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"Estimating the height of mountains is more difficult and complicated than it sounds," says Dr Paul Tregoning, a geophysicist from the Australian National University. "To get an updated GPS height of the top of Mt Everest, it's conceptually very simple: you go up Puma Dark Blue

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"It also becomes a requirement to define exactly what is meant by the 'top' [of the mountain]," Paul says. In 1999, a US team defined Mt Everest's tallest point as the top of its snow cap, and they reported a height of 8850m a figure currently accepted by the US National Geographic Society.

The project will take two years, he says.

Since Tensing Norgay and Edmund Hillary first conquered Everest's summit in 1953, more than 3000 climbers have Puma Shoes Online For Womens

to the top, turn on a GPS and it will calculate a height accurate to about 1m. But in practice, someone's got to climb the mountain carrying the equipment."

Now, scientists from Nepal are planning to take the most accurate measurement to date.

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have the technology and the resources, we can measure ourselves," Giri says. "This will be the first time the Nepal government has taken the mountain's height."

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However, a survey by the Chinese Academy of Sciences and the State Bureau of Surveying and Mapping excluded the snow cap and measured only the height of the rock underneath. Paul says the slow uplift rate will affect current calculations of its height, but only if the height is required to be known with millimetre accuracy.

Mt Everest height to be clarified

followed suit. At least 219 have died trying to do so.

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MOUNT EVEREST, WHICH STRADDLES the border between Nepal and China, is generally thought to stand at 8848m a height determined by Indian surveyors in 1957. But more recent measurements by teams from the US and China vary several metres.

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Gopal Giri, a spokesman from the Nepalese land reform and management ministry, says that during border talks between Nepal and China, Chinese delegates revealed they often use their measurement of 8844m when referring to the height of Mt Everest.

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The height that is provided by a handheld GPS, on the other hand, says Paul, is the height above this Puma Casual Shoes mathematical surface and is not related to sea level. Such surfaces are used by geographers as a more accurate basis for calculating elevation.

"We have begun the measurement to clear this confusion. Now we Puma Release Dates 2017

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To obtain a precise measurement involves overcoming a number of technical challenges, he says. "The first problem is that the height must be a measurement with respect to something. It must be relative to sea level, for example, or to what is called a 'reference ellipsoid' a mathematical surface.

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