A camera was equipped with a 152mm (6”) focal-length lens is used to take a vertical photograph from a flying height of 2780m above mean sea level. If the terrain is flat and located at an elevation of 500m. a.) What is the scale of the photograph? b.) What would be the scale at mean sea level?

A camera was equipped with a 152mm (6”) focal-length lens is used to take a vertical photograph from a flying height of 2780m above mean sea level. If the terrain is flat and located at an elevation of 500m. a.) What is the scale of the photograph? b.) What would be the scale at mean sea level?

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.

Question

A camera was equipped with a 152mm (6”) focal-length lens is used to take a vertical
photograph from a flying height of 2780m above mean sea level. If the terrain is flat and located
at an elevation of 500m.

a.) What is the scale of the photograph?
b.) What would be the scale at mean sea level?

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A vertical photograph is taken at an altitude of 1200 m above mean sea level of a terrain flying at an elevation of 80 m. The focal length of camera is 15 cm. The scale of the photograph will be nearly
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1. A camera was equipped with a 152mm (6”) focal-length lens is used to take a vertical photograph from a flying height of 2780m above mean sea level. If the terrain is flat and located at an elevation of 500m: a.) What is the scale of the photograph? b.) What would be the scale at mean sea level?
Question- A vertical photograph was taken at an altitude of 2000 m above mean sea level. If the scale of photograph for a terrain lying at an elevation of 250 m is 1: 1000. Find the focal length of the camera.
A flagpole appears in two successive photographs taken at an altitude of 2,000 m above datum. The focal length of the camera is 120 mm and the Length of the air base is 200 m. The parallax for the top of the pole is 52,52 mm and for the bottom is 48,27 mm. Find the difference in elevation between the top and the bottom of the pole.
Photogrammetry Question 3: A tower appears in two successive photographs taken at an altitude of 4000 m above the datum. The focal length of the camera is 160 mm. The parallax for the top and bottom of the pole is 72 mm and 63 mm respectively. If the height of the tower is 25 m then calculate the length of the air base(m).
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.
A camera with a focal length of 20 cm fitted in an aircraft is used for taking vertical aerial photographs of a terrain. The average elevation of the terrain is 1200 m above mean sea level (MSL). What is the height above MSL at which an aircraft must fly in order to get the aerial photographs at a scale of 1 : 8000? (a) 2600 m (b) 3000 m (c) 3200 m (d) 2800 m
Q4/ Assume that a vertical photograph was taken at a flying height of 5000 m above sea level using a camera with a 152-mm-focal-length lens. (a) the photo scale at points A and B was 1:30000 and B was 1:25000. (a) Determine elevations of A and B ? (b) What ground distance corresponds to a 20.1-mm photo distance measured at each of these elevations.
The objective of Photogrammetry is to: