One of my clients asked me to make a detailed survey in the area shown in the attached picture. They want to understand how the elevation varies at the site, in order to make a precise calculation of the excavation volumes needed for some environmental remediation activities.
Apart from LIDAR, which I am considering but that I would like to avoid, can some of you give me any suggestions on how to make a traditional survey under quite a thick tree canopy? Each time I have tried making GPS surveys under the trees, I always got poor results and carrying out a decent survey was nearly impossible.
Many thanks in advance,