Thanks for your work John! I need to take a clother view if I have a bit more time for that.
Well I guess what Jaakko says is partly true. Mssive Data (see e.g. the fat imports) doesn't show up how good (here lively) the quality of the data is. thats why I personaly like OSMatrix as you can analyse different quality indicators (buildings, allotments, last Edits,...). My background for asking for non EU quality measurements is, that I try to convince a bigger company on using OSM as GIS data source. Cause their management is stated in the US I beliefe, that they aren't aware on the actually quite good quality here in Europe :/ bye Matthias Am Dienstag, den 23.08.2011, 03:53 -0500 schrieb Jaakko Helleranta.com: > Stupid(?) question: > Does this merely look at data density in the given areas? > > > My observation from nearly a year in Haiti says that I wouldn't draw > any solid link between data quantity/density and quality. It may (or > may not) seem that in general where there are active communities then > OSM data is also of good quality and density can be seen as a general > proxy(?) for map (database) quality but it's also clear that a lot of > data can also simply mean a lot of crap. > > > Cheers, > -Jaakko > > -- > [email protected] * Skype: jhelleranta * Mobile: +509-37-269154 > * http://go.hel.cc/MyProfile > > On Tue, Aug 23, 2011 at 1:29 AM, John Harvey > <[email protected]> wrote: > I took a look at a bunch of cities around Europe, North > America and some of Asia. I convert the OSM data into a > compressed vector form that scales pretty linearly with node > density, way density and POI metadata. For these cities, I > try to fit as much city as I can into less than 20MB. I use > Lambert Conic projection to try to reduce the latitude spread > effect. Short answer, less data means larger area of city. > Paris has the highest density in the world (I fit 16 4km x 4km > tiles in 20MB), Boston has the highest density in North > America (49 tiles). > > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
