Hey there,
To help you with your project I can start by suggesting the following product: https://www.robotshop.com/en/reach-uav-mapping-kit.html?utm_source=rb-community&utm_medium=forum&utm_campaign=offline-lidar-3d-visualisation
This is mostly a UAV system that will map using a camera.
Else, I believe that this post would be pretty interesting for you since someone already covered the 3D mapping question here: Designing a lidar enabled UAV system for terrain mapping
I hope this helped you.