There are two points, A and B, whose elevations above datum are h₁ = 1710 ft and hß = 1425 ft and whose images a and b on a vertical photograph have photo coordinates = 2.95 in., y₁ = 2.32 in., x = -1.64 in., and y = -2.66 in. The camera focal length was 152.4 mm and the flying height above datum 7650 ft. On the same photograph, an image c of a third point C' appears. Its elevation hc = 1455 ft and its photo coordinates are x = 3.20 in. and Yc = -2.66 in. Compute the horizontal angles in triangle ABC.

There are two points, A and B, whose elevations above datum are h₁ = 1710 ft and hß = 1425 ft and whose images a and b on a vertical photograph have photo coordinates = 2.95 in., y₁ = 2.32 in., x = -1.64 in., and y = -2.66 in. The camera focal length was 152.4 mm and the flying height above datum 7650 ft. On the same photograph, an image c of a third point C' appears. Its elevation hc = 1455 ft and its photo coordinates are x = 3.20 in. and Yc = -2.66 in. Compute the horizontal angles in triangle ABC.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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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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There are two points, A and B, whose elevations above datum are
h₁ = 1710 ft and hß = 1425 ft and whose images a and b on a vertical
photograph have photo coordinates a = 2.95 in., Ya = 2.32 in.,
x = -1.64 in., and y = −2.66 in. The camera focal length was
152.4 mm and the flying height above datum 7650 ft.
On the same photograph, an image c of a third point C appears. Its elevation
hc = 1455 ft and its photo coordinates are c = 3.20 in. and
Yc = -2.66 in. Compute the horizontal angles in triangle ABC.
Compute angle A.
Express your answer in degrees to six significant figures.
A =
7| ΑΣΦ | 11 | vec
Compute angle B.
Express your answer in degrees to six significant figures.
B =
OF
[V| ΑΣΦ
vec
?
?
0

Compute angle C.
Express your answer in degrees to six significant figures.
C=
[Π| ΑΣΦ
Η
vec
-
?

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