[OSM-talk] Suggestion for an Unconference
eda at waniasset.com
Fri Nov 26 22:25:58 GMT 2010
SteveC <steve <at> asklater.com> writes:
>Speaking personally about what large orgs and what they want, I think it's
>pretty simple. Have a look at commercial data and OSM and do a diff, what are
>the main things missing? Addressing for geocoding and turn restrictions for
For addressing, I guess it is usually sufficient to have a street name - the
exact addr:housenumber stuff is not needed I assume?
OSM already has plenty of tools for 'noname' hunting but it is harder to track
down streets which are missing from the map altogether. In the United Kingdom
we are fortunate to have the OS Locator database to check against, although even
that is by no means complete. Without such a secondary source, noticing that a
particular obscure side street is not on the map has to wait until a dedicated
OSM contributor happens to walk past it. In a seemingly-complete area, that
could take a while.
But I think that name searches (from a website or a geocoding API) can help with
the task of finding missing addresses. With access to a big dump of all name
searches done from the Bing website (suitably anonymized) it would be possible
to feed them all through Nominatim and see likely candidates for missing
streets. Of course this procedure can produce only hints for resurveying, it
can't add the streets to the map or even provide proof that they exist, but for
getting the last 2% of missing addresses in an area we have to take any help we
can get. Are you and the other Microsoft people able to generate any bulk data
of this kind?
Turn restrictions are also hard to survey manually. A mapper on foot or bicycle
might not pay much attention to them, and again, it is hard to know when you have
all of them. They might possibly be suggested from analysis of GPS traces,
provided we have a large number of traces for an area and they are clearly
tagged to show which ones are for travelling by car. This is one reason why a
standard tagging scheme for GPS traces is needed.
Ed Avis <eda at waniasset.com>
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