This is lecture 1.
Accurate digital terrain levels using LiDARS in the NL. They want to upgrade the elevation of the country since they are 1/3 below sea level.
8th week — oral reports on assignment. (Monday 30-3). Team up with Lars. Download the book chapters locally.
Infra red light gets absorbed by water, it doesn’t get reflected! If it’s turbulent water, then you do get some reflections.
https://www.ahn.nl/ahn-viewer : you can view the NL in point cloud measurements! Holy shitt
You measure the incoming relflection on the rising edge when it exceeds a set threshold!
How do you deal with echoes? How do you know which pulse is attributed to that echo? I solve it by slightly varying the intervals between emitted pulses. So, irregular intervals between emitted pulses ⇒ correct assocation.
Geiger-mode LiDAR receive an array of points that come from a certain direction (? search this). Photo diode with 4096 detectors ⇒ 200 milion points in one sec.
Single Photon LiDAR — split beam into 10x10 beamlets and then process(?)
See accuracy for them. When you want to use each. For e.g. NL requires <5cm accuracy.
You can set speed limits for boats by measuring the waves levels.
You want to tune the scan rate based on the pulse rate to get a good variety of the raspandire a punctelor.
Pulse Position Modulation — see what that is