4.8.34 - Principal line
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Practice Questions
Test your understanding with targeted questions
What does the principal line connect?
💡 Hint: Think about what points are relevant in a photograph.
Define the term 'Nadir Point'.
💡 Hint: Where does the camera look down towards?
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does the principal line refer to in photogrammetry?
💡 Hint: Look for the two main points related to camera positioning.
True or False: The nadir point is always the highest point in the photograph.
💡 Hint: Consider the position of the camera and what point it observes.
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Challenge Problems
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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.
💡 Hint: Consider Cartesian coordinates!
Assume an aerial photograph has a principal line incorrectly determined due to tilt. Discuss the potential spatial analysis errors that could arise.
💡 Hint: What other areas might this distortion affect?
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