Greetings, I flew a DJI Matrice 300 RTK this weekend for purpose of thermal imagining of a commercial college roof. I had to guestimate the flight Altitude for a 10X10 Pixel MFOV. I used ~ a 9MM lens and flew at about 90 feet AGL. Can anyone validate? Is there a chart out there somewhere that can be used? I called DJI and they were unable to provide the information needed. Thanks in advance. Larry