Quite simple. mad scientists like me like that cool stuff.
Just have a look at dotscene.com an extended high scale developed flying mapping drone.
On a very low level you can use Tello in combination with OpenCV, python, etc .... to do very simple scans.
Just to have fun with kids in a computer club to teach them that sience, mainly Physic, Math and Computer Science is not a Rocket Sience. Look the strange discussion around Computer Sicience at German schools today.
I hope to start again a computer club at a school at my home town. So I start now looking for sponsors
to buy a couple of Tello's and Raspberry's.
wow i just noticed that my video ended up here. I created this POC to show image recognition technologies using Tensor Flow and Python. The objective of the project was to detect 3 different signs (handcrafted cardboard symbols) and react. 1 card was to show walls, side walls and obstacles in order to navigate a room. Now that i see more attention in tello development im planning to upgrade this project, from a complicated Python back-end to a more friendly JS, NodeJS environment, hopefully with a simple script to install all dependencies.