Strange ripples on swirling hills seen in Landsat-8 images leave NASA perplexed

The images show ripples on land on either side of the Markha river, with alternating light and dark stripes that give it an optical illusion-like quality.

from http://www.firstpost.com/tech/science/strange-ripples-on-swirling-hills-seen-in-landsat-8-images-leave-nasa-perplexed-9359941.html