private static Point GetWgs84Point(Point point)
{
if (point.SRID == 4326)
{
return(point);
}
var cs = CoordinateSystemExtend.Get(point.SRID);
if (cs is GeographicCoordinateSystem)
{
return(CoordinateTransformation.TransformPoint(point, GeographicCoordinateSystem.WGS84, false));
}
else
{
return(CoordinateTransformation.TransformPoint(point, GeographicCoordinateSystem.WGS84, false));
}
}
public static double Distance(Point point1, Point point2)
{
//一个有坐标系一个没有坐标系
//if (point1.CoordinateSystem != null && point2.CoordinateSystem == null)
//{
// point2 = point2.Clone() as Point;
// point2.SetCoordinateSystem(point1.CoordinateSystem, false);
//}
//else if (point1.CoordinateSystem == null && point2.CoordinateSystem != null)
//{
// point1 = point1.Clone() as Point;
// point1.SetCoordinateSystem(point2.CoordinateSystem, false);
//}
////两个坐标系不同
//else if (point1.CoordinateSystem != point2.CoordinateSystem)
//{
// if(point1.CoordinateSystem is ProjectedCoordinateSystem)
// point2 = CoordinateSystems.Transformations.CoordinateTransformation.TransformPoint(point2, point1.CoordinateSystem, false);
//}
//地理坐标系
//if (point1.CoordinateSystem is GeographicCoordinateSystem)
//{
//如果两个都没有坐标系，直接求欧氏距离
if (point1.SRID == 0 && point2.SRID == 0)
{
double x = point1.X - point2.X;
double y = point1.Y - point2.Y;
return(Math.Sqrt(x * x + y * y));
}
////一个有坐标系一个没有坐标系
//if (point1.CoordinateSystem != null && point2.CoordinateSystem == null)
//{
// point2 = point2.Clone() as Point;
// point2.SetCoordinateSystem(point1.CoordinateSystem, false);
//}
//else if (point1.CoordinateSystem == null && point2.CoordinateSystem != null)
//{
// point1 = point1.Clone() as Point;
// point1.SetCoordinateSystem(point2.CoordinateSystem, false);
//}
//else
//{
// point1 = GetWgs84Point(point1);
// point2 = GetWgs84Point(point2);
//}
if (!point1.SRID.Equals(point2.SRID))
{
throw new Exception("坐标系不一致");
}
var cs = CoordinateSystemExtend.Get(point1.SRID);
if (cs is IGeographicCoordinateSystem)
{
return(CalculateGeodeticCurve(
(cs as IGeographicCoordinateSystem).HorizontalDatum.Ellipsoid as Ellipsoid,
point1, point2).Length);
}
else
{
point1 = CoordinateTransformation.TransformPoint(point1, 4326);
point2 = CoordinateTransformation.TransformPoint(point2, 4326);
return(CalculateGeodeticCurve(Ellipsoid.WGS84, point1, point2).Length);
}
//double lat1 = point1.Latitude;
//double lat2 = point2.Latitude;
//double lng1 = point1.Longitude;
//double lng2 = point2.Longitude;
//var radLat1 = lat1 * Math.PI / 180.0;
//var radLat2 = lat2 * Math.PI / 180.0;
//var a = radLat1 - radLat2;
//var b = lng1 * Math.PI / 180.0 - lng2 * Math.PI / 180.0;
//var s = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) + Math.Cos(radLat1) * Math.Cos(radLat2) * Math.Pow(Math.Sin(b / 2), 2)));
//s *= CoordinateSystem.WGS84.HorizontalDatum.Ellipsoid.SemiMajorAxis; //6378137;
////s = Math.Round(s * 10000) / 10000;
//return s;
//}
}