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Is there any in memory spatial index specialized for frequent updating point objects?

The dataset will be moving cars, most likely update per second but with millions of them.

The project will be written in c/c++.

  • In what software? Please edit this question to contain several paragraphs describing your platform, GIS software, and data. – Vince Nov 2 '15 at 3:20
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Yes, Try TPR-tree from libspatialindex. It features:

  • Generic main memory and disk based storage managers.
  • TPR-tree index.

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