private void buildFlightPath()
        {
            // Use geometry engine to create a circle around the center of the scene
            Geometry circle = GeometryEngine.EllipseGeodesic(new GeodesicEllipseParameters(centerPoint, 1700, 1700));

            // Create a path around the perimeter of the circle
            routePath = (Polyline)GeometryEngine.Boundary(circle);

            // Store the length of the route for use later
            routeLength = GeometryEngine.Length(routePath);
        }