cameroon gce A level special technique surveying 1
cameroon gce A level special technique surveying 1
1. The objective lens of an aerial photographic camera is characterized by:
A Height of flight and diaphragm
B focal length, field of view and resolution power
C Object distance, temperature and scale
D Scale, type of photograph and type of surveys
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2. Identify a source of terrestrial control points amongst the following:
A Pre-marking
B Height of flight
C Pre- restitution
D Height above datum.
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3. Calculate the gradient in percentage between two points A and B whose heights are, 16.35m, 17.45mm respectively and distance between them is 45m?
A +0.024%
B +1.4%
C +2.4%
D -4.32%
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4. Calculate the scale used during a photogrammetric mission, given that a wide angle camera with focal length 152.4mm and format 230mm by 230mm was used to photograph a square ground of side 1000m.?
A 1/4348
B 1/4438
C 1/4384
D 1/4248
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5. Plotting a plan with contour lines on a universal stereo instrument is known as
A stereo restriction
B compilation
C restitution
D stereometry
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6. Absolute orientation has.
A 8 elements
B 9 elements
C 7 elements
D 3 elements
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7. A term which refers to the leveling and scaling of the model is
A absolute orientation
B inner orientation
C absolute and inner orientation
D absolute analog orientation
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8. Which of the following statements best describes the term datum?
A An imaginary horizontal plane reference for x and y coordinates
B An imaginary horizontal reference plane for x, y, and z coordinates
C A vertical plane reference only
D An imaginary horizontal plane reference only
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9. The principal aim of rectification of aerial photograph is to ?
A eliminate the photographic distortion of points on them due to relief and tilt
B ease visualization
C improve the photographic altitude
D overlap them and see details
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10. The content of a topographic map or plan placed definite requirement from their view point. They are:
A linear scale, representative fraction and word
B dimensioning and purpose of the plan
C Reliability, completeness, clarity and accuracy.
D Large scale, Medium scale, and small scale
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11. Calculate the height of flight when the scale of a photograph is 1/17500 and the focal length of the camera is 200mm?
A 3490m
B 3510m
C 3500
D 3400m.
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12. Calculate the distance between points a and b if a vertical photograph was taken with a camera of focal length 152mm given the following image coordinates: xa= -68.30mm, ya = 28.25mm, xb ₌ 15.72mm, yb = -50.45mm?
A 114.98 mm
B 115.95mm
C 116.13mm
D 115.12mm
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13. The height of a point (A) interpolated between contour lines was 106.81m and that of point (B) was 104.72m. The distance between these two points is 6.3cm. Identify the difference in elevation between points A and B.
A +2.09m
B +2.1m
C -2.1m
D -2.09m
