Hanno Schlichting schrieb:
As of Friday we have added GeoIP as an additional source of location information. This is based on a city-level commercial database. The city level database doesn’t contain a range or accuracy field, so we currently hardcode the value to 40km as an estimate of a typical upper bound for a city size. We are looking at ways to improve that, as the actual result is sometimes only accurate to the country level and should report a larger accuracy value in those cases.
Hrm, yes, 40km is optimistic for most of such data, it's too bad we don't have accuracy data there as it can vary really strongly.
Right now the accuracy field is also hardcoded to 500m for WiFi-based results and 35km for cell-based results. We are working on improving those numbers as well.
There at least we should have some chance to estimate accuracy well from our data. Of course, I have no idea how that would be done in actual code or formulae, but it should be possible. :)
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