Πώς να υπολογίσετε το Haversine
Τι είναι το Haversine;
The Haversine formula calculates the great-circle distance between two points on a sphere (like Earth) from their latitude and longitude. It is used in navigation, mapping, and GPS applications.
Τύπος
a = sin²(Δφ/2) + cos(φ₁)cos(φ₂)sin²(Δλ/2); d = 2R·arcsin(√a)
- φ₁, φ₂
- latitude of points 1 and 2 (radians)
- Δφ
- difference in latitude (radians)
- λ₁, λ₂
- longitude of points 1 and 2 (radians)
- Δλ
- difference in longitude (radians)
- R
- Earth radius (km (≈6371)) — or miles (≈3959)
- d
- great-circle distance (km or miles)
Οδηγός βήμα προς βήμα
- 1a = sin²(Δlat/2) + cos(lat₁)cos(lat₂)sin²(Δlon/2)
- 2c = 2×atan2(√a, √(1−a))
- 3d = R × c, where R = 6371 km (Earth radius)
- 4Gives shortest path along Earth's surface
Worked Examples
Εισαγωγή
London (51.5°N,0.1°W) to New York (40.7°N,74°W)
Αποτέλεσμα
≈ 5,570 km / 3,461 miles
Εισαγωγή
Paris to Berlin
Αποτέλεσμα
≈ 878 km
Frequently Asked Questions
What is a great circle?
The shortest path between two points on a sphere. On Earth, that's the shortest route between two locations.
Why not use Euclidean distance for GPS?
Earth is curved (sphere). Euclidean distance (straight line) ignores the curvature and gives incorrect results.
Is haversine the only way to calculate geographic distance?
No, but it's accurate, numerically stable, and avoids singularity issues of other formulas.
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