JamesLMilner / Cheap Ruler Go
📏 cheapruler in Go: fast geodesic measurements
Stars: ✭ 176
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Cheapruler (Go)
"A collection of very fast approximations to common geodesic measurements. Useful for performance-sensitive code that measures things on a city scale.
The approximations are based on an FCC-approved formula of ellipsoidal Earth projection. For distances under 500 kilometers and not on the poles, the results are very precise — within 0.1% margin of error compared to Vincenti formulas, and usually much less for shorter distances."
Usage
Here is an example of doing a distance measurement in kilometers, with a ruler Latitude of 32.8351:
cr, _ := NewCheapruler(32.8351, "kilometers")
pointA := []float64{-96.920341, 32.838261}
pointB := []float64{-96.920421, 32.838295}
dist := cr.Distance(pointA, pointB)
fmt.Println(dist)
// Output: 0.008385790760648736
Acknowledgements
Based on Vladimir Agafonkin's JavaScript library cheapruler
License
ISC License
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