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Electronic Distance Measurement (EDM) - History and Modern Surveying
In surveying distance measurements were always a challenge for surveyors specially when long distances were to be measured with high accuracy. In 1950 scientist tried to calculate the distance by using light beam to travel over unknown distance with measured time. Ordinary lights travels at a velocity of 186,000 miles per second, therefore the time taken will be very small to cover a short distance .
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