This dataset represents frequency domain Electromagnetic induction (EMI) data created by using electromagnetic waves generated in a transmitter and recorded in three receiver coils to create maps of electromagnetic subsoil properties at different sensing depths. A CMD Mini-Explorer by GF Instruments was used. The device consists of one transmitter and three receiver coils. The planes of the coils were oriented horizontally (horizontal coplanar - HCP). The distance between the transmitter and receivers are 0.32 m, 0.71 m and 1.18 m. The measurements were performed with 10 Hz sampling frequency. The area was covered by randomly walked W-E-orientated and N-S orientated tracks with an average spacing of about 0.5 m between the tracks. An RTK-GPS (Stonex S9i) was connected to the device using a fixed fibreglass rod at a distance of 2 m to the coils, minimizing the influence of the electronics on the data. The data was collected July 21st 2020, to image a 17th century wooden ship wreckage in the North Sea tidal flat area west of the island of Hooge(Germany) (Coordinates, geographic WGS84, are provided in the data list).
This is the data from the aerial survey of the monastery area of Ihlow, district of Aurich, to locate archaeological structures on 22.06.2023 (NIhK activity 2023-4). The aim was to locate archaeological features. The photos were taken with a DJI Mavic3M drone with RTK module. The location was measured using Sapos HEPS correction data, resulting in a horizontal position accuracy of 0.01 - 0.02 m and a height accuracy of 0.02 - 0.03 m. The photos were calculated into an orthomosaic using Agisoft Metashape and exported as a multiband raster. The recorded bands correspond to Green (860nm +/-16nm), Red (650nm +/-16nm), Red Edge (730nm +/-16nm) and Near Infrared (860nm +/-26nm).