Laboratory work No.2.
COMPUTING AND PLOTTING HORIZONTAL SURVEY
Given:
Sketches of traverse and of horizontal survey, coordinates and whole circle bearing
N1 = 1000,30m - YN×10m
E1 = 1020,20m - YN ×10m
α1-2 = 136º 29,0′ - YN ×5º
YN (your number in the group list) =
Tasks:
1.
Calculate coordinates for points of traverse 2-6 (fill in Table 1).
2.
Point 7 coordinates determination.
3.
Plot the traverse, annotate coordinates of the points, distances, angles and azimuths (scale 1:1000).
Fig. 1 Sketch of traverse
Table 1. Points 2-6 coordinates determination
Traverse angles 
Observed 
Adjusted 
  
  
Point
Nr.
Whole circle bearing 
  
Bearing
  
Distances d,
m
Differences in coordinates, m
Computed
Adjusted
N
E 
N
E
1
|
2
|
3
|
4
|
5
|
6
|
1
|
2
Σ
Σ
 ' 
  t  180 (n – 2) 
f     '  t 
f  all
±2mβ n 
Σd
VEi  
fE
di
d
VN i  
fN
di
d
ΣN‘
ΣE‘
mβ =
n=
 i   i 1
 180
N   d cos 
E   d sin 
f N   N  
f E   E  
 βi
fs 
f N2  f E2 
1
 f sd 
F
1
d
fs
=
1
;
........
1
Fractional accuracy  1 ;
= 1
2000
N i 1  N i  N i
Ei 1  Ei  Ei
F
........
ΣN
ΣE
Coordinate, m
N
E
Computation of point 7 coordinates:
N 7'  N 3  N 37 ,
N 37  d 37  cos  37,
 37   3 4  44  47,0 ' .
E 7'  E 3  E 37 ,
E 37  d 37  sin  37,
Control:
N 7"  N 5  N 57 ,
N 57  d 57  cos  57,
 57   56  46  47,2 ' .
E 7"  E 5  E 57 ,
E 57  d 57  sin  57,
Final coordinates:
N7 
N 7'  N 7"
,
2
E7 
E 7'  E 7"
.
2