[OSM-talk] Fwd: Addresses are a tiny fraction of what we do (was: The world's best addressable map)

Marc Gemis marc.gemis at gmail.com
Fri Oct 24 21:04:31 UTC 2014

Thanks a lot for sharing the methodology of the French community.
I like this approach



On Fri, Oct 24, 2014 at 9:38 PM, Christian Quest <cquest at openstreetmap.fr>

> Addresses in France...
> We started a project to collect addresses on a separate database called
> "BANO" (Base d'Adresses Nationale Ouverte : Open National Address Database).
> We've recreated data from the national cadastre (scrapping 1.3 millions
> PDF files), opendata source and... OSM.
> This database contains 15+ millions addresses so far, and we added almost
> 4 millions hamlet and locality names recently.
> A full dump contains 19.7 millions locations ranging from housenumber to
> municipalities (no POI).
> Why we did it that way ?
> Import of millions of address can be done quick and dirty in a couple of
> days, but such a "blind" import does not really fit the import policy and
> we also learned from the TIGER import that fixing data is much less fun
> than creating new data.
> Why import all this if the data is available (under ODbL) ?
> It seems much better to take the required time to import these data street
> by street, reviewing it to make sure we improve its quality and not just
> copy it. This will take years, many years (from 5 to 20) depending on how
> deep to review the data before the upload. Some contributors have started
> this work, but it is really boring and I don't expect we can attract a
> large bunch of contributors on that project.
> Anyway, BANO updates its content every night and collects new OSM
> addresses to replace other sources. So it also take advantage of address
> reviewing/fixing done in OSM during this import process or during any
> address related contribution.
> What is much more interesting is that OSM contributors can use BANO to
> detect missing roads/streets and names (we have a BANO tiled overlay
> showing missing names like here
> http://layers.openstreetmap.fr/?zoom=18&lat=48.8474&lon=3.23191&layers=B0000FFFFFFFFFFFFFFFFFFFFFT
> ).
> This seems much more useful as we're far from having all roads and streets
> mapped and named in France.
> We can even see this "BANO effect" on some graphs:
> http://osm2020.free.fr/qa-commune/popu-sans-route-name-france.png
> Yes, something happened last may... BANO started to be available at that
> time and the population for which no nearby named road was present as
> decreased almost twice faster since then.
> You can see also the missing names graph here:
> http://munin.openstreetmap.fr/osm12.free.org/osm104.openstreetmap.fr/bano_rapproche.html
> More than 100.000 names have been added since may.
> To summarize... yes, address are really an important dataset, mainly
> because it allows to cross the boundary between non geographic data (postal
> addresses) and geographic data with the help of (good) geocoding algorithm.
> This allows to bring a lot of new data users to OSM by providing the data
> fuel for services like routing from address A to address B. Some public
> services web sites have started using OSM + BANO that way.
> This also allows to geocode new (open) datasets to improve OSM with more
> interesting data (we're about to do this for almost 30000 pharmacy).
> Is it mandatory to have the huge address datasets in OSM ?
> Maybe not, and not if the import process does not bring any improvement to
> the data.
> Mappers' time seems to me much better used for less mechanical
> contributions.
> --
> Christian Quest - OpenStreetMap France
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