Why do you want someone to measure the height of Everest

Why do you have to test the height of Everest?
Today, the 2020 Mt. Everest Height Survey Team rush to the top! Maybe you want to ask, why not go up the mountain by helicopter, or use remote sensing satellite to measure? Party Yamin, leader of the 2020 Everest height measurement technology coordination group, said that the satellite remote sensing accuracy is not enough, but only the snow height can be measured; the peak space is small, the helicopter can not land, and the wind caused by the propeller may also cause snow and ice collapse