Purpose: To get a better understanding of the necessary distance between flight passes for your project.

Last Updated: May 2021

Firstly, it is important to note that the point density of a project is dependent on the following listed factors.

- LiDAR scanner field of view
- Flight AGL (Above Ground Level)
- Flight Speed
- LiDAR Scan Rate

First, to understand the area you are covering you must find the swath length. Below is an illustration of what a swath would look like in the case of a payload with Livox Avia.

**Drawing Not to Scale*

Where:

*Swath Length* = *AGL* (m) *(2*tan(*FOV*/2))

So in this example let *AGL* = 100 meters. Our swath length would be as follows:

*Swath Length* = 100*(2*tan(35°))*Swath Length* ≈ 140 meters

Once our swath length is determined, we can find the point density of the scan using the following formula:

*Point Density* = *LiDAR Scan Rate* (pts/s)/(*Swath Length* (m) * *Flight Speed* (m/s))

So for our example let's say we flew at 5 m/s, then our point density would be as follows:

*Point Density* = 240,000/(140*5) ≈ 343 pts/m^{2Point Density ≈ 343 pts/m2}