Hi @JoeyC! Sorry for the delay in response. The IR height sensor or IR distance sensor on the bottom of the drone is effective up to about 2000 mm. So you could use that to measure the distance the drone is from the object right below it. You can use the height sensor with the get_height() function, which is documented here. It's a small drone meant for classroom use, so I wouldn't necessary recommend it for a larger scale topographical map. But if you wanted to make a small model terrain and measure heights of mountains and buildings, that would be doable That sounds like a great practice activity for a classroom. Hopefully that helps!