Airborne Topographic LiDAR Quiz
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Question 1 of 10
1. Question
1. Airborne LiDAR technology is used to measure topography using what technology?
Hint
Airborne Light Detection and Ranging (LiDAR) System, sometimes referred to as Airborne Laser Scanning (ALS), is a remote sensing technique used to measure the distance to an object by determining the time of flight for an emitted laser beam.
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Question 2 of 10
2. Question
2. Traditionally, pulse widths for topographic systems have been in range of about 10 ns which means that there is a __________ of about 1 meter along the laser path behind each received LiDAR return.
Hint
Traditionally, pulse widths for topographic systems have been in range of about 10 ns. This means that there is a “blind spot” of about 1 meter along the laser path behind each received LiDAR return.
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Question 3 of 10
3. Question
3. The most common scanning techniques are?
Hint
Oscillating Mirrors and Rotating Mirrors
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Question 4 of 10
4. Question
4. Which scanning pattern produces an elliptical scanning pattern with redundant data.
Hint
Palmer scanner that produces an elliptical scanning pattern with redundant data that can be used for calibration or to get a forward and aft view of the same target
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Question 5 of 10
5. Question
5. Which of the common landscape materials have typically the highest relative reflectance?
Hint
Snow has the one of the highest relative reflectiveness.
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Question 6 of 10
6. Question
6. True or False? A LiDAR product with 1 point per square meter (ppsm) is sufficient for many applications such as flood mapping in many areas.
Hint
A LiDAR product with 1 point per square meter (ppsm) is sufficient for many applications such as flood mapping in many areas.
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Question 7 of 10
7. Question
7. GLONASS receivers capable of receiving satellite information from GPS and GLONASS constellation (Russian version of GPS) ___________ over GPS only receivers.
Hint
GLONASS receivers capable of receiving satellite information from GPS and GLONASS constellation are preferred over GPS-only receivers.
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Question 8 of 10
8. Question
8. What is it called when there are typically five points on five land cover categories being tested, one per category, with a minimum spacing of about 1000 feet between points?
Hint
Cluster surveys are typically five points when five land cover categories are being tested, one per category, with a minimum spacing of about 1000 feet between points.
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Question 9 of 10
9. Question
9. What is the process whereby the acquired LiDAR points are filtered, and those representing ground and above ground features (such as trees and buildings) are assigned to separate classes?
Hint
Classification is the process whereby the acquired LiDARpoints are filtered, and those representing ground and above ground features (such as trees and buildings) are assigned to separate classes.
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Question 10 of 10
10. Question
10. True or False. The manual classification is the most time-consuming and often the most expensive component of LiDAR processing.
Hint
The manual classification is the most time-consuming and often the most expensive component of LiDAR processing.