measurement

Hi all, I am still relatively new to the scene so bare with me. I am wanting to use the Phantom 4 Pro to take weekly measurements form point A to point B down a slope to determine if any movement is occurring. Its roughly 12m. Currently I am taking a single image directly above and using GSD...

I am creating an experimental product for (hopefully) the most popular drones on the market today. Unfortunately, I can't afford to buy every drone out there and measure them :(. If you have a drone (Any Kind!), all I'm asking for is the measurements on the bottom of the drone, specifically the...