There are already LIDAR units for drones about that size.[1] About the same weight, better resolution, available now. There are smaller phone time of flight cameras, with better resolution.<p>Really needs price info. There's good expensive stuff, and not very good cheap stuff, in this space.<p>[1] <a href="https://www.digikey.com/en/product-highlight/l/lightware-lidar/sf45-b-microlidar-distance-sensor" rel="nofollow">https://www.digikey.com/en/product-highlight/l/lightware-lid...</a>