更新:使用此处的样本 - http://code.msdn.microsoft.com/wpapps/Location-sample-f11aa4e7并添加高度读数,我得到与我的代码相同的东西。准确性差50英尺。在720(正确)和300英尺之间来回走动意味着出了问题。我只是看不到...
我开始为Windows Phone 8制作GPS跟踪应用程序,但有些事情会变得混乱。在我的应用程序中,(以及在示例位置应用程序中)我得到一些正确的读数,而其他读数则不正确。通常,高度在~95和~215之间来回跳跃(215是正确的)。我得到的距离也非常不准确,坐在我的办公桌前或在外面走动时快速跳到几英里。
我不确定要发布的代码,因为它与示例代码完全相同。如果您认为还有其他相关部分,我应该发布,让我知道,我会添加它。
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)";
}
});
}
编辑:我没有提及,但速度非常好,因为fyi。 lat / long与我的位置非常接近,所以我不认为这是硬件问题。
更新:在调试器中停止检查值而不是仅打印它时,它会给出:
Altitude =评估方法时出现内部错误Windows.Devices.Geolocation.Geocoordinate.get_Altitude()
我试图搜索这个,但错误无法在互联网上找到......
文档说明高度和其他一些不保证,但它也表示如果不存在,该值将为null。我检查,它永远不会为空。它总是打印一个值,正确或约400英尺。
更新:示例代码:
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();
}
}
答案 0 :(得分:1)
您可能也会看到不同的问题,但GPS高度不是很可靠。我有几个Garmin设备,他们都到处乱跳。你真的需要一个适合高度精度的晴雨表。 以下是GPS态度不准确性GPS Elevation
的链接