One of the most commonly asked questions about thermal imaging drones is what you are able to detect. FLIR put together a four minute video that compares a FLIR Duo (160 x 120 resolution) and a Zenmuse XT (640 x 512 resolution) at different altitudes. When you are considering using a drone for different applications; this can serve as a guide to the likelihood of success depending on the size of your target, and provide what is the maximum altitude you would be able to fly. I really hope this adds clarity to your efforts. Click the picture to watch the short video.