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13 lines
473 B
JavaScript
13 lines
473 B
JavaScript
const analyzeGPS = async (readings, boundary) => {
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const { point, booleanPointInPolygon, lineString, length } = await import('https://esm.sh/@turf/turf');
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const path = readings
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.filter(({ loc }) => booleanPointInPolygon(point(loc), boundary, { ignoreBoundary: true }))
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.sort((a, b) => a.ts - b.ts)
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.map(({ loc }) => loc);
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return path.length < 2
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? 0
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: +length(lineString(path), { units: 'kilometers' }).toFixed(2);
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};
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export default analyzeGPS; |