On 28 Sep 2012, at 06:25, THEVENON Julien <julien_theve...@yahoo.fr> wrote:
> > > > > > ------------------------------ > Le jeu. 27 sept. 2012 20:18 HAEC, Sarah Hoffmann a écrit : > >>> This is the real problem for us. >> >> For the sake of completeness: planetwide there are currently >> 152 million objects. Which means 1/6th of the planet consists of >> French buildings. Now, there is a real problem. >> > Hi Sara, > > concerning problem of disk usage by french cadastre data do you have some > information?particulary do you know how is it stored in database? > to be allowed to use cadastre data we have to add a source key which is long > about 40 characters to each way drawn thanks cadastre data due to legal > agreement with french office goverment providing cadastre data. > do you know is this key is duplicatd for each building in the database or if > there is a smart storage? if not it would be interesting to know which part > of the size is for the key itself and which part is for the geometry. I think > that for buildings composed of one way and 4 nodes the space required by the > could be greater than for geometry. > if this is the case there is perhaps a way to factorise the source key and > dramatically reduce disk usage. The way to reduce the disk space for stuff imported in the future is to store that source once on the changeset instead. Shaun _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
