The results show that with a SfM photogrammetry methodology, which is extremely simple and accessible to everyone, it is possible to obtain better results in geometric and visual aspects than those obtained with TLS, and they are valid for a detailed analysis of this type of rock art in a massively social approach of documentation that is not possible through other approaches. The meshes are compared by analysing visual, geometrical and operational criteria and how they influence the radiance scaling shading. The camera sensors on our mobile phones or pocket cameras today. Powerful sensors are becoming ubiquitous and they make it easier than ever to capture and digitise the world around us. The comparison is made on the 3D documentation of the Castriño de Conxo petroglyph in Santiago de Compostela, Spain, and extrapolated to two practical experiments on other petroglyphs. Memento is a cross platform software product (for both Mac and Windows) that allows users to work with data from photogrammetry and 3D scanners. In this study, an extremely simple and effective method based on SfM photogrammetry with low cost cloud computing software is compared to the use of a terrestrial laser scanner (TLS) and professional SfM workflow to generate 3D models for documenting petroglyphs. Structure from motion (SfM) photogrammetry was positioned as an ideal technique for its documentation, but this technique has great variability in its methodology and cost.

The geometric inventory and documentation of rock art present great challenges due to the high number of petroglyphs present in a territory, the distance between them, the state of abandonment of forest areas in many cases, limitations to access, and the geometric characteristics of such art.

Autodesk memento set scale and unit