Mount Everest is familiar to all of us. Although we have never climbed it, we know it is the highest mountain in the world. On the afternoon of the 6th, the 2020 Everest elevation survey mountaineering team held a departure ceremony. More than 30 members set off from the Everest Base Camp at an altitude of 5,200 meters and headed for a higher altitude. In 2020, the summit of Mount Everest officially began.

It is understood that in 2020, the height measurement of Mount Everest will comprehensively use GNSS satellite measurement, precision leveling, photoelectric ranging, snow depth radar measurement, gravity measurement, astronomical measurement, satellite remote sensing, quasi-geoid refinement and other technologies. Among them, GNSS receiver, snow depth radar, meteorological measurement, beacon and other instruments need to be carried to the top of the mountain.

What does the height of Mount Everest mean to mankind?

The results of this Everest elevation measurement can be used for the study of geodynamic plate movement and other fields. Accurate peak snow depth, meteorology and wind speed data will provide first-hand information for glacier monitoring and ecological environment protection. The results of GNSS survey, leveling survey and gravity survey, combined with previous related data, can not only accurately analyze the influence of current crustal movement changes, but also provide accurate gravity anomaly data for the subsequent establishment of quasi-geoid models. The results of gravity measurement can be used to establish the gravity field model of the earth region in the Everest region, and to study the problems such as glacier change, earthquake and crustal movement.

How high is Mount Everest now?

The height of Mount Everest, the snow height (total height) adopted by Nepalese and other countries is 8848 meters, which is consistent with the measured value of Mount Everest by China surveyors in 1975; In China, the rock surface height (bare height or geological height) measured by the State Bureau of Surveying and Mapping of China in 2005 was 8844.43 meters. In 2005, the accurate measurement and publication of the rock surface elevation of Mount Everest at an altitude of 8844.43 meters was strictly scientific and legal, and it has always been used as the standard data in China. No unit or individual may use the legally published elevation data of Mount Everest, that is, 8844.43 meters, before the new elevation data of Mount Everest is published by the authorized department of the State Council or the State Council.