not sure that's a universal law,
applicable everyone in the world. But it's a law here in Florida, and there
are no signs which say "bicycles allowed". Thus there's nothing "on the
ground" to map. In theory we shouldn't map this. That means in Florida, we
don't map "bicycles allowed", and in X-land (where bicycles aren't allowed
by default, but there aren't any "bicycles prohibited" signs), we don't map
"bicycles prohibited". However, that requires routers to know if they're in
Florida or X-land (relatively simple, we have boundary relations for that),
and to know what the default law is in Florida and X-land (that's the part
we don't currently have).
The alternative, is to use a completely different set of highway tags in
Florida and X-land, which I suppose is one of the myriad of currently
proposed solutions (mixed in with lots of other solutions, and lots of
non-solutions as well).
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