We can see on the image the outlines of houses, streets etc. This is all under the town of Tel al-Dabaa.
An Austrian archaeological used the radar images to show the ruins of the Hykos's capital. The archaeologist wanted to see what the extend of the city is.
The full article: http://www.boston.com/news/world/middleeast/articles/2010/06/20/archeologists_use_radar_to_find_ancient_egypt_town/