<p>To Catalog the Dunes – Believe it or not, the United States Geological Survey does enter these dunes into a global dune database. The reason? “ Dunes are particularly suited to comprehensive planetary studies because they are abundant over a wide range of elevations and terrain types. Thus a global scale study of Martian dunes serves a dual purpose in furthering understanding of both climatic and sedimentary processes.” 
</p><p>Sounds good to us!
</p><p>NASA/JPL/University of Arizona (251 km above the surface, less than 5 km top to bottom and north is to the right)
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Source: <a rel="nofollow" class="external text" href="https://www.uahirise.org/ESP_019287_1180">www.uahirise.org/ESP_019287_1180</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2018-09-24 15:37
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/44913232311/">ESP_019287_1180</a>