Hi, sly (sylvain letuffe) wrote: > In france, next to the cadastre's agreement of using their data for OSM, we > might soon be able to import something like 60% of France's builings.
Assuming that most houses will have 4 nodes, you're talking about importing roughly 10 million ways and 40 million nodes. We currently have about 304 million nodes and 25 million ways. Your import would raise that to 344 million nodes and 35 million ways; looking at the recent development, you would be importing half a year's worth of normal OSM growth within, perhaps, a month or so. On the whole it seems to me that there is nothing to worry on the database side, provided of course the import itself does not use too many resources. Your import would have a node:way ratio of 4:1, whereas the current data has about 12:1 (after the import it would be 9:1). This is probably not a cause for concern. You would be importing about 80 nodes per square km on average. France would jump from 5 million nodes total to 45 million nodes total, from an average of 10 nodes per square km to an average of 90 nodes per square km. The Dutch are already at 100 nodes per square km, and I don't hear them complain, so it seems that such a data density can be handled sufficiently by the existing tools. I would imagine some complaints from those users who are not interested in buildings, and for whom 90% of the data they download is useless after the import. You might have to provide filtered extracts for them. Bye Frederik -- Frederik Ramm ## eMail [email protected] ## N49°00'09" E008°23'33" _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
