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13 lines
451 B
JavaScript
13 lines
451 B
JavaScript
const analyzeGPS = async (readings, boundary) => {
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const turf = await import('https://cdn.jsdelivr.net/npm/@turf/turf/+esm');
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const pts = readings
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.filter(r => turf.booleanPointInPolygon(turf.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
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? 0
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: +turf.length(turf.lineString(pts), { units: 'kilometers' }).toFixed(2);
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};
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export default analyzeGPS; |