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Finding pairs of points within a certain distance [message #83822]

Mon, 08 April 2013 15:56

koensayr
Messages: 1
Registered: April 2013

Junior Member

Hello all,

I have a problem that I'm trying to find an efficient way to solve.

I have a large list of points (on the order of 10^8), that I need to match to a second list of points (on the order of 10^5 points), and find all pairs that are within a certain distance from each other.

The points are located on the surface of the Earth, so they are given in lat/lon coordinates. I have looked at functions like map_2points that can calculate the distance, but brute force way of matching them would be way too slow.

I noticed a user written library in the Documents of Exelis called match_sph that seem to do what I need, but I cannot find where to download it, and the website where that library was hosted seems to be down.

I have also thought about maybe dividing the points into small chunks using something like hist_nd, but was hoping that there might be an existing program for something like this already.

Any help is greatly appreciated,

Thanks!

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		Finding pairs of points within a certain distance By: koensayr on Mon, 08 April 2013 15:56
		Re: Finding pairs of points within a certain distance By: Kenneth Bowman on Tue, 09 April 2013 06:43

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