It's a sort of high-pass filter I guess? Using the curvature of the earth to hig... | Hacker News

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		colechristensen 69 days ago \| parent \| context \| favorite \| on: Show HN: Algorithmically finding the longest line ... It's a sort of high-pass filter I guess? Using the curvature of the earth to highlight local changes in elevation.

tombh 69 days ago [–]

I'm not that familiar with high-pass filters. But yes it's the way it exposes local changes in elevation that is unique. Indeed the heatmap is generated dynamically for every change to the zoom and viewport.

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