The site of Altin Diliar is an inaccessible Persian fortress located in the desert in the north of Afghanistan, and has been surveyed only once, by a Russian team in the 1970s. As a result of the deterioration caused by erosion and pillaging, a report upon the general state of preservation of the site was required.
The use of an easily transportable drone gave us access to the site without having to use the very poor roads leading to it. Flying over the site at different altitudes enabled the production of a very high resolution orthophotograph (3 cm per pixel) and the calculation of a digital terrain model at 10 cm per pixel. These documents illustrate the phenomena of erosion affecting the site and enable an understanding of the state of preservation in order to plan for possible intervention by archaeologists in the field.