7-9.
The stadia method provides
horizontal distances of a higher
precision than those obtained by
taping, EDM, or differential
leveling.
1.
True
2.
False
Learning Objective: Identify
characteristics of instruments used
for determining horizontal
distances and elevations. Identify
procedures for determining the
vertical angle of a point by the
transit-stadia method. Use basic
terms and formulas and also perform
computations that are used on
topographic surveys.
7-10.
Philadelphia rods should be used
for stadia work for distances up to
1,500 feet.
1.
True
2.
False
7-11.
The stadia interval is defined as
POINT ROD INTERCEPT VERTICAL ANGLE
1.
the reading on the rod between
the stadia hairs
2.
the distance to the stadia rod
3.
the reading between the upper
stadia hair and the middle
cross hair
4.
the reading between the lower
stadia hair and the middle
cross hair
7-12.
When your stadia reading is more
than the length of the rod, what
procedure do you use?
1.
Read a half-interval using the
middle cross hair and then
multiply the reading by 2
2.
Hold two rods together
3.
Make a rod in the BU shop that
will be long enough
4.
Shorten your sighting
7-13.
Stadia distance is equal to
1.
the rod reading
2.
the rod reading divided by the
stadia constant
3.
the stadia interval
4.
the stadia interval times the
stadia constant
7-14.
Stadia horizontal distances are
normally recorded to what degree of
accuracy?
1.
To 0.01 ft with a target
2.
To 0.1 ft over 300 ft
3.
To the nearest foot
4.
As close as possible
IN ANSWERING QUESTIONS 7-15 THROUGH 7-19,
ASSUME THAT YOU ARE LOCATING POINTS B AND
C BY THE TRANSIT-STADIA METHOD WITH THE
INSTRUMENT SET UP AT STATION A. USE THE
FOLLOWING INFORMATION:
Focal
distance
=
1.00 ft
Elevation A
= 431.8 ft
Instrument height =
4.5 ft
Rod reading
=
4.5 ft
B
4.54
+3°18’
C
6.42
-2°44’
7-15.
What is the horizontal distance AB?
1.
451.6 ft
2.
452.6 ft
3.
452.8 ft
4.
453.5 ft
7-16.
The difference in elevation between
station A and point B is
1.
26.1 ft
2.
26.2 ft
3.
26.4 ft
4.
26.6 ft
7-17.
What is the elevation of point B?
1.
405.6 ft
2.
405.7 ft
3.
457.9 ft
4.
458.0 ft
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