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12 lines
490 B
JavaScript
12 lines
490 B
JavaScript
const analyzeGPS = async (readings, boundary) => {
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const { booleanPointInPolygon, point, lineString, length } = await import('https://cdn.jsdelivr.net/npm/@turf/turf/+esm')
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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(r => r.loc)
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return path.length < 2 ? 0 :
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Math.round(length(lineString(path), { units: 'kilometers' }) * 100) / 100
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}
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export default analyzeGPS; |