In Western Venezuela, there is large scale rock art along rapids in the Orinoco river. University College of London archeologist Philip Riris used the same 3D imaging technology that we have pioneered to visualize the images.
Photogrammetry lets us look for petroglyphs that are otherwise impossible to see. At one of the Ancient Art Archive sites in the Southeastern US we've spent months mapping the fine level engravings on a cave ceiling. The work is difficult and painstaking but it can reveal artwork that is otherwise impossible to see (more here).
Hats off to Riris and his team for adapting 3D technology to see otherwise invisible work.
The Ancient Art Archive is a 501(c)3 registered not for profit. All donations are tax deductible. All images copyright Stephen Alvarez 2017
Ancient Art Archive, 165 Laurel Drive, Sewanee, TN 37375 USA