The satelite view is a bit less organized:

http://maps.google.com/maps?q=11.28+25.14&um=1

For more perspective here's a photo of the village - which appears to be more of a camp:

http://explore.org/photos/1725/gereida-sudan-village

In the satellite image I think it's safe to assume each white block is a tent and each dark outline is a fence. There are many dark outlines with no tents showing where the old population has moved out.

The wikipedia article explains the sudden changes in population of the settlement. It would probably explain the grid layout too.

https://en.wikipedia.org/wiki/Gereida

It looks like the north-west part is the actual town and to the east and south is where it expanded as a camp. Of course, now there is more town than (what I assume was the original) town.

+1 for mentioning this. Here is Khartoum the capital of Sudan.

https://maps.google.com.br/maps?t=h&ll=11.274876300000004%2C...

You can see that almost all of it is a nice grid. Makes me wonder why. It's quite amazing despite their poverty, they were able to organize the buildings.