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13 lines
482 B
JavaScript
13 lines
482 B
JavaScript
const analyzeGPS = async (readings, boundary) => {
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const { booleanPointInPolygon: inside, 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 }) => inside(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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if (path.length < 2) return 0
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return +length(lineString(path), { units: 'kilometers' }).toFixed(2)
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}
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export default analyzeGPS; |