On Thu, Apr 9, 2009 at 1:30 PM, Frederik Ramm <[email protected]> wrote:
> Hi, > > pablo platt wrote: > >> Is the tiles resolution predetermined >> > > Yes, it is 32 bits. > > We take lat and lon and scale them to a 16 bit value each (this means we > get 0.0055° precision in the East-West direction and 0.0027° precision in > the Norh-South direction). Then we use first bit of the 16-bit longitude > value, then the first bit of the 16-bit longitude value, then the second of > each, and so on, to build a 32-bit tile value. > > Bye > Frederik How do I query this db? For example, if I want to find all records in a distance <= 1.5KM from a (lat, lng) point.
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