windows phone 7 定位（获取经纬度）,然后找到经纬度所在的位置(城市信息)

期盼死亡的小丑

　　
　　
　　前几天做项目用到, 代码贴给大家。



///
/// 获取当前位置的经纬度
///
///
public static double[] GetLocationProperty()
{
double[] latLong = new double[2];
GeoCoordinateWatcher watcher = new GeoCoordinateWatcher();
watcher.TryStart(false,TimeSpan.FromMilliseconds(1000));
GeoCoordinate coord = watcher.Position.Location;
if (coord.IsUnknown != true)
{
latLong[0] = coord.Latitude;
latLong[1] = coord.Longitude;
}
return latLong;

}

#region 两个经纬度之差求的距离
private const double EARTH_RADIUS = 6378.137;
private static double rad(double d)
{
return d * Math.PI / 180.0;
}
public static double GetDistance(double lat1, double lng1, double lat2, double lng2)
{
double radLat1 = rad(lat1);
double radLat2 = rad(lat2);
double a = radLat1 - radLat2;
double b = rad(lng1) - rad(lng2);
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;
}
#endregion
//URL接口来自诺基亚地图
public static Uri Get_CityNameOnMap(double slatitude, double slongitude)
{
string urlString = "http://loc.desktop.maps.svc.ovi.com/geocoder/rgc/1.0?" + "lat=" + slatitude + "&long=" + slongitude + "&output=json";
return new Uri(urlString, UriKind.RelativeOrAbsolute);
}