[micro_cam]

Thanks for the clarification, the write up isn't clear. Have you benchmarked against postGIS or stock mysql? And tried any larger-than-memory databases?

We were using mongo in a suit of web applications that display the results of ML and statistical analysis of cancer data and we've found its query performance lacking in a number of cases...I think the mongo geospatial index is a pretty simple geohash setup on top of their normal query engine and I would expect it to have the same issues.

I do think this project is very interesting, just providing my feedback based on doing similar work.

Memory overhead of both mongo and hadoop would actually be my biggest worry since, especially on desktop workstations it is quite common for machine learning tools in R or python to need most of the available memory when tackling even small problems.