ASSIGNMENT 8
Textbook Assignment: “Plane Table Topography and Map Projection.” Pages 9-1 through 9-23.
Learning Objective: Describe the
methods and procedures used to
locate topographic details in the
field and to produce a topographic
map using a plane table and
alidade.
8-1.
Surveyors prefer the plane-table
method for which of the following
reasons?
1.
Provides a nearly complete map
2.
Works well in poor lighting
3.
Requires the least amount of
equipment
4.
Provides quick setup and easy
movement
8-2.
The plane table method is
advantageous under which of the
following conditions?
1.
Surveying hilly terrain
2.
Drawing a large-scale map
3.
Plotting a large number of
irregular lines in open country
4.
Working in a very humid climate
8-3.
The note keeper on a plane-table
survey party is responsible for
what tasks?
1.
All computations
2.
Preparing the sketches
3.
Assisting the rodman
4.
Operating the alidade
8-4.
What type of alidade is preferred
for topography?
1.
Open sight
2.
Telescopic
3.
Self-leveling
4.
Direct reading
8-5.
The term table orientation is
defined by which of the following
statements ?
1.
Table alignment and orientation
2.
Sight and point alignment using
the alidade blade
3.
Scope orientation with paper
rotation
4.
Table rotation and eye
alignment
8-6.
What method of marking your point
on your sketch is recommended?
1.
Use the decimal point in your
horizontal distance
2.
Use the O symbol
3.
Use an “X”
4.
Use the decimal point of the
elevation
8-7.
Orientation by backsighting is
accomplished by what method?
1.
By sighting on an established
bench mark
2.
By plotting a traverse line
once you set up
3.
By using a plotted established
line
4.
By balancing all your shots
8-8.
Orientating the plane table by
compass is recommended for what
type of mapping?
1.
Accurate small scale
2.
Accurate large scale
3.
Rough large scale
4.
Rough small scale
8-9.
Which of the following items may
affect the orientation of the plane
table by compass?
1.
Local attraction
2.
The earth’s magnetic field
3.
Both 2 and 3 above
4.
Electrical parallax
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