8848.86 meters! The new height of Mount Everest has been announced. Why has the height of Mount Everest changed?

Event Review: On February 8, 65438, China and Nepal announced their summit of Mount Everest. 8848.86 meters! Behind this is the efforts of more than 70 members of the national survey team and 46 technicians of the geodetic data center. Since eight survey climbers successfully climbed the summit at 1 1: 00 in the early morning of May 27th, the new height of Mount Everest has attracted much attention. Is the Geodetic Data Processing Center of Shanxi Xi Natural Resources Department Mount Everest in 2020? New height? The unit of calculation of. It is understood that from April last year, the center began to make technical preparations, and by June this year, the project was completed in 65438+ 10, in which the peak data has been analyzed and sorted out by more than 300 schemes. According to media reports, this data is the snow surface elevation. There is a layer of ice and snow several meters thick on the summit of Mount Everest. The well-known height of 8844.43m is the height of rock surface measured in 2005, when the height of snow surface was 8847.9m.. This year's snow elevation is 8848.86 meters, so the height of Mount Everest is not as exaggerated as 4 meters, and its snow elevation has increased by 0.96 meters. As for the change of rock surface elevation, it will be announced later. ?

? This is the third time that China has measured the height of Mount Everest after 1975 and 2005. This time, satellite measurement has become the main force of measurement? The team members installed a GNSS (Global Navigation Satellite System) antenna at the top of the beacon, and the satellite broadcast its coordinates to the ground. After receiving the satellite signal, the ground receiver calculates the coordinates of the receiver's position and measures the true height of Mount Everest according to the satellite coordinates. For the first time in China, 5G is combined with Beidou, and the communication private network and Beidou data information management platform are used to realize the simultaneous reception, real-time analysis and quality pre-evaluation of Beidou-2 and Beidou-3 satellite signals in cold and high altitude environment. This also indicates that the Beidou system has developed very maturely and reliably. ?

? According to Dang Yamin, the leader of the technical coordination group for measuring the height of Mount Everest in 2020, the height of Mount Everest actually changes year by year, and the area of Mount Everest and even the whole Qinghai-Tibet Plateau are the result of collision and extrusion between the Indian plate and the Eurasian plate. Relevant data show that during the decade from 2005 to 20 15, the Everest region moved to the northeast at a speed of about 3 cm per year; It rises at a rate of about 0.4 cm per year. In other words, Mount Everest has shifted by 30 cm and increased by about 4 cm in ten years. In addition, this measurement includes the ice and snow layer, and the height change of Mount Everest is also related to the climate.