Hello, Every 3 months, the layer UrbAdm of Urbis is updated and we do not have an automatic way to know what to update in OSM. So I tried some experiments and I write an article about it : http://blog.champs-libres.coop/carto/2015/12/01/comparaison-urbis-osm.html
As the article is in French, here is a quick explanation in En : - the OSM data & Urbis data are loaded in a PostGIS database - for the moment only one type of polygons that are different in Urbis & OSM are detected : - polygons such that : - there is an intersection between the osm polygon and the urbis polygon - the Hausdorff distance between the osm polygon and the urbis polygon is greater than 0.0015 ( https://en.wikipedia.org/wiki/Hausdorff_distance ) Theses polygons are there : https://cloud.champs-libres.coop/index.php/s/GpGVahe6wMCtPNn The method can easily improved to detect polygons that are in urbis and not is OSM (and vice-versa). But there is some work to perform to detect more precisely the difference and also for dealing with multi-polygons Marc _______________________________________________ Talk-be mailing list Talk-be@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-be