The transition from a humid green Sahara to today’s hyperarid conditions in northern Africa ~5.5 thousand years ago shows the dramatic environmental change to which human societies were exposed and had to adapt to. In this work, we show that in the 620,000-year environmental record from the Chew Bahir basin in the southern Ethiopian Rift, with its decadal resolution, this one thousand year long transition is particularly well documented, along with 20–80 year long droughts, recurring every ~160 years, as possible early warnings. Together with events of extreme wetness at the end of the transition, these droughts form a pronounced climate “flickering”, which can be simulated in climate models and is also present in earlier climate transitions in the Chew Bahir environmental record, indicating that transitions with flickering are characteristic of this region.

Keywords: Archaeology, geoarchaeology, terrestrial laser scanning, documentation, 3D GIS Terrestrial laser scanning was conducted to document and analyse sites of geoarchaeological interest in Jordan, Egypt and Spain. In those cases, the terrestrial laser scanner LMS-Z420i from Riegl was used in combination with an accurate RTK-GPS for georeferencing of the point clouds. Additionally, local surveying networks were integrated by established transformations and used for indirect registration purposes. All data were integrated in a workflow that involves different software and according results. The derived data were used for the documentation of the sites by accurate plans and cross-sections. Furthermore, the 3D data were analysed for geoarchaeological research problems, such as volumetric determinations, the ceiling thickness of a cave and lighting simulations based on path tracing. The method was reliable in harsh environmental conditions, but the weight of the instrument, the measuring time and the minimum measurement distance were a drawback. However, generally an accurate documentation of the sites was possible. Overall, the integration in a 3D GIS is easily possible by the accurate georeference of the derived data. In addition, local survey results are also implemented by the established transformations. Enhanced analyses based on the derived 3D data shows promising results.

The Last Interglacial period is important for the spread of humans from Africa to Eurasia. Significant wetter climatic conditions allowed humans to live in the present-day arid landscape in Northeastern Africa. However, not only the environment but also other parameters, such as the topography and the availability of good raw material sources, impact past human behaviour. Our mapping with the integration of archaeological sites and environmental archives clarifies regional differences and similarities across Egypt. The Eastern Desert is characterized by a small structured landscape with an above-average occurrence of eligible raw material and it differs from the more homogeneous landscape of the Western Desert with its large palaeo-lakes. The given map allows a more distinct evaluation of regional variabilities for Out-of-Africa’s northern migration route as a complex intermediate scale between a global and local approach to human-environment relations.