As early as in 2500 BC, Chinese began astronomical observation and geographicalsurvey.
早在公元前2500年，中国人就开始了仰观天文，俯察地理的活动。
2
Tsugaru area by using altitude data provided by the GeographicalSurvey Institute of the Ministry of Construction, Japan.
通过津轻地区的地理测绘研究所的建设，日本部提供的高度数据。
3
As early as 2,500 BC, Chinese began astronomical observation and geographicalsurvey, and gradually formed a world outlook of an integration of the universe and humanity.