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Everest ‘grows’ as China, Nepal agree new height

The countries agreed on mountain's height was 2.8ft higher

SAMAA | - Posted: Dec 8, 2020 | Last Updated: 3 months ago
SAMAA |
Posted: Dec 8, 2020 | Last Updated: 3 months ago
Everest ‘grows’ as China, Nepal agree new height

Photo: AFP

The highest point on Earth got a bit higher Tuesday as China and Nepal finally agreed on a precise elevation for Mount Everest after decades of debate.

The agreed height unveiled at a joint news conference in Kathmandu of 8,848.86 metres (29,031 feet) was 86 centimeters (2.8 feet) higher than the measurement previously recognized by Nepal, and more than four meters above China’s official figure.

The discrepancy was due to China measuring the rock base on the summit and not — as with the new reading — the covering of snow and ice on the peak.

Trigonometry

Employing trigonometry hundreds of miles away on the Indian plains, British colonial geographers first determined Everest’s height in 1856 at 8,840 meters (29,002 feet) above sea level.

After Edmund Hillary and Tenzing Norgay Sherpa famously first reached the summit of Everest on May 29, 1953, an Indian survey readjusted the altitude to 8,848 meters (29,028 feet).

That measurement was widely accepted, with the number alluring not just ambitious mountaineers but also inspiring names for adventure clothing lines, restaurants and even a vodka.

In 1999 the US National Geographic Society concluded the world’s highest point was higher at 8,850 meters (29,035 feet). But Nepal never officially recognised this new height, although it is widely quoted.

China meanwhile conducted several surveys, and in 2005 came up with its measurement of 8,844.43 metres (29,015 feet).

They provoked a row with Nepal which was only resolved in 2010 when Kathmandu and Beijing agreed that their measurements referred to different things — one to the height of Everest’s rock and the other to the height of its snowcap.

Tectonic plates

Nepal decided to conduct the survey — the first time it has done its own — after suggestions that tectonic plate movements including a major earthquake in 2015 may have affected the height.

About 300 Nepali experts and surveyors were involved in the exercise, some walking on foot with others using helicopters to reach data collection stations.

Last spring, Nepali surveyors reached the summit of Everest with over 40 kilograms (90 pounds) of equipment, including a Global Satellite Navigation System (GNSS) receiver.

They spent roughly two freezing hours collecting data as dozens of climbers stood on top of the mountain.

“Climbing Everest alone is a challenging task, but we also had to measure it,” Khim Lal Gautam, a Survey Department official who lost a toe to frostbite in the expedition, told AFP.

China involvement

Nepal was due to release the results earlier this year but then China became involved after a visit to Nepal in October 2019 by Chinese President Xi Jinping.

This year a Chinese survey expedition had a more quiet working space on the summit as they were the only climbers on a mountain shut because of the coronavirus pandemic.

Dang Yamin, an expert at the National Bureau of Surveying and Mapping, told Chinese state broadcaster CCTV that the final result was an average value between the measurements by Nepal and China, in accordance with scientific rules.

“The final height was concluded after both sides jointly shared and processed data virtually,”  said Damodar Dhakal, a spokesperson at Nepal’s Department of Survey.

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