How to find the nearby sampling stations

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Leon on 11 Apr 2021
Commented: dpb on 16 Apr 2021
I have millions of samping sations, my goal is to find the nearby stations with a certain distance threshold. What is the best way to do it based on the longitude and latitude information?
It seems that calculating the stations between each of them is extremely time-consuming.
dpb on 12 Apr 2021
I would presume there are tools in the Mapping Toolbox (which I don't have) similar to pdist2 in base product, but I really don't know much at all about what is available.

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Answers (1)

Shadaab Siddiqie
Shadaab Siddiqie on 16 Apr 2021
From my understanding you want to speed up the process of finding the nearest location. You can use pdist2 to find pair-wise distance of all the point in a range or you can also use dsearchn to find nearest point.
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dpb on 16 Apr 2021
Neither of which address that OP's coordinates are in lat, long, not x,y,z...

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