I’m working on a hexacopter equipped with magnetometers resp. metal detectors to find metals under the ground surface. Due to the short range of those sensors the drone should fly in a low and steady altitude measured from the actual ground not grass or any other vegetation. I haven’t made any experiences with appropriate sensors such as lidar yet. So I’m not sure how or even if it’s feasible. But maybe some of you did and you could share thoughts or ideas for my problem?