A 5ha Magnetic Gradiometry survey revealed the outer walls of the castle 
An Earth Resistance survey revealed high resistance linear anomalies 
Comparing the results of both methods 
Mapping geophysical anomalies and comparing to the previously known layout of the castle (marked with dark red outlines) 
…and comparing to the topography from ALS/LiDAR derived data
The Scientific Association of Polish Archaeologists, Łódź branch (SNAP Łódź) conducted a research project “From Nieszawa to Dybów – non-invasive prospection of the archaeological landscape between Mała Nieszawka and Dybowski Castle”. The study consisted of an application of non-invasive prospection and documentation techniques such aerial photography, LiDAR data, archival photographs, geophysical and geodetic measurements.
Magnetic measurements around the Teutonic castle in Mała Nieszawka revealed numerous anomalies in the vicinity of known stronghold relics, that have been excavated in the 70s and 80s by archaeologists from Museum in Toruń. Magnetic survey captured a number of linear disturbances, testifying to the existence of underground remains of previously unknown fortification structures. In the northern part of the fortifications anomalies were registered indicating the probable outline of the internal courtyards (separated by interwalls) within the complex.
Earth resistance measurements were conducted in the place of observable soilmarks and magnetic anomalies. A linear zone of increased higher resistance was revealed covering much of the observed magnetic anomaly revealing the existence of moats (filled with earth and pushed off brick rubble) and the remains of compact structures (walls).
Project website: https://staranieszawa.wordpress.com/mala-nieszawka-2/