Complete this quick survey as part of your pre-flight checks to produce sample thermal and visual images of how big the missing person might appear on your screen.
This helps to “calibrate” your eyes and find out if your parameters are optimal for each function of remote sensing (detection, recognition, and identification).
There are 3 functions of remote sensing that are relevant to missing person searches, each requiring greater resolution to accomplish:
Importantly, each of these functions have a different effective resolution, i.e., the number of pixels the object needs to be on your screen to detect, recognise or identify it. A widely used criterion for minimum resolution requirements for imagery is Johnson’s Criteria, based on the work of John Johnson for the U.S. Army. Johnson’s Criteria is usually referenced in terms of achieving a 50% probability for each function; however, the International Aeronautical Maritime Search and Rescue Manual calculates that a 79% probability is more optimal during a search. Therefore, the longest edge of a search object must subtend:
Drone: DJI Mavic 2 Enterprise Advanced
Screen: Built-in screen on the DJI Smart Controller
Missing person characteristics: