Airborne Laser Scanning (ALS)

Airborne Laser Scanning (ALS):

The TOPODRONE LiDAR is designed to perform airborne laser scanning (ALS). To perform this procedure, you will need a drone that supports the correct installation of the TOPODRONE LiDAR and is capable of following a planned flight path. One such drone, for example, is the DJI M300/350 RTK.

In order to get correct VLS data from the

TOPODRONE LiDAR,LiDAR theALS drone route should be built according to certain rules

rules:

1. Neighboring spans (hereinafter for simplification - scans) should have a lateral overlap of 30% or more. 2. 
2. Scans should be parallel to each other
3. The drone must follow neighboring scans in forward and reverse directions
4. The movement speed of the drone with the TOPODRONE LiDAR on the main section of the VLS should be constant
5. The distance from the TOPODRONE LiDAR to the ground surface shall be constant
6. To obtain correct ALS data, it is recommended to take at least two scans
7. Use original propellers to reduce vibration
8. Do not fly in squall winds or during precipitation to reduce noise
9. After initializing the TOPODRONE LiDAR and taking off, perform a calibration maneuver before the main ALS section of each flight
10. If the flight takes more than 30 minutes, it is recommended to perform the calibration maneuver again when the session time reaches 30 minutes after turning on the TOPODRONE LiDAR.

In case of insignificant height differences at the ALS location (up to 10 meters), it is allowed to fly the drone with TOPODRONE LiDAR at a fixed altitude (AMSL) The altitude of the drone flight is set relative to the altitude of the takeoff point Accordingly, for the main part of the flight, almost any software can be used that allows you to set the flight in a circle (to perform the flight in a circle).