Location not getting correctly.

Hi,

I’m trying to develop a driver tracking application. At first I was using just Android’s LocationManager API with GPS as the only provider. The output was not so perfect, it had jumps all over my route.

It was then I tried using this library. But I lost a lot of locations after that.

In this picture Red line shows my route towards destination and Green line shows my route back to where I started. And you can clearly see from the picture that only a few point are plotted. But out of my surprise I got the exact point from where I took the U turn.

NB: The vehicle was continuously moving throughout the route.

My system requires a foreground notification and I’m writing my code on that service. Here is what I included in the code: ` public class LocationService extends Service implements LocationServiceInterface { …

private GeohashRTFilter m_geoHashRTFilter;

@Override
public void onCreate() {
    super.onCreate();

m_geoHashRTFilter = new GeohashRTFilter(Utils.GEOHASH_DEFAULT_PREC, Utils.GEOHASH_DEFAULT_MIN_POINT_COUNT); startForeground(KEY_NOTIFICATION_ID, getForegroundNotification); }

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    ServicesHelper.addLocationServiceInterface(this);
    ServicesHelper.getLocationService(this, value -> {
        if (value.IsRunning()) {
            return;
        }
        m_geoHashRTFilter.stop();
        value.stop();
        KalmanLocationService.Settings settings =
                new KalmanLocationService.Settings(Utils.ACCELEROMETER_DEFAULT_DEVIATION,
                        Utils.GPS_MIN_DISTANCE,
                        Utils.GPS_MIN_TIME,
                        Utils.GEOHASH_DEFAULT_PREC,
                        Utils.GEOHASH_DEFAULT_MIN_POINT_COUNT,
                        Utils.SENSOR_DEFAULT_FREQ_HZ,
                        null, false, Utils.DEFAULT_VEL_FACTOR, Utils.DEFAULT_VEL_FACTOR);
        value.reset(settings); 
        value.start();
    });
    return START_STICKY;
}

@Override public void locationChanged(Location location) { if (location != null ) { DataManager.getInstance(LocationService.this) .saveDeviceTracking(location.getLatitude(), location.getLongitude()); } } … }`

Please help me if I’m missing anything in this.

[farfromrefug]

@Lezh1k about the (0,0) coordinates. I was getting those too. For me the reason was that i was using an emulator without sensors. So i was only getting sdi from onLocationChange and so the KalmanFilter was never “initialized” with a Sensor event. I fixed it as explained here https://github.com/maddevsio/mad-location-manager/issues/52#issuecomment-533188474

[thxmxx]

Check your GPS frequency I bet it’s 1Hz or bellow and you are not having enough points GEOHASH_DEFAULT_MIN_POINT_COUNT for the precision GEOHASH_DEFAULT_PREC.

Try walking instead of driving a car… lol