On small village, here is how I'm doing it: - use cadastre.openstreetmap.fr to generate the building .osm file - open the file in JOSM - use JOSM validator to detect inconsistencies (like overlapping building polygons) and fix them - check building position with the help of aerial imagery (BD Ortho IGN si the prefered one), move what needs to be moved (cadastre is not highly accurate). For this I usually move entire blocks as the offset comes from original sheets covering a couple of blocks. - "zoom on data" and load all existing OSM data in the area - use JOSM validator to detect buildings crossing other object like roads, streets, etc... - replace some existing buildings with the new, last cleanup... - upload ! - do the next one...
2017-02-13 23:07 GMT+01:00 philh-591 <[email protected]>: > En anglais parce que je dois préciser - pardon. > > Near me in sud Gironde there are a number of small rural communes with > no buildings at all mapped in OSM. Is it OK to take the building data > for an entire commune from http://cadastre.openstreetmap.fr/ and upload > it all into OSM? > > I don't mean I'll just do it blindly. I'll check carefully for existing > buildings first and exclude them from the upload. If there are just 2 > or 3 buildings I'll check to see whether I should transfer their tags > over and update them or not. > > I'll only do 1 or 2 communes at a time. After each upload I'll wait a > day or so for Osmose to run, then check and fix errors and warnings that > it reports. > > I'll use JOSM for the upload and to fix any problems. I understand the > importance with JOSM of always using "Paste at source position" if > copying and pasting buildings from the cadastral data, so that the precise > positioning from the cadastral data source is retained. > > Previously I've added blocks of buildings in empty areas by selecting > patches > of areas around where I'm adding mapping detail and uploading. See the > main road between Langon and Bazas for some examples. It was while doing > this that I noticed some completely empty communes such as Aubiac. > > I wouldn't try this on an urban commune which would have far too many > buildings, but it seems like it should be OK for small rural communes. > > I've installed the reverter plugin to JOSM, so I'll be ready to undo any > of my changesets that make a mess. > > - Phil - > > _______________________________________________ > Talk-fr mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk-fr > -- Christian Quest - OpenStreetMap France
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