Layer Management
The layer management window allows you to turn layers on and off, change the order of layers, modify their settings, and so forth. Two displays are available for layer management: hierarchical display and list display.
The hierarchical display shows the layers logically grouped together in a tree structure. The hierarchy is defined by the JMap administrator. Each group of layers can be turned on or off. Layer order is determined by the system administrator and does not necessarily reflect the order in which layers are displayed on the map. When a group is turned on, all the visible layers it contains are displayed. When a group is turned off, none of the layers it contains and none of the layers in its sub-groups are displayed. Turning a group on or off does not affect the visibility of the layers it contains.
The list display presents the map layers in an organized list; all layers are displayed at the same level. The order of the layers in the list reflects the order according to which they are displayed on the map. The layer at the bottom of the list is the first one drawn on the map, and the layer at the top is the last one drawn. This interface allows you to change layer order by dragging a layer up or down in the list.
