What is everyone using for reusable Aerial Targets for the drone surveys?
Not reuseable, but cheap enough to be expendable. I recently set out targets that were 2.5" x 4" red and white stickers. The kind I've seen used for years, but I can't find a picture on line anywhere. I bought mine at Portland Precision Instruments. They are made by "Duramark Survey Products". The targets were perfectly visible in the aerial photos. And would have been at half the size.
Once upon a time I had my business cards printed with the red/white checker pattern on the back. In those days I was stapling them to lath for backsite targets. When I get into drone flying myself I'll probably do that again.
I've seen plastic cards of similar size with the red/white target on them designed to be hung on plumb bob strings. They would probably work great for reuseable aerial targets.
Same as aerial targets for larger aircraft only smaller in scale (obviously).
Material, paint, photos.
I made several from masonite and tiles. Tracking time, cost and results we paint nearly all of them now. Alternating squares of white and flo blue with a nail in the center. Point number at top right, read from the south.