1. Brest Metropole Oceane
Differential import
 François Van Der Biest (@fvanderbiest)
 Steven Leroux (@stevenleroux)

2. First step
 Import ”official” dataset in local postgis database
 Shp2pgsql
 Ogr2ogr
 ....
 Import OSM dataset in same db
 Request to XAPI on same bbox, then ...
 osm2pgsql

3. Initial datasets compared

4. Buffer creation

5. For each way : length(way
in buffer)/length(way)
criteria for import : ratio 50 %

6. Red roads are marked for
import

7. Refinements

8. Red = to import

9. Detailed How-to
● Can be found at this URL:
http://wiki.openstreetmap.org/wiki/BMO
● twitter @fvanderbiest