Remote Sensing of Large-Scale Areas at the Urban Sites of the Mongolian Orkhon Valley Using Low-Cost Drones : preliminary Results and Some Thoughts on the Urban Layout of the Uyghur Capital Qara Balǧasun. - Franken, Christina; Rohland, Hendrik (Archaeologist); Ėrdėnėbat, Ulambai︠a︡ryn (Ulambai︠a︡ryn); Block-Berlitz, Marco; Batbayar, Tumurochir (Kommission für Archäologie Außereuropäischer Kulturen, 2020)