Brian Rockwell presents a quick overview showing how to align a device’s sensors with your app’s orientation:

The sensors supported by Windows Store apps offer a powerful way to spice up your app’s functionality. Sensors let your app know the relationship between the device and the physical world around it; the direction, orientation, and movement in those realms. These sensors can help make your game, augmented reality app, or utility app more useful and interactive by providing a unique form of input such as using the motion of the tablet to arrange the characters on the screen or to simulate the user being in a cockpit with the device as the steering wheel. 

Brian gives us a bit of code to calculate the gyrometer axes based on the app’s current display orientation:

private void ReadingChanged(object sender, GyrometerReadingChangedEventArgs e)
{
    GyrometerReading reading = e.Reading;  
    
    // Calculate the gyrometer axes based on
    // the current display orientation.
    DisplayInformation displayInfo = DisplayInformation.GetForCurrentView();
    switch (displayInfo.CurrentOrientation) 
    { 
        case DisplayOrientations.Landscape: 
            x_Axis = reading.AngularVelocityX;
            y_Axis = reading.AngularVelocityY;
            z_Axis = reading.AngularVelocityZ;
            break;
        case DisplayOrientations.Portrait: 
            x_Axis = reading.AngularVelocityY;
            y_Axis = -1 * reading.AngularVelocityX;
            z_Axis = reading.AngularVelocityZ;
            break; 
        case DisplayOrientations.LandscapeFlipped: 
            x_Axis = -1 * reading.AngularVelocityX;
            y_Axis = -1 * reading.AngularVelocityY;
            z_Axis = reading.AngularVelocityZ;
            break; 
        case DisplayOrientations.PortraitFlipped: 
            x_Axis = -1 * reading.AngularVelocityY;
            y_Axis = reading.AngularVelocityX;
            z_Axis = reading.AngularVelocityZ;
            break; 
     } 
    
    
    // Update the UI...
}

More after the jump.

Aligning sensors with your app’s orientation