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I currently use a modified hilbert curve implementation for nn searches, will check this out to see how it compares.

my use case is here: https://geocode.xyz/2451481561372 -> https://geocode.xyz/45.17310,-75.62670 / https://geocode.xyz/2451481561373 -> https://geocode.xyz/45.17300,-75.62670

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How do you deal with false negatives when using Hilbert curves for nearest neighbor searches? Based on my limited understanding, points close on space can be far from each other on the curve. Do you use multiple curves or something?

I use two curves.

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