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Here is a good explanation of the Quad-Key system used by both Bing and Google maps. http://msdn.microsoft.com/en-us/library/bb259689.aspx http://msdn.microsoft
by kinguy 12y ago
Here is a good explanation of the Quad-Key system used by both Bing and Google maps. http://msdn.microsoft.com/en-us/library/bb259689.aspx http://msdn.microsoft.com/en-us/library/bb259689.aspx
Similar, but without sacrificing accuracy for built-in zoom information. Due to it's layout, they also support using bit -wise operators for all of their operations (since in reality these systems are all just interleaved x/y bits)
- plesner 12y agoThanks for the link. I was familiar with google's system from when I worked there but couldn't find a good description of it so I assumed it was purely internal.
- gbhn 12y agoThe S2 library is here: https://code.google.com/p/s2-geometry-library/ https://code.google.com/p/s2-geometry-library/ It's based on the hilbert curve.