/// <summary>
/// 百度经纬度转Tile值
/// </summary>
/// <param name="lng">经度</param>
/// <param name="lat">纬度</param>
/// <param name="zoom">缩放级别</param>
/// <returns></returns>
public static TileXY BDlatlng2TileXY(double lng, double lat, int zoom)//x,y百度坐标 zoom 放大级别
{
MercatorPoint p = BDLatLng2Mercator(new GeoLatLng(lat, lng));
double x1 = (p.x / Math.Pow(2, (18 - zoom))) / 256;
double y1 = (p.y / Math.Pow(2, (18 - zoom))) / 256;
x1 = Math.Pow(2, zoom - 26) * (PI * lng * r / 180);
y1 = Math.Pow(2, zoom - 26) * r * Math.Log(Math.Tan(PI * lat / 180) + 1 / (Math.Cos(PI * lat / 180)));
return(new TileXY((int)x1, (int)y1, zoom));
}
/// <summary>
/// 墨卡托转百度经纬度
/// </summary>
/// <param name="p"></param>
/// <returns></returns>
public static GeoLatLng Mercator2BDLatLng(MercatorPoint p)
{
double[] arr = null;
MercatorPoint np = new MercatorPoint(Math.Abs(p.x), Math.Abs(p.x));
for (var i = 0; i < array3.Length; i++)
{
if (np.y >= array3[i])
{
arr = array4[i];
break;
}
}
double[] res = BDConvertor(np.x, np.y, arr);
return(new GeoLatLng(res[1], res[0]));
}
