Modern unmanned aircraft systems (UAS), better known to the rest of us as drones or quadcopters, can be programmed to collect photos from specific coordinates, altitude, orientation, and gimbal angle, thus allowing photos on different days from the same perspective. The two photos above were taken less than 24-hours apart during normal and flood conditions on the Neshaminy Creek in Bucks County, Pennsylvania. In addition to reproducible perspective, drones can reach areas inaccessible during bad conditions. On day one, I was able to park in the lot shown in the top photo. On day two, I had to park several hundred feet away, but was still able to navigate the drone to the same location.
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