Magnetic Declination: 1. In a compass survey made twenty years ago the observed magnetic bearing of a reference line XY was N 42'21' E when the magnetic declination was 6'25' East. Lately in 2018, a new survey was made and the declination in the same survey site changed to 10'35' West. Determine the follwing descriptions of line XY: a.) Its true bearing twenty years ago; b.) The true azimuth from North and South; c.) Its new magnetic bearing; and d.) The magnetic azimuth from North and South in 2018.

Magnetic Declination: 1. In a compass survey made twenty years ago the observed magnetic bearing of a reference line XY was N 42'21' E when the magnetic declination was 6'25' East. Lately in 2018, a new survey was made and the declination in the same survey site changed to 10'35' West. Determine the follwing descriptions of line XY: a.) Its true bearing twenty years ago; b.) The true azimuth from North and South; c.) Its new magnetic bearing; and d.) The magnetic azimuth from North and South in 2018.

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

Control Survey and Geodetic reductions

Control surveys or survey controls are used to establish reference points as a basis for various construction activities. Vertical and horizontal control points are to be established in a control survey to increase accuracy. After establishing the control points, all other types of surveys such as topographic, right-of-way, aerial mapping, construction layout, boundary surveys, and utility mapping can be worked upon so that control networks can be formed. The place from which the observations are made is called a survey station.

Question

Magnetic Declination:
1. In a compass survey made twenty years ago
the observed magnetic bearing of a reference
line XY was N 42'21' E when the magnetic
declination was 6*25' East. Lately in 2018, a
new survey was made and the declination in
the same survey site changed to 10'35' West.
Determine the following descriptions of line
XY:
a.) Its true bearing twenty years ago;
b.) The true azimuth from North and South;
c.) Its new magnetic bearing; and
d.) The magnetic azimuth from North and
South in 2018.

2. From the closed compass traverse shown, if
the forward bearing of line AB is N 78'9' E,
compute the: LEC, the bearing of the LEC
and the RP.
DEPARTURE
DIST.
BEARING LATITUDE
COURSE
A-B
B-C
CD
D-E
E-A
B
111.30
11520m
12540-
0410
E
3149
117.50 m.
pe20-
D
119 20

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