Images a, b, and c of ground points A, B, and C appear on a vertical photograph taken from a flying height of 2625 m above datum. A 153.16-mm-focal-length camera was used. Points A, B, and C have elevations of 407 m, 311 m, and 379 m above datum, respectively. Measured photo coordinates of the images are xa = –60.2 mm, ya = 47.3 mm, xb = 52.4 mm, yb = 80.8 mm, xc = 94.1 mm, and yc = – 79.7 mm. Calculate the horizontal lengths of lines AB, BC, and AC and the area within triangle ABC in hectares

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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.