/// <summary>
/// 计算两个经纬度之间的直接距离(google 算法)
/// </summary>
public static double GetDistanceGoogle(Degree Degree1, Degree Degree2)
{
double radLat1 = radians(Degree1.Latitude);
double radLng1 = radians(Degree1.Longitude);
double radLat2 = radians(Degree2.Latitude);
double radLng2 = radians(Degree2.Longitude);
double s = Math.Acos(Math.Cos(radLat1) * Math.Cos(radLat2) * Math.Cos(radLng1 - radLng2) + Math.Sin(radLat1) * Math.Sin(radLat2));
s = s * EARTH_RADIUS;
s = Math.Round(s * 10000) / 10000;
return s;
}
/// <summary>
/// 计算两个经纬度之间的直接距离
/// </summary>
public static double GetDistance(Degree Degree1, Degree Degree2)
{
double radLat1 = radians(Degree1.Latitude);
double radLat2 = radians(Degree2.Latitude);
double a = radLat1 - radLat2;
double b = radians(Degree1.Longitude) - radians(Degree2.Longitude);
double 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 = s * EARTH_RADIUS;
s = Math.Round(s * 10000) / 10000;
return s;
}
public static Degree ConvertGPSToBaiDu(Degree Degree)
{
try
{
//http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x=106.17559&y=29.36303&callback=BMap.Convertor.cbk_7594
//百度坐标转换API
string path = "http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x=" + Degree.Longitude + "&y=" + Degree.Latitude + "";
//WebClient请求
string strResult = new System.Net.WebClient().DownloadString(path);
string lat = Json.GetFieldStr(strResult, "y");
string lng = Json.GetFieldStr(strResult, "x");
//进行Base64解码
byte[] xBuffer = Convert.FromBase64String(lat);
Degree.Latitude = Convert.ToDouble(Encoding.UTF8.GetString(xBuffer, 0, xBuffer.Length));
byte[] yBuffer = Convert.FromBase64String(lng);
Degree.Longitude = Convert.ToDouble(Encoding.UTF8.GetString(yBuffer, 0, yBuffer.Length));
}
catch { }
return Degree;
}
public static Degree ConvertGPSToSoSo(Degree Degree)
{
try
{
//http://apis.map.qq.com/ws/coord/v1/translate?locations=39.12,116.83;30.21,115.43&type=3&key=OB4BZ-D4W3U-B7VVO-4PJWW-6TKDJ-WPB77
//百度坐标转换API
string path = "http://apis.map.qq.com/ws/coord/v1/translate?locations=" + Degree.Latitude + "," + Degree.Longitude + "&type=1&key=OB4BZ-D4W3U-B7VVO-4PJWW-6TKDJ-WPB77";
//WebClient请求
string strResult = new System.Net.WebClient().DownloadString(path);
var temp = Json.ToObject<SoSo>(strResult);
if (temp != null)
{
Degree.Latitude = temp.locations[0].lat;
Degree.Longitude = temp.locations[0].lng;
}
//string lon = Json.GetFieldStr(strResult, "x");
//string lat = Json.GetFieldStr(strResult, "y");
}
catch { }
return Degree;
}
/// <summary>
/// 以一个经纬度为中心计算出四个顶点
/// </summary>
/// <param name="distance">半径(米)</param>
/// <returns></returns>
public static Degree[] GetDegreeCoordinates(Degree Degree1, double distance)
{
double dlng = 2 * Math.Asin(Math.Sin(distance / (2 * EARTH_RADIUS)) / Math.Cos(Degree1.Longitude));
dlng = degrees(dlng);//转换成角度数
double dlat = distance / EARTH_RADIUS;
dlat = degrees(dlat);//转换成角度数
return new Degree[] { new Degree(Math.Round(Degree1.Longitude + dlng,6), Math.Round(Degree1.Latitude - dlat,6)),//left-top
new Degree(Math.Round(Degree1.Longitude - dlng,6), Math.Round(Degree1.Latitude - dlat,6)),//left-bottom
new Degree(Math.Round(Degree1.Longitude + dlng,6), Math.Round(Degree1.Latitude + dlat,6)),//right-top
new Degree(Math.Round(Degree1.Longitude - dlng,6), Math.Round(Degree1.Latitude + dlat,6)) //right-bottom
};
}