[OSM-dev] indoor wifi geopositionning - openstreetmap precision, collaborators?

Lars Francke lars.francke at gmail.com
Mon Nov 30 03:34:03 GMT 2009


> The only thing I see potentially getting in your way is that the OSM
> database doesn't store enough significant digits of lat/lon
> coordinates to make indoor mapping viable, but perhaps it does. I
> couldn't find documentation on how many digits it stores and how that
> translates approximately into real-world meters/centimeters. Perhaps
> someone else can chime in with that information?

The code is here:
http://svn.openstreetmap.org/sites/rails_port/lib/geo_record.rb
Seven fractional digits are saved. That should be somewhere in the 1-3
centimeter range depending on where you are and I believe that'll be
enough for indoor mapping :)

Lars




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