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Limitations and gotchas:
1. Distances with this new implementation are Kilometers, while the old implementation was using Miles. Since this is what the internal implementation uses, and it is hardly exposed to the end user, we kept using the metric system. It is quite easy to convert this back to miles, and if there will be demand we might introduce a configuration option on the server side to do that.
2. Handling of polygons which cross the dateline isn't supported at this stage.
3. Multi-polygon support is lacking.
This new feature is really neat, and opens up great new opportunities with its simplicity and ease of use. It is available to us thanks to the spatial4j project, and powered by Lucene.Net, Spatial4n and NetTopologySuite.
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楼主: jieforest
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