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