Practice Principal Line (4.8.34) - Photogrammetry Surveying - Surveying and Geomatics

Practice: Principal line

Lesson 4.8.34Photogrammetry Surveying

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8 questions

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3 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
2 questions · about 1 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What does the principal line connect?
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Think about what points are relevant in a photograph.
Question 2.
Define the term 'Nadir Point'.
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Where does the camera look down towards?
3Question 3.
What does the principal line refer to in photogrammetry?
- A reference to ground signals
- A line connecting the principal point and the nadir point
- A guideline for capturing images
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Look for the two main points related to camera positioning.
4Question 4.
True or False: The nadir point is always the highest point in the photograph.
- True
- False
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Consider the position of the camera and what point it observes.
Question 5.
Given the principal point coordinate and nadir point coordinate, explain how the principal line can be plotted and what implications it has on measurement accuracy.
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Consider Cartesian coordinates!
Question 6.
Assume an aerial photograph has a principal line incorrectly determined due to tilt. Discuss the potential spatial analysis errors that could arise.
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What other areas might this distortion affect?

4 more questions in this section. Enroll free to practise them all.