I used DroneDeploy to assist in the creation of an as-built drawing of a 15 acre landfill liner. The images were obtained at 158 feet above ground level and 256 images were stitched to create the 27K x 19K pixel orthomosaic.
On this image I was able to read the installer’s and our CQA tech’s notes written on the black HDPE liner.
I had to reduce the size of the image by 1/2 for my CAD software (TurboCAD) to display it as an underlay but after doing that, I traced the panel outlines and added the notations with CAD. I kept the original image open on a second monitor and referred to it for details.
The resulting drawing is not survey grade but it is sufficient for the documentation. Sure beats drawing it out by hand.