CE 316 Geomatics
Card Set Information
CE 316 Geomatics
Lecture 5 - LiDAR
LiDAR is an optical remote sensing techology that measures properties of scattered light to find a ranger and/or other information of a distant target (i.e. collect topographic data)
LADAR uses beams to scan and process the signal echoed from targets to a create a virtual picture of the area
The ________ processor looks for familiar patterns in the scenes to continuously compare these patters with 3D target files stored in the weapons memory
processor looks for familiar patterns in the scenes to continuously compare these patters with 3D target files stored in the weapons memory
What is the primary difference between LiDAR and LADAR?
LADAR uses much shorter wavelengths of the electromagnetic spectrum
LADAR uses what kind of wavelengths? (Give examples)
Uses shorter wave lengths, typically ultraviolet, visible and near infrared
IMU stands for what?
LiDAR for terrain mapping is possible due to advances in what?
Inertial Measurement Unit
Data and storage management
How does LiDAR work?
Transmits pulses of light that reflect off objects
Return pulse is converted to electrical pulse via high speed data recorder
Time interval from transmission to collection is calculated based on the formula for the speed of light
Time intervals are converted to distances based on postional information
Rain and fog affect LiDAR by_________.
Rain and fog affect LiDAR by
producing false return signals
Using LiDAR in an area covered by high density vegetation will result in ________ and _______?
Using LiDAR in an area covered by high density vegetation will result in
low density ground points
How does slope affect LiDAR?
Errors are increased with sloped land
Most common LiDAR systems can be used for mapping water. True or False
False. However blue/green laser penetrates up to 50m
Name the four types of LiDAR scanning techiques used by aircrafts
Constant Velocity Rotating Mirror Scanning
Oscillating Mirror Scanning
Fibre Optic Scanning
LiDAR coordinates in North America reference what system?
Typically how many control stations are needed within 30km of a project site?
What are some applications of LiDAR?
Gutelius succesfuly used LiDAR to what?
Successfully used LiDAR for highway engineering, coastal mapping and corridor mapping for power lines
LiDAR is the most ______ remote sensing technology.
LiDAR is the most
remote sensing technology.