| 1. |
The characteristics of a satellite Imagery can be summed up as:
Relatively large coverage areas >102 Km
Up to 1 meter resolution
Available in visible light and beyond visible spectrum
Current data can be costly $1,000 and up
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True |
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False |
| 2. |
Laser scanning instruments emit a pulsed laser signal with enough intensity to be uniquely detected by the instrument on its return signal from most reflective surfaces. Time travel of the light beam provides distance from the instrument to the reflected surface, and the pulsed signal is rapid enough that thousands of points _________________. Each point is recorded as a discrete three-dimensional coordinate relative to the instrument axis, |
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Can be recorded in seconds |
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Can be recorded in minutes |
| 3. |
All surveying type laser scanners collect a digital picture of the scene in addition to the data points. |
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True |
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False |
| 4. |
The laser scans provide additional information that typically would not have be collected by field survey methods, and simply _________________ at all by aerial photogrammetry. |
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would not have been seen |
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would have been seen |
| 5. |
Similar to ground-based laser scanning, airborne LiDAR relies upon a high-speed, reflectorless, laser distance meter instrument to collect point cloud data from an airborne platform. |
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True |
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False |
| 6. |
The viewing angle of airborne LiDAR is more favorable than ground-based lasers canning, to the site conditions typically ound on FHWA projects. Trees and brush ______________ through from the vertical perspective, so more data points can be detected on the ground surface. |
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Are much easier to see |
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Are blurry |
| 7. |
Airborne LiDAR is an advanced application of airborne positioning technology. The ability to precisely position a moving platform, particularly an aircraft where stop-and-go is not a possibility, is a very recent innovation. |
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True |
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False |
| 8. |
The combination of airborne inertial aided positioning combined with LiDAR and simultaneous aerial photography becomes ____________ for mapping solutions. The systems, as described, provide complimentary functions, and by themselves have proven gains in efficiency and economics. |
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Very problematic |
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Very attractive |
| 9. |
Merrick and Associates in Denver, Colorado is one of the first innovators to assemble such an aircraft. The single engine aircraft is equipped with a high-resolution digital mapping camera, inertial-aided GPS, and LiDAR system. |
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True |
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False |
| 10. |
Through projects such as those described above, the Federal Lands Divisions of the Federal Highways Administration have taken a deliberate active position to understanding and implementing technological innovations. Developing these innovations into operational methods will demand further investigations and motivated personnel supported with continuing education and training. |
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True |
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False |
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