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Determining the length between geographical locations is currently not implemented in Net Topology Suite (in JTS this is called Orthodromic Distance). This distance is referred to as the ellipsoidal distance. Exactly this type of calculation is needed to provide scalebar functionality.
A C# library exists that performs a calculation to determine this distance, an example of its usage is provided below. Theory can be found in the attached pdf file. The library has been added to delft-tools\shared\geodesy
Imports System
Imports Gavaghan.Geodesy
Public Class VincentyGeodeticProblems
'//Answers is in meters!
Shared Function Distance _
(ByVal Loc1_X As Double, ByVal Loc1_Y As Double, _
byval Loc2_X as Double, byval Loc2_Y as Double) _
as Double
' instantiate the calculator
Dim geoCalc As New GeodeticCalculator()
' select a reference elllipsoid
Dim reference As Ellipsoid = Ellipsoid.WGS84
' set loc 1 coordinates
Dim Loc1 As GlobalCoordinates
Loc1 = New GlobalCoordinates(Loc1_X, Loc1_Y)
' set loc 2 coordinates
Dim Loc2 As GlobalCoordinates
Loc2 = New GlobalCoordinates(Loc2_X, Loc2_Y)
' calculate the geodetic curve
Dim geoCurve As GeodeticCurve = _
geoCalc.CalculateGeodeticCurve(reference, Loc1, Loc2)
return geoCurve.EllipsoidalDistance
End function
End Class
1 Comment
Unknown User (kok_ec)
Some notes: