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)
转自:http://www.cnblogs.com/qingci/archive/2011/10/20/2218910.html
/// <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); } |