Development Test Network
This is a physical installation of the HPN router based mesh network on the CSIR campus with about 10 nodes. The wireless cards would be set at the lowest power and some form of attenuation would be used.
Each node would have the GPS co-ordinate configured at part of the setup. On the server side (WISP) all the co-odrinates of the installed HPN's can then be used to plot a map. This can then be overlaid on a Google map. (Something like what David has done - need to get the link)
Here is the link: