I have been reading the information provided in the screenshots section.
It appears that the traffic map is layer 3, and the network explorer is layer 2. Is there a way to graphically view the layer 2 information in network explorer?
Yes, you do this by clicking on a router icon in the top view. Note that, due to security reasons, you need to be logged into NAV for this to work.
The traffic map actually has quite a bit more features than just the top view, but unfortunately I don't think we have documented this very well. You can also right-click on icons to view more options, and when in "vlan view" mode (two levels down) you can also right-click on the white area to switch the current vlan. Holding the mouse pointer over an icon / link will show more info.