更新:使用此處的示例 - http://code.msdn.microsoft.com/wpapps/Location-sample-f11aa4e7並添加海拔高度讀數我獲得與我的代碼相同的內容。準確度不佳正在減少50英尺。在720(正確)和300英尺之間來回移動意味着錯誤。我只是看不到在哪裏...Windows phone 8 gps /海拔高度問題
我開始爲windows phone 8製作一個GPS跟蹤應用程序,但有些事情會發生干擾。在我的應用程序中(和示例位置應用程序中),我得到了一些正確的讀數,而其他的讀數沒有。一般來說,高度在〜95和〜215之間來回跳動(215是正確的)。我得到的距離也非常不準確,當坐在我的辦公桌前或在外面走動時,很快跳到了幾英里。
我不確定要發佈什麼代碼,因爲它與示例代碼相同。如果您認爲我應該發佈另一個相關版塊,請告訴我,我將添加它。
double maxSpeed = 0.0;
double maxAlt = -9999999.0;
double minAlt = 9999999.0;
double curDistance = 0.0;
GeoCoordinate lastCoord = null;
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
if ((bool)IsolatedStorageSettings.ApplicationSettings["LocationConsent"] != true)
{
// The user has opted out of Location.
return;
}
if (App.Geolocator == null)
{
// Use the app's global Geolocator variable
App.Geolocator = new Geolocator();
}
App.Geolocator.DesiredAccuracy = PositionAccuracy.High;
//App.Geolocator.MovementThreshold = 1; // The units are meters.
App.Geolocator.ReportInterval = 1000;
//App.Geolocator.DesiredAccuracyInMeters = 50;
App.Geolocator.StatusChanged += geolocator_StatusChanged;
App.Geolocator.PositionChanged += geolocator_PositionChanged;
/*
geolocator = new Geolocator();
geolocator.DesiredAccuracy = PositionAccuracy.High;
//geolocator.MovementThreshold = 1; // The units are meters.
geolocator.ReportInterval = 1000;
geolocator.StatusChanged += geolocator_StatusChanged;
geolocator.PositionChanged += geolocator_PositionChanged;
*
* */
logging = true;
startTime = DateTime.Now;
}
public static GeoCoordinate ConvertGeocoordinate(Geocoordinate geocoordinate)
{
return new GeoCoordinate
(
geocoordinate.Latitude,
geocoordinate.Longitude,
geocoordinate.Altitude ?? Double.NaN,
geocoordinate.Accuracy,
geocoordinate.AltitudeAccuracy ?? Double.NaN,
geocoordinate.Speed ?? Double.NaN,
geocoordinate.Heading ?? Double.NaN
);
}
void geolocator_PositionChanged(Geolocator sender, PositionChangedEventArgs args)
{
Dispatcher.BeginInvoke(() =>
{
if (lastCoord == null)
{
lastCoord = ConvertGeocoordinate(args.Position.Coordinate);
}
DateTime currentTime = DateTime.Now;
TimeSpan totalTime = currentTime - startTime;
timeValue.Text = totalTime.ToString(@"hh\:mm\:ss");
System.Diagnostics.Debug.WriteLine(args.Position.Coordinate.Altitude.ToString());
GeoCoordinate thisLocation = ConvertGeocoordinate(args.Position.Coordinate);
if (true) //units check true = standard
{
double speed = (double)thisLocation.Speed;
speed *= 2.23694; //m/s -> mph
speedValue.Text = speed.ToString("0");
double alt = (double)thisLocation.Altitude;
if (alt > maxAlt)
{
maxAlt = alt;
}
if (alt < minAlt)
{
minAlt = alt;
}
/*
double currentAlt = (maxAlt - minAlt);
currentAlt *= 3.28084; //m -> ft
* */
alt *= 3.28084;
altValue.Text = alt.ToString("0");
double distance = thisLocation.GetDistanceTo(lastCoord);
curDistance += distance;
distance = curDistance * 0.000621371; // m -> miles
distanceValue.Text = distance.ToString("0.00");
distanceUnits.Text = "(mi)";
speedUnits.Text = "(mph)";
altUnits.Text = "(ft)";
}
});
}
編輯:我沒有提到,但作爲一個fyi速度是非常好的。緯度/長度通常非常接近我的位置,所以我不認爲這是硬件問題。
更新:當在調試器停止來檢查值,而不是僅僅將其打印,它給出了這樣的:
海拔=發生內部錯誤而評價方法Windows.Devices.Geolocation.Geocoordinate.get_Altitude()
我試圖尋找這一點,但這個錯誤是無處可在互聯網上找到...
該文件指出,高度和其他幾個人都不能保證,但同時也表示,值如果不存在,它將爲空。我檢查,並且它從不爲空。它總是打印一個值,要麼是正確的,要麼是400英尺。
UPDATE:示例代碼:
void geolocator_PositionChanged(Geolocator sender, PositionChangedEventArgs args)
{
System.Diagnostics.Debug.WriteLine(args.Position.Coordinate.Altitude.ToString());
if (!App.RunningInBackground)
{
Dispatcher.BeginInvoke(() =>
{
LatitudeTextBlock.Text = args.Position.Coordinate.Latitude.ToString("0.00");
LongitudeTextBlock.Text = args.Position.Coordinate.Longitude.ToString("0.00");
});
}
else
{
Microsoft.Phone.Shell.ShellToast toast = new Microsoft.Phone.Shell.ShellToast();
toast.Content = args.Position.Coordinate.Latitude.ToString("0.00");
toast.Title = "Location: ";
toast.NavigationUri = new Uri("/MainPage.xaml", UriKind.Relative);
toast.Show();
}
}
我有同樣的經驗,但不是一個解決方案。 – Guldan