Shi’an is located in China (Chongqing, Chongqing) and time zone Asia/Shanghai.
Places nearby are Baijia, Fulu and Zizhao.
Chengdu is 313 km away, Guangzhou is 924 km away and Shenzhen is 1,010 km away as the crow flies.
Distances from Shi’an to the most important cities in China and the world.
30.5902800°
107.9765700°
Approach used in computer vision systems
https://en.wikipedia.org/wiki/Corner_detection