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I am the author of AlchemyDB:

I would very much like to add geospatial indexing in the form of R-trees (most likely) and need some advice on whether or not there any C/C++ packages that have simple stripped down R-trees. I am a big fan of small codebases that are easy to read.

If anyone has any suggestions or knows of any experts that I could bug (I can pay for their time), I would be grateful

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Hi Russell, welcome to our site! I would like to invite you to place some information about yourself in your site profile: that's where people can look to see who you are, what you do, etc. – whuber Jun 28 '12 at 13:32

You might look at libspatialindex - , it seems to have decent documentation.

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