Chris Browet wrote: > 2008/8/7 Shaun McDonald <[EMAIL PROTECTED]> > >> Chris Browet wrote: >> >>> >>> Do you think about floating-point or fixed-point >>> coordinates? >>> >>> >>> This is one of the things to discuss. For mobile applications, fixed-point >>> is the most efficient but we have to balance this with the loss of >>> precision. >>> >> Actually the OSM db stores the node's lat and lon as integers. There is a >> scaling factor of 10000000 done on the fly when you read and write notes. This is actually irrelevant for routing and I would even dare to say that the integer format is a lot faster for routing. It would be better to keep integers for routing and only transform the result to lat/lon when it needs to be displayed.
As Stefan said: The format completely depends on the purpose it is supposed to serve. >> >> http://trac.openstreetmap.org/browser/sites/rails_port/lib/geo_record.rb#L22 >> > > Ok, so I guess this is one decision taken! > > - Chris - > > > > ------------------------------------------------------------------------ > > _______________________________________________ > dev mailing list > dev@openstreetmap.org > http://lists.openstreetmap.org/listinfo/dev _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
