public GeodeticMeasurement(GeodeticCurve averageCurve, double elevationChangeMeters)
{
double ellipsoidalDistanceMeters = averageCurve.EllipsoidalDistanceMeters;
this.AverageCurve = averageCurve;
this.ElevationChangeMeters = elevationChangeMeters;
this.PointToPointDistanceMeters = Math.Sqrt((ellipsoidalDistanceMeters * ellipsoidalDistanceMeters) + (elevationChangeMeters * elevationChangeMeters));
}
public double CalculateDistance()
{
GeodeticCalculator geoCalc = new GeodeticCalculator();
Ellipsoid reference = Ellipsoid.WGS84;
double lat1 = (double)_position1.Latitude;
double lon1 = (double)_position1.Longitude;
GlobalCoordinates position1 = new GlobalCoordinates(Angle.FromDegrees(lat1), Angle.FromDegrees(lon1));
double lat2 = (double)_position2.Latitude;
double lon2 = (double)_position2.Longitude;
GlobalCoordinates position2 = new GlobalCoordinates(Angle.FromDegrees(lat2), Angle.FromDegrees(lon2));
GeodeticCurve geoCurve = geoCalc.CalculateGeodeticCurve(reference, position1, position2);
double ellipseKilometers = geoCurve.EllipsoidalDistanceMeters / 1000;
double ellipseMiles = ellipseKilometers * 0.621371192;
return(ellipseMiles);
}
internal GeodeticMeasurement CalculateGeodeticMeasurement(Ellipsoid refEllipsoid, GlobalPosition start, GlobalPosition end, double tolerance)
{
// get the coordinates
GlobalCoordinates startCoords = start.Coordinates;
GlobalCoordinates endCoords = end.Coordinates;
// calculate elevation differences
double elev1 = start.ElevationMeters;
double elev2 = end.ElevationMeters;
double elev12 = (elev1 + elev2) / 2.0;
double phi1 = startCoords.Latitude.Radians;
double phi2 = endCoords.Latitude.Radians;
double phi12 = (phi1 + phi2) / 2.0;
double refA = refEllipsoid.SemiMajorAxisMeters;
double f = refEllipsoid.Flattening;
double a = refA + elev12 * (1.0 + f * Math.Sin(phi12));
Ellipsoid ellipsoid = Ellipsoid.FromAAndF(a, f);
GeodeticCurve averageCurve = CalculateGeodeticCurve(ellipsoid, startCoords, endCoords, tolerance);
return(new GeodeticMeasurement(averageCurve, elev2 - elev1));
}
