Une des fonctions les plus communes de la géographie et des systèmes modernes, c'est le calcul de la distance géographique entre deux coordonnées de Longitude et de Latitude. Il n'y a aucune nécessité de grande connaissance en trigonométrie pour arriver à se genre de calcul dans le format qu'on le souhaite, Km, Miles ou Miles Nautiques. Ainsi, si vous savez les coordonnées suivantes :
Ville | Latitude | Longitude |
---|---|---|
Montréal | 45 31N | 73 34O |
Paris | 48 50N | 2 20E |
A l'aide du code source Visual Basic .NET suivant, vous trouvez la réponse que vous souhaitez :
- Imports System
-
- Module Module1
-
- Sub Main()
- Console.WriteLine("Distance entre Montréal et Paris en Km: " & Convert.ToString(CoordToDeltaKm(45, 31, "N", 73, 34, "O", 48, 50, "N", 2, 20, "E")))
- Console.WriteLine("Distance entre Montréal et Paris en Miles: " & Convert.ToString(CoordToDeltaStatuteMiles(45, 31, "N", 73, 34, "O", 48, 50, "N", 2, 20, "E")))
- Console.WriteLine("Distance entre Montréal et Paris en Miles Nautique: " & Convert.ToString(CoordToDeltaNauticalMiles(45, 31, "N", 73, 34, "O", 48, 50, "N", 2, 20, "E")))
- End Sub
-
- Function CoordToDeltaKm( _
- ByVal Q1Latitude As Double, ByVal Q1LatiDeg As Double, ByVal Q1LatiDirection As Char, _
- ByVal Q1Longitude As Double, ByVal Q1LongDeg As Double, ByVal Q1LongDirection As Char, _
- ByVal Q2Latitude As Double, ByVal Q2LatiDeg As Double, ByVal Q2LatiDirection As Char, _
- ByVal Q2Longitude As Double, ByVal Q2LongDeg As Double, ByVal Q2LongDirection As Char)
- Dim a1, b1, a2, b2, RawDelta As Double
- a1 = (Q1Latitude + (Q1LatiDeg / 60)) * Math.PI / 180
- If Q1LatiDirection = "N" Then
- a1 = -a1
- End If
- b1 = (Q1Longitude + (Q1LongDeg / 60)) * Math.PI / 180
- If Q1LongDirection = "O" Then
- b1 = -b1
- End If
- a2 = (Q2Latitude + (Q2LatiDeg / 60)) * Math.PI / 180
- If Q2LatiDirection = "N" Then
- a2 = -a2
- End If
- b2 = (Q2Longitude + (Q2LongDeg / 60)) * Math.PI / 180
- If Q2LongDirection = "O" Then
- b2 = -b2
- End If
- RawDelta = Math.ACos(Math.Cos(a1) * Math.Cos(b1) * Math.Cos(a2) * Math.Cos(b2) + Math.Cos(a1) * Math.Sin(b1) * Math.Cos(a2) * Math.Sin(b2) + Math.Sin(a1) * Math.Sin(a2))
- CoordToDeltaKm = RawDelta * 6378.0
- End Function
-
- Function CoordToDeltaStatuteMiles( _
- ByVal Q1Latitude As Double, ByVal Q1LatiDeg As Double, ByVal Q1LatiDirection As Char, _
- ByVal Q1Longitude As Double, ByVal Q1LongDeg As Double, ByVal Q1LongDirection As Char, _
- ByVal Q2Latitude As Double, ByVal Q2LatiDeg As Double, ByVal Q2LatiDirection As Char, _
- ByVal Q2Longitude As Double, ByVal Q2LongDeg As Double, ByVal Q2LongDirection As Char)
- Dim a1, b1, a2, b2, RawDelta As Double
- a1 = (Q1Latitude + (Q1LatiDeg / 60)) * Math.PI / 180
- If Q1LatiDirection = "N" Then
- a1 = -a1
- End If
- b1 = (Q1Longitude + (Q1LongDeg / 60)) * Math.PI / 180
- If Q1LongDirection = "O" Then
- b1 = -b1
- End If
- a2 = (Q2Latitude + (Q2LatiDeg / 60)) * Math.PI / 180
- If Q2LatiDirection = "N" Then
- a2 = -a2
- End If
- b2 = (Q2Longitude + (Q2LongDeg / 60)) * Math.PI / 180
- If Q2LongDirection = "O" Then
- b2 = -b2
- End If
- RawDelta = Math.ACos(Math.Cos(a1) * Math.Cos(b1) * Math.Cos(a2) * Math.Cos(b2) + Math.Cos(a1) * Math.Sin(b1) * Math.Cos(a2) * Math.Sin(b2) + Math.Sin(a1) * Math.Sin(a2))
- CoordToDeltaStatuteMiles = RawDelta * 3963.1
- End Function
-
-
- Function CoordToDeltaNauticalMiles( _
- ByVal Q1Latitude As Double, ByVal Q1LatiDeg As Double, ByVal Q1LatiDirection As Char, _
- ByVal Q1Longitude As Double, ByVal Q1LongDeg As Double, ByVal Q1LongDirection As Char, _
- ByVal Q2Latitude As Double, ByVal Q2LatiDeg As Double, ByVal Q2LatiDirection As Char, _
- ByVal Q2Longitude As Double, ByVal Q2LongDeg As Double, ByVal Q2LongDirection As Char)
- Dim a1, b1, a2, b2, RawDelta As Double
- a1 = (Q1Latitude + (Q1LatiDeg / 60)) * Math.PI / 180
- If Q1LatiDirection = "N" Then
- a1 = -a1
- End If
- b1 = (Q1Longitude + (Q1LongDeg / 60)) * Math.PI / 180
- If Q1LongDirection = "O" Then
- b1 = -b1
- End If
- a2 = (Q2Latitude + (Q2LatiDeg / 60)) * Math.PI / 180
- If Q2LatiDirection = "N" Then
- a2 = -a2
- End If
- b2 = (Q2Longitude + (Q2LongDeg / 60)) * Math.PI / 180
- If Q2LongDirection = "O" Then
- b2 = -b2
- End If
- RawDelta = Math.ACos(Math.Cos(a1) * Math.Cos(b1) * Math.Cos(a2) * Math.Cos(b2) + Math.Cos(a1) * Math.Sin(b1) * Math.Cos(a2) * Math.Sin(b2) + Math.Sin(a1) * Math.Sin(a2))
- CoordToDeltaNauticalMiles = RawDelta * 3443.9
- End Function
-
- End Module
on obtiendra le résultat suivant :
Distance entre Montréal et Paris en Km: 5510.16761889Distance entre Montréal et Paris en Miles: 3423.85470217
Distance entre Montréal et Paris en Miles Nautique: 2975.30044884
Dernière mise à jour : Samedi, le 22 octobre 2016