The visualization is tight-knit to the phenomenon simulation, therefore both are started together. Basically the Sensor World Vis Controller draws images of the value raster of the composed phenomenon in one layer in specified time steps. To track the movement of the sensors a Sensor Position Observer is started at the same time and listens to the position messages. These postions are saved as geometries in a list and are added as the second layer to the drawed image. All images are saved on the hard disk and will be added to a quick time video after the visualization runtime.