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Postgis is an extension to Postgres, rather than a stand alone application, that provides a spatial data type to Postgres, and provides numerous spatial functions that operate on geometry(ies). Spatial indexing, which you will surely need to find n closest points efficiently, is implemented as an extended R-tree, but the indexing mechanism comes from ...


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CartoDB doesn't allow by default direct connections to the user databases to external databases. If you're not an enterprise customer, perhaps the Foreign Data Wrappers that CartoDB offers, as said in the comment, are not interesting to you. The best approach would be connecting your database with the CartoDB SQL API so that you're able to maintain both ...



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