Magnetic raw data (SENSYS MXV3 system entire dataset) during campaign AFM-NIhK-2020-25, Ahlen-Falkenberger Moor (area 73), Germany

This is the measurement data from the geomagnetic prospection of the Ahlen-Falkenberger Moor (district of Cuxhaven, Lower Saxony, Germany) as part of the research project Preserved in the bog - relics of prehistoric settlement landscapes in the Elbe-Weser triangle funded by Niedersachsen Vorab. A total of about 800 ha were measured. The aim was to locate archaeological sites as well as landscape features. The measurements were carried out with a MXV3 system from Sensys with 6 FGM650/3 probes with a distance of 0.5m. Each probe consists of 2 sensors with 650mm basedistance and gives the gradient of the vertical component of the magnetic field (Z). The location was measured using a Stonex S10 GPS with Sapos HEPS correction data, resulting in a horizontal position accuracy of 0.01 – 0.02m and an elevation accuracy of 0.02 – 0.03m. The data were exported using DLMGPS (Sensys), whereby the coordinates of the individual probes are automatically determined from the central GPS position on the device. The data were exported without automatic track compensation. Due to the system, the position data is in UTM32/ETRS84 (EPSG 4647) and for conformity with PANGAEA also in WGS84 (EPSG 4326) (conversion is done with spTransform in R).本数据集为德国下萨克森州库克斯哈芬地区阿伦-法尔肯贝格沼泽（Ahlen-Falkenberger Moor）的地磁勘探测量数据，作为由下萨克森州前瞻基金（Niedersachsen Vorab）资助的“保存在泥炭中——易北河-威悉河三角地带史前聚落景观遗存”（Preserved in the bog - relics of prehistoric settlement landscapes in the Elbe-Weser triangle）研究项目的一部分。本次勘探共完成约800公顷区域的测量，研究目标为定位考古遗址与景观特征。测量工作采用Sensys公司的MXV3系统，搭配6台FGM650/3型探头，探头布设间距为0.5米。每台探头包含2个基线间距为650毫米的传感器，可输出磁场垂直分量（Z分量）的梯度数据。点位坐标通过搭载Sapos HEPS校正数据的Stonex S10型GPS接收机获取，最终实现的水平位置精度为0.01–0.02米，高程精度为0.02–0.03米。数据通过DLMGPS（Sensys）软件导出，设备内置的GPS中心位置可自动计算各探头的坐标，本次导出未启用自动轨迹补偿功能。由于系统原生限制，原始位置数据采用UTM32/ETRS84坐标系（EPSG 4647）；为适配PANGAEA数据库的格式要求，同时将数据转换为WGS84坐标系（EPSG 4326），坐标转换通过R语言中的spTransform工具完成。