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Work Methodology. (traverse)
1)
When the area of traversing was described to us, firstly we walk
around the location and
develop a simple sketch, in order to assist us in making the
exact plan.
2)
Then we mark the traverse location by spraying a nail onto the
ground. We manage to give the
area into two four sided polygon.3)
A tripod was placed above the first point and a plumb line, (a
piece of lead with a tapering end
hung to the base of the tripod pointing exactly on the nail
hanging by a thin thread), plumb bob
was placed at the point of convergence of the legs of the
tripod, and made to drop freely onto
the top of the nail.
4)
To set up the theodolite properly we refer to the bubble
adjustment method.
5)
Same procedures are repeated to set up the theodolite at each
station.
6)
After set up was done, the recording are started, we were using
the face-to-the-left traversing
method. Therefore from our first point, we will measure the
angle from right to the left which
was the last and the second point.
7)
Then we hold the reading in theodolite and moved to the second
point.8)
The method is repeated until all the internal angle of our
polygon was measured.
9)
We supposed to measure the distance between points but its quite
impossible and thus we
decided to obtain the distance in tacheometry.
10)
All readings were recorded in a table provided.
11)
Then the error of traverse was determined by calculating the
total internal angle and compares
it to the theoretical value.
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Work methodology. (tacheometry)
1)
We did the tacheometry using the same location and the same
exact traverse station.
2)
A tripod was placed above the first point and a plumb line, (a
piece of lead with a
tapering end hung to the base of the tripod pointing exactly on
the nail hanging by a
thin thread), plumb bob was placed at the point of convergence
of the legs of the tripod,
and made to drop freely onto the top of the nail.
3)
To set up the theodolite properly we refer to the bubble
adjustment method.
4)
Same procedures are repeated to set up the theodolite at each
station.
5)
In tacheometry we faced several problems such as difficulties in
obtaining exact 90 for
the vertical angles. This is due to the environmental
condition.
6)
Then we obtain the reading of the stadia hair (upper and lower),
mid-reading,
horizontal and vertical angle from each station.
7)
Each data was tabulated in the table given.
8)
The error internal angle were determined.
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Work Methodology.(leveling)
1)
We started the leveling process from the given benchmark
point.
2)
The Auto-level was set up accordingly by fixing the bubble
method.
3)
Benchmark is the first back-sight and staff was placed there.
The well-balanced Auto-level was
shooting exactly to the staff and first benchmark reading was
obtained.4)
Then the staff was moved to the next point referred as the
front-sight, the reading was obtained
as the first front-sight.(the distance was fixed)
5)
Then the Auto-level was moved and shoot to the previous staff
position and reading obtained
was the backside reading. Then the staff was moved to next point
and referred as the front-
sight.
6)
This step was repeated until we arrived at the last point which
was fixed by the lecturers.
7)
Then we repeat again but in reverse direction until we met the
benchmark again.
8)
All the arithmetical check, errors and misclosures was
computed.
