问题
I have about 80 million spatial points(3D) and I want to find all the nearest neighbors of a query point which lie under a sphere of a certain radius(can be given as input) with the query point as center.
I have read about some data structures that are used for such kind of search, such as Kd-trees, octrees or range trees. For my application, I only need to populate the data structure once and then search for multiple query points.
My question is:
- Is there any better way or a better data structure than Kd-trees in this case?
- With kd trees, I'll have to find the median of such a large dataset multiple times, which may take a lot of time to populate the tree.
I don't know much about any of these data structures so could you please refer some tutorials about whatever solution you may recommend. I know this question may seem repeated but from all the questions I found and read, no one was using such a large set of points.
来源：https://stackoverflow.com/questions/17038070/search-for-all-nearest-neighbors-within-a-certain-radius-of-a-point-in-3d