message: flag _draw_aerial_image to viewer
diff: @@ -71,6 +71,7 @@ class BaseViewer(Viewer):
  "Alpha of the background plane", 1.0]
  self.map_linewidth = params["Visualization"]["Map"]["XodrLanes"]["Boundaries"]["Linewidth",
  "Linewidth of linestrings", 1.0]
  + self._draw_aerial_image = params["Visualization"]["Map"]["DrawAerialImage", "Flag to draw aerial image behind map", False]
  self.draw_ltl_debug_info = params["Visualization"]["Evaluation"]["DrawLTLDebugInfo",
  "Flag to specify if debug info to ltl evaluators shall be plotted", False]
  @@ -278,6 +279,7 @@ class BaseViewer(Viewer):
  if world.map:
  self.drawMap(world.map.GetOpenDriveMap())
  + if self._draw_aerial_image:
  self.drawMapAerialImage()
  # draw agent goals
  