BingMapsLayer worldLayer;
        private void WpfMap_Loaded(object sender, RoutedEventArgs e)
        {
      Canvas child = VisualTreeHelper.GetChild(wpfMap1, 0) as Canvas;
            child = VisualTreeHelper.GetChild(child, 0) as Canvas;

            child.RenderTransformOrigin = new System.Windows.Point(0, 0);
            child.RenderTransform = new RotateTransform(20);

            GeoTiffRasterLayer worldLayer = new GeoTiffRasterLayer(@"..\..\sampledata\data\world.tif");
            wpfMap1.MapUnit = GeographyUnit.DecimalDegree;
            wpfMap1.CurrentExtent = new RectangleShape(-180, 90, 180, -90);
            LayerOverlay worldOverlay = new LayerOverlay();

            worldOverlay.Layers.Add(new BackgroundLayer(new GeoSolidBrush(GeoColor.GeographicColors.ShallowOcean)));
            worldOverlay.Layers.Add("WorldLayer", worldLayer);
            worldOverlay.TileBuffer = 2;

            wpfMap1.Overlays.Add("WorldOverlay", worldOverlay);
            wpfMap1.Refresh();
        }