private static bool TryGetTransformation(Coordinate c1, Coordinate c2, out ICoordinateTransformation transformation)
{
var result = false;
transformation = null;
int utmZone1 = GetUtmZone(c1.Longitude);
int utmZone2 = GetUtmZone(c2.Longitude);
bool isSouth1 = c1.Latitude < 0;
bool isSouth2 = c2.Latitude < 0;
result = (Math.Abs((utmZone1 - utmZone2))) < 2 && (isSouth1 == isSouth2);
if (!result)
{
return(false);
}
var wgs = GeographicCoordinateSystem.WGS84;
var utm = ProjectedCoordinateSystem.WGS84_UTM(utmZone1, !isSouth1);
transformation = new CoordinateTransformationFactory().CreateFromCoordinateSystems(wgs, utm);
return(result);
}
public bool TryCalculate(Coordinate c1, Coordinate c2, Units unit, out double distance)
{
distance = 0;
if (TryGetTransformation(c1, c2, out ICoordinateTransformation transformation))
{
var geoCoord1 = Transform(c1, transformation);
var geoCoord2 = Transform(c2, transformation);
var point1 = _factory.CreatePoint(geoCoord1);
var point2 = _factory.CreatePoint(geoCoord2);
distance = DistanceOp.Distance(point1, point2);
distance = unit == Units.Meters ? distance : Constants.MilesPerMeter * distance;
return(true);
}
return(false);
}
private static GeoCoordinate ToGeoCoordinate(Coordinate c)
{
return(new GeoCoordinate(c.Longitude, c.Latitude));
}
private static GeoCoordinate Transform(Coordinate c, ICoordinateTransformation transformation)
{
return(transformation.MathTransform.Transform(ToGeoCoordinate(c)));
}
