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homework_assignment_4_figures_3___1_.pdf
6_traverse_surveying_1.pptx
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California State University, Fullerton
EGCE 214 Surveying
Homework Assignment 4 – Figures
Figure 1
Use this table to help you organize your work.
Traverse Surveying
Types of Traverses
• Open Traverse using deflection angles.
• Closed traverse using interior angles.
Open Traverse
Field Notes for an Open traverse
Closed Traverse
Angle Adjustments- Closed Traverse
Computation of Latitudes
and Departures
• Latitude (ΔY) = distance(H) cos α
• Departure (ΔX) = distance(H) sin α
• α is the azimuth!
Location of a Point
Closure of Latitudes and Departures
Latitude / Departure Computations
EXAMPLES
Line
Azimuth
Distance
AB
126055’17”
647.25
BC
178018’58”
203.03
CD
15031’54”
720.35
DE
284035’20”
610.24
EA
20609’42”
285.13
departures and latitudes?
relative precision of traverse?
linear misclosure?
Closure Error and Closure Correction
Quantity of correction
Bearing of misclosure line
1
= tan (
=
C latitude C departure
2
C departure
Clatitude
2
)
Compass Rule – distributes the errors in
lat/dep.
Clatitude
Length of line ( L)
latitude Perimeter of traverse ( P)
L
C latitude .latitude
P
L
C departure .departure
P
length of line latitude departure
2
2
tan (bearing or azimuth)
departure
latitude
Rectangular Coordinates
• Defines the position of a point with respect
to two perpendicular axes.
• In surveying, the axes used are the y axis
(north/south), and the x axis (east/west)
Coordinate Grids
• For this chapter we employ grids with
assumed coordinates.
Traverse station coordinates – using
balanced latitudes and departures.
Geometry of Rectangular Coordinates
EXAMPLES
Station
Length
Latitude
Departure
A
B
483.52
326.87
356.3
C
392.28
-388.01
-57.7
D
886.04
-489.68
-738.43
E
452.66
405.89
200.39
F
279.33
216.16
-176.92
A
421.97
-70.79
415.99
Y and X coordinates of A are 4166.20 and 6154.22 m
corrected coordinates for all points?
a)
b)
c)
d)
Station
Distance (m)
Azimuth
A
B
51.766
7707’30”
C
26.947
155025’41”
D
37.07
23303’38”
E
35.292
29706’18”
A
19.192
358010’49”
the latitudes and departures?
linear error of closure and accuracy ratio?
Balanced latitude and departure using compass rule?
Computed coordinate of the traverse stations using coordinates of A as
1,000 N and 1,000 E?
…
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