• • Exce Except pt that that the the lin line e of of sig sight ht may may be be • WellWell-su suit ited ed in rolli rolling ng or hill hilly y cou count ntry ry
• below and perform arithmetic check. = = .
Backsight
Foresight
s m
s m
α
(m)
DE Elev
α
(m)
(m)
BM1 1.245 -4°25’ 2.42 TP1 BM2
2.044 3°20’
1.08
(m) 75.0
1.515 8°18’
1.55
1.438 -3°25’
3.06
Backsight sta
s (m)
BM1
1.245
-4°25’
TP1
2.044
3°20’
Foresight RR (m)
α
2.42
VD (m)
s (m)
DE Elev RR (m)
α
VD (m)
(m) (m)
9.56
75.0
1.08 11.86 1.515 .
8°18’ - °
’
1.55 21.64 32.07 107.07 .
.
-
.
DE = RR BS ± VD BS ± VDFS − RRFS
. DE = 32.07
.
.
– .
. DE = -22.39
.
– .
– .
.
Backsight sta
s (m)
BM1
1.245
-4°25’
TP1
2.044
3°20’
α
Foresight RR (m)
VD (m)
2.42
-9.56
s (m)
DE Elev RR (m)
α
VD (m)
(m) (m) 75.0
1.08 11.86 1.515 .
8°18’ - °
’
1.55 21.64 32.07 107.07 .
- .
-
.
DE = RR BS − VD BS + VDFS − RRFS
. – - . DE = 32.07
.
– .
. DE = -22.39
.
- .
– .
.
• is the use of the stadia method in measuring the length of the traverse lines instead of the tape • The following quantities are obtained: – Horizontal length of each line of the traverse – Direction of each line which may be a bearing or an azimuth –
eva on o e s a ons o differences in elevation
e raverse an
e r
angles for a transit-stadia traverse. The . , interval factor is 100.0 and C = 0.0. Rod . Compute the length of each course, the , the traverse stations.
Station
Obj
Stadia Interval
Vertical Angle
B
A
2.59
0°46’
C
1.33
8°15’
B
1.32
-8°16’
D
3.80
-2°25’
C
3.78
2°20’
E
2.19
-1°33’
C D
SUBTENSE BAR A two metre . distance is determined b measuring the angle between t e two en s of the bar. The distance the smaller the angle.
near the middle of a traverse line MN. At , ’ ”, the angle is 63’16”. Find the length of MN.
