ArcGisARView with compass not point to nord

[simone-vitale-overit]

Hello community,

I'm working on an Android App that use an ArcGISARView and to get the position of the device, I'm using

ArLocationDataSource

configured in this way:

var criteria = Criteria()
criteria.powerRequirement = Criteria.POWER_HIGH
criteria.accuracy = Criteria.ACCURACY_FINE
criteria.isSpeedRequired = true
criteria.isAltitudeRequired = false
criteria.isBearingRequired = true
criteria.isCostAllowed = true

val locationDataSource = ArLocationDataSource(this, criteria, 1000, 1.0F)

arSceneView.locationDataSource = locationDataSource

The localization work correctly, but in my Scene I show a Compass of the ESRI toolkit that I initialised in this way:

compass = Compass(this)
compass!!.isAutoHide = false
compass!!.addToGeoView(arSceneView.sceneView)

I have a strange behaviour by the compass, because not point on the north but I have a rotation of 20/30 degree respect to the real position of north, but not of the map, only of the compass, because the camera points to the real position in the world.

Someone have any idea of why I have this strange behaviour?

[simone-vitale-overit · Accepted solution]

I found a solution by creating a custom LocationDatasource and making a method to manage what I have received onSensorChanged:

override fun onSensorChanged(event: SensorEvent) {
    val type = event.sensor.type
    if (type == Sensor.TYPE_ACCELEROMETER) {
        gravity = lowPassFilter(event.values.clone(), gravity)
    }

    if (type == Sensor.TYPE_MAGNETIC_FIELD) {
        geomagnetic = lowPassFilter(event.values.clone(), geomagnetic)
    }

    if(type == Sensor.TYPE_ROTATION_VECTOR)
    {
        val currentRotation = event.values
        val rotationMatrix = FloatArray(9)
        SensorManager.getRotationMatrixFromVector(rotationMatrix, currentRotation)
    }

    if(gravity != null && geomagnetic != null)
    {
        val R = FloatArray(9)
        val outR = FloatArray(9)
        val I = FloatArray(9)

        val success = SensorManager.getRotationMatrix(R,I, gravity, geomagnetic)
        if(success)
        {
            val orientation = FloatArray(3)
            SensorManager.remapCoordinateSystem(R, SensorManager.AXIS_X, SensorManager.AXIS_Z, outR)
            SensorManager.getOrientation(outR, orientation)
            val azimut = orientation[0]
            val azimutInDegree = (Math.toDegrees(azimut.toDouble()))%360
            updateHeading(azimutInDegree)
        }
    }
}

 I hope that this solution help someone that has the same problem.