The decade of excavations on the Hexenberg site led to a first archaeological synthesis. An important research problem concerns the relationship between the site, the floodplain (here, the North Ried) and the former course of the Rhine (now the Hexenberg is situated in the agricultural plain, at five kilometers from channelized river). To answer this issue, a study window was opened between Seltz and Drusenheim from the review of a LIDAR document, old maps, aerial photos and results from two recent operations in preventive archaeology to understand its relationships with its environment. A palaeochannel a hundred meters wide is still marked in the landscape and spends about five hundred meters down the Hexenberg hill. It seems to connect to the Rhine system and recent observations show a contemporary hydrological activity of the Hexenberg occupation. In addition, studies on metal objects rejected in ancient branches of the Rhine confirm this dating. The river has moved from west to east since the Protohistory. However, these data are fragile and this study marks the beginning of an extensive recognition and dating of Rhine paleobranches. The archaeological site, fortified by a palisade, is occupied during a relatively brief period, the late Bronze Age, with no prior occupation. The site was deserted, and although “ cleaned” during the Hallstatt C, and was briefly reoccupied by a small Gallo-Roman necropolis and a moat of the Early Middle Ages. The 4,000 m2 excavated revealed 197 structures and 100 stratigraphic units, making it a densely occupied site in comparison with the other known sites of the Rhine plain where the loess substrate, subjected to the agricultural erosion, are troncated to several tens of centimeters. The main strucutures are mainly shallow structures, similar to storage spaces. There are some silos (twenty cases) and, in e qual proportion, a serie of pits associated with undetermined bilobed skills. There is no pole building. The archaeological material consists of 900 kg of sherds within which 881 vases were isolated. In this group, we can find a wide variability of types especially for the open forms. The printed decorations on the high forms are varied. The decoration of red and polychrome paint is also present, but this corpus is very fragmented. Besides the pottery, we should report the presence of several fragments of clay crescents and ridge tiles, spindle whorls, cheese presses and loomweights. Metal artifacts, according to the habitat, differs by the presence of two main tools (burin and chisels). The study of lithic industry and petrographic determination attest the presence of a wide variety of raw materials, not yet certified in the Alsatian sites of this period (brecciated sandstone, basalt). The faunal spectrum indicates a preference for beef, wild animals and pork. These studies allow a better characterization of the Hexenberg site and its location, in relation with the course of the Rhine. This occupation appears as an original site in the Alsace plain during the final phase of the Bronze Age.

Abstract. The Natzweiler-Struthof camp is the only concentration camp in France, in Alsace. In 1941, when the construction of this camp began, the Nazi regime had already set up several concentration camps in annexed territory. The purpose of this camp was mainly to intern the resistance considered dangerous for the regime. From a chronological point of view, the camp integrated in May 1941 its first prisoners. They were condemned to carry out inhumane work until the evacuation of the camp on September 2, 1944. The Natzweiler-Struthof camp was associated with a granite quarry where we can still find concrete foundations of old buildings as well as three galleries excavated with explosives. The digitization work aims to archive, analyze and understand the organization and operation to result in a 3D reconstruction of the site. In 2018, the Struthof site began a major restoration project. For the first time in this camp, an archaeological diagnosis was then made with the aim of understanding the still existing facilities and assuming the presence of other elements now destroyed. To deepen the knowledge on this camp, the Regional Administration of Cultural Affairs authorized in 2020 to carry out prospecting accompanied by a study of the built-up in an area still empty of research: the quarry. Currently, this part of the camp shows the remains of three buildings and three galleries. To know more about these elements and indirectly about the life of the camp and its prisoners, this study shows the approach adopted to prepare the 3D modeling of buildings and galleries.

<p><span>Ground magnetic surveys are commonly used for imaging near-surface structures in archaeological studies. Usually, surveys are conducted using vertical component gradiometers or scalar gradiometers to produce a vertical pseudo-gradient map. Scalar magnetometers can also be used, albeit less frequently, to produce maps of the total magnetic anomaly. In all these cases, the equipment is pushed or pulled by an operator or carried behind a vehicle. Here we present a third approach made available by the use of three-component fluxgate magnetometers: fast surveys over large areas using a compact lightweight drone flying automatically 1 to 2 m above the ground and high precision surveys acquired by an operator 0,2 to 1 m above the ground. A case study on the gallo-roman site of Oedenburg, </span><span>located</span><span> along the Rhine River in its upper valley, illustrates the results that can be obtained with the approach. A comparison with previously acquired pseudo-gradient surveys show</span><span>s</span><span> that the presented method allows a faster coverage, a greater resolution for the imaging of short wavelength structures (such as walls) and a better capacity of imaging large wavelength structures (such as pathways, palaeochannels or soil composition variations). As the site is crossed by a high voltage electric power line, a method to suppress the high-amplitude 50 Hz frequency magnetic field is presented.</span></p>