If the uses of photogrammetry are many and various, the use of it in archaeology is now well standardised in the large majority of these uses. It is mainly a replacement of the traditional plan, section and elevation measurements of archaeological remains by the production of ortho-images, known as orthomosaics. This guide aims to provide students and professionals of our discipline with a complete protocol (from field acquisition to data storage), which has been tried and tested, with reproducible results, and which is entirely based on free scientific tools.