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)

 

 

前几天做项目用到, 代码贴给大家。

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/// <summary>

        /// 获取当前位置的经纬度

        /// </summary>

        /// <returns></returns>

 

   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);

        }