New measurements have revealed that a fifth mountain in Wales, and not four as previously thought, measures higher than 1000 metres.
Usually, the Ordnance Survey measures the height of a mountain using a method called photogrammetry when detailed aerial images are taken to create three dimensional images of the countryside. However, this method is not detailed enough and can be 3m higher or lower than the correct height.
As a result, a more detailed measurement was taken by climbing
to the summit of Glyder Fawr and securely strapping a Grade GPS antennae to the side of the summit rock. By receiving signals from satellites orbiting 22,000km above the earth, it was possible to calculate a more accurate measurement. The data was recorded for four hours before being processed and then confirmation was received from the Ordnance Survey that Glyder Fawr is actually 1000.8m high.
On behalf of the National Park Authority, its Director of Land Management, Emyr Williams said: “We are extremely pleased that G & J Surveys have gone to so much trouble to ensuring a correct measurement for Glyder Fawr. We now have a fifth peak in Snowdonia which is higher than 1000m and as a result, it is sure to attract more walkers to this area and it also adds another peak to the Welsh 1000m Peaks Race. Our challenge however, following today’s announcement, is to ensure that this area’s special qualities will be
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