What open source spatial index libraries exist? [closed]

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I am looking for a spatial index library in C# that has to be able to index geometries (circles, polygons, polylines) as well as answer intersection questions. I found NetTopologySuite (NTS) and some other one-file solution project but I wonder if I missed anything significant?

NTS is pretty good but somewhat heavy. The second one is a one man art and apparently I have to pick it up and maintain myself. I wonder if I can find something that is supported and tested.

I am looking for C# one but if I can get hands on Java one, I can adapt that.

Answer 1

libspatialindex seems to have all the features you want, but it's in C++

JSI is a Java project, but it only works with rectangles.

Answer 2

I am not 100% sure but i guess Solr and Elastic search supports spatial index. They are in Java and they support REST.

Answer 3

I found some good examples here http://www.rtreeportal.org/