Hi, Le 27/09/2012 02:18, Paul Norman a écrit :
Now, the analysis of geometry. One measure of how broken down into parts buildings are is to take the buildings, turn them into polygons, combine them into one multipolygon with ST_Union and then count the number of parts with ST_Dump and compare it with the original number of buildings. This does not consider buildings made from multipolygons (e.g. those with an inner hole). I get the following data Changeset Joined Original 13175035 3661 6341 13175649 503 1240 13176058 521 951 13176212 219 341 13176769 922 1510 13177032 1515 2782 13177569 2216 4291 13180264 536 830 13180628 1449 2230 13181698 2 2 13183198 506 883 13184921 286 462 13185567 255 438 13185645 1135 2373 Total 13726 24674
I am not sure to understand the right way how you deal with multiple buildings sharing ways (= sharing walls IRL) and having each a different house number.
For instance how many "joined" buildings would give your analysis here : http://www.openstreetmap.org/?mlat=48.86494&mlon=2.33&zoom=18&layers=M = the block between Rue d'Alger and Rue du 29 juillet ? vincent _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
