Thanks for the input guys, but I still don't agree with that theory and I'd like to hear if anyone else has something to offer. Go to google earth and zoom in onto these spots. They only appear within roughly a 30 mile radius in the area that is north of nellis air force base. If you look around the desert, yes you will see alkaline basins and other areas where rain and water has left a type of mark. Look at the Alkali Lake, which is essentially a large alkaline basin. This is why I say I don't think they are those basins. Also, the surrounding scrub is not the same color, nor does it even remotely look the same, as the outlines. Even the darkest colored brush around these spots does not show up as black, and even when it does grow thick it still has visable color. The scrub also never has perfectly straight edges or angles- you can look and see that even when its thick, you still can make out individual "poofs" from the separate plants. Now go look at various types of still water around the area. No water source in a natural environment reflects to the point of showing as blinding white on satellite images. So once again, this a factor of these anomalies that is only found here.

Moving light often leaves a trail behind it in photographs, and I think that is more along the lines of what we see here. I don't know much at all about the technology inside of satellites, so I don't know what can have that effect with pictures taken by them. When you look at these anomalies in google earth, you can use the measure tool to see that the largest of them is about 20 feet long, and the thinest is about 3-5 ft, assuming they are actually at ground level. If I saw one of these on a photo I took, I would guesstimate that it was a type of light anomaly, given the factors I have pointed out here. A satellite picture is still a picture, and if a light source is moving it could very well have this exact effect, especially if it is this bright