vba GetDistance - how does it work?

Hi,

I have written some vba in regular microstation that uses the geographics engine and calculates ground distance using the GetDistance method between two GeoPoint3d points.

I am getting slightly different results when comparing my vba script results to some other software that I suspect is using a close enough is good enough method.

Does anyone have a good description of how GetDistance is calulating the ground distance?

The projection we are using is:
The MGA zn50 (Map Grid Australia) 

Any help would be much appreciated.

Regards,

Mike

  • IMHO the help file for Getdistance could be better: someone should clarify it based on this sketch

    Regards

    Frank

    since 1985: GIS, CAD, Engineering (Civil)  Senior Consultant : [Autodesk Civil 3D , Esri ArcGIS, VertiGIS: in previous days : Bentley MS V4 - V8i, GeoGraphics, Bentley Map V8i, InRoads,  HHK Geograf, IBr DAVID] :  Dev: [C, C++, .NET, Java, SQL, FORTRAN, UML]
    [direct quote by: http://en.wikipedia.org/wiki/Helmut_Schmidt]: "Wer Kritik übel nimmt, hat etwas zu verbergen"
    Wer Grammatik- und/oder Rechtschreibfehler findet, der darf sie behalten :-)