58 lines
2.1 KiB
C#
58 lines
2.1 KiB
C#
using NetTopologySuite.Geometries;
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namespace LY.App.Common
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{
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public static class CoordConvert
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{
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/// <summary>
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/// 经纬度转Web墨卡托（单位：米）
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/// </summary>
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/// <param name="longitude">经度</param>
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/// <param name="latitude">纬度</param>
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/// <returns>转换后的位置</returns>
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public static CoordPoint WGS84ToMercator(double lon, double lat)
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{
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var x = lon * Math.PI / 180 * Parameters.LongRadius;
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var param = lat * Math.PI / 180;
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var y = Parameters.LongRadius / 2 * Math.Log((1.0 + Math.Sin(param)) / (1.0 - Math.Sin(param)));
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return new CoordPoint(x, y);
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}
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/// <summary>
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/// 经纬度转Web墨卡托（单位：米）
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/// </summary>
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/// <param name="longitude">经度</param>
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/// <param name="latitude">纬度</param>
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/// <returns>转换后的位置</returns>
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public static CoordPoint WGS84ToMercator(Coordinate coord)
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{
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return WGS84ToMercator(coord.Lon, coord.Lat);
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}
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/// <summary>
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/// Web墨卡托转经纬度
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/// </summary>
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/// <param name="x">X坐标值（单位：米）</param>
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/// <param name="y">Y坐标值（单位：米）</param>
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/// <returns>转换后的位置</returns>
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public static Coordinate MercatorToWGS84(double x, double y)
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{
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var lon = x / Parameters.MercatorLength * 180;
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var lat = y / Parameters.MercatorLength * 180;
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lat = 180 / Math.PI * (2 * Math.Atan(Math.Exp(lat * Math.PI / 180)) - Math.PI / 2);
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return new Coordinate(lon, lat);
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}
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/// <summary>
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/// Web墨卡托转经纬度
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/// </summary>
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/// <param name="x">X坐标值（单位：米）</param>
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/// <param name="y">Y坐标值（单位：米）</param>
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/// <returns>转换后的位置</returns>
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public static Coordinate MercatorToWGS84(CoordPoint point)
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{
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return MercatorToWGS84(point.X, point.Y);
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}
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}
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}
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