Q- A 2500 m long line lying at an elevation of 400 m measures 12cm on a vertical photograph. The focal length of the camera is 20cm. The scale of the photograph for an area having an elevation of 1000 m will be?

Q- A 2500 m long line lying at an elevation of 400 m measures 12cm on a vertical photograph. The focal length of the camera is 20cm. The scale of the photograph for an area having an elevation of 1000 m will be?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter14: Highway Surveys And Location

Section: Chapter Questions

Problem 12P

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Concept explainers

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.

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Q- A 2500 m long line lying at an elevation of 400 m measures
12cm on a vertical photograph. The focal length of the camera
is 20cm. The scale of the photograph for an area having an
elevation of 1000 m will be?

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