Norman Vine <[EMAIL PROTECTED]> said: > David Megginson writes: > > > > Julian Foad writes: > > > > > It seems *awfully* redundant given that there is already the Id > > > *and* the geographical location. > > > > The lat/lon would be fine for searching inside 10 deg x 10 deg chunks, > > but it would get very expensive if we had to store polygons for all > > country and region boundaries and do point-inside tests for every > > airport. On balance, I think that this is a reasonable optimization. > > I hope that this data base is stored in XYZ form and not lat lon > else any optimizations you make by spatial partitioning will be > nullified by the trig calls required to get distances
If changing the format, another consideration would be anything that might help the implementation of modern flight system emulation. I'm thinking about "get nearest airport", "list nearby airports with runways over x ft/m length", etc. For some reason I was thinking that lat+lon would be easier for that sort of function. Best, Jim _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
