"The Landsat 7 satellite suffered a hardware failure early in its life that introduced striped artifacts into all of its images. By analyzing a large number of images we were able to virtually eliminate these stripes, as well as clouds and other atmospheric effects. The process was very similar to how we produced the global time-lapse imagery of the earth that we released last month."
"Mining data from a large number of Landsat images of each area allowed us to reconstruct cloud-free imagery even in tropical regions that are always at least partly cloudy."
"We prioritized recent data when it was available, so this update also includes refreshed imagery in many regions of the world, especially in areas where high-resolution imagery is not available, including parts of Russia, Indonesia, and central Africa."
Photo before/after of location in Saudi Arabia