summary: displaying map and layer management
in this exercise you learnt the following:
-ilwis allow the display of many data layer in the same map window. a map window can display only one raster map, but a raster map may be displayed together with many different point, segment and/or polygon map.
-the way in which various data layer are displayed in a map window can be manipulated via the layer management pane.
-in the layer management pane you can select the layer to be displayed, and from which layer you want to obtain information. you can change the display option of a layer, the order of the layer and you can add or remove layer.