When was the earliest Everest mapping activity in China?

As early as 1960, China had already carried out surveying and mapping activities on Mount Everest, and the surveying and mapping activities at that time were very accurate. At that time, the whole world was paying attention to this activity. From that day on, it showed that our country's satellite technology and surveying and mapping technology were world-class. In 2020, we conducted another most accurate test, this time to tell the world that only our country has mastered the most advanced surveying and mapping technology, and the accuracy of our satellite is the highest.