A vertical photograph was taken from a height of 3200 m above mean sea level with a camera of focal length 120 mm. It contained two points 'a' and 'b' corresponding to ground points A and B. Calculate the horizontal length AB, as well as the average scale along the line 'ab' from the following data: Photo points a b Elevation above MSL in (m) 640 780 Photo coordinates x(mm) y(mm) + 19.50 - 14.60 + 26.70 + 10.80 -

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Q: Size of photograph

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Q: Find the angle CBD

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Photogrammetry

Photogrammetry is a technology of taking measurements of physical objects present in the environment, using photographs. It includes the process of recording and analyzing a three-dimension image in the two-dimension form. Photogrammetry was invented around 150 years ago in 1851 by Aimé Laussedat, he was also known as the father of photogrammetry, but this method was not in use until 50 years after its invention. This method was first used in Germany by Dr. Albrecht Meydenbauer in 1893 who was the director of the Royal Prussian Photogrammetric institute founded by him.