Changes in expansion intensity, the number and area of spot of urban built-up areas in the Xinjiang Uygur Autonomous Region over the past 27 years.

Roman numerals are the serial number of different cities. I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII, XIII, XIV and XV represent Urumqi, Karamay, Changji Hui Autonomous Prefecture, Turpan, Hami, Altay, Tacheng Prefecture, Bortala Mongolian autonomous prefecture, Ili Kazakh Autonomous Prefecture, Aksu, Bayingolin Mongol Autonomous Prefecture, Hotan, Kashgar, Kizilsu Kirghiz Autonomous Prefecture and Shihezi, respectively.