## 7 Conclusions
The authors discussed the efficiency of the presented approach, which relies on the combined use of written data and remote sensing data for ground stability assessment. The authors found that in areas that were subject to shallow mining exploitation a hundred years ago and where sinkholes were documented on old maps, no negative changes in height were observed (except for a small zone in an area of the Gustav 2 shaft). And this stability of the ground surface exists there despite the presence of gravity anomalies. The determined gravitational and topographic effect at the site of the old exploitation, in the light of the data on vertical displacements, should be treated as a \"scar\" in the structure in the near-surface part of the deposit, which has no--or only a negligible--influence on surface movements which have been caused by the uplift of the diapir in this part of the area. The results of this research do not indicate any occurrence of subsidence in the short term in areas of old exploitation and old sinkholes. One of the possible reasons for subsidence could be associated with the development of flooded or buried caverns, which could produce potential threats to the ground surface. However, in the long term, due to the natural degradation processes of the roof part of the dome, such a threat should be taken into account, especially in certain places such as old production wells, shafts, and sinkholes. The aim of this work was not to introduce new techniques and analyze their possibilities, but to apply them to a specific problem in a city with a rich history. An unintended result was the determination of diapiric movements caused by the Inowroclaw salt dome, and the obtained results correspond to those previously discussed by the authors [26]. Therefore, this is another work documenting the movements of this diapir, which is thus far the only diapir in the European Zechstein salt formation with such documented tectonic activity. Moreover, this work can be considered the first to use the LIDAR technique for this issue and in this area. While examining height changes, the authors have found that their spatial and temporal distribution was complex, as the mechanism that controls the analyzed displacements is multifaceted and most likely not driven by a single cause. However, the analysis of long-term data allows us to capture the trend; although it is complex, it clearly indicates an increase in the size of the area subject to uplift in subsequent years. The research results can be used as an example to conduct analogous analyses of vertical displacements of the ground surface using various types of DTM data. In the case under discussion, these results can be used by Inowroclaw authorities as a substantive basis for an assessment of a new category of spatial development zones. Due to the ever-present possibilities of geohazards, we feel that our research will help the authorities conduct an assessment which takes into account the current state of the surface deformation. **Author Contributions:** Conceptualization, Z.S. ; Methodology, R.G. ; Validation, Z.S. ; Formal analysis, Z.S. and R.G. ; Investigation, Z.S. ; Writing--review & editing, Z.S. ; Visualization, R.G. All authors have read and agreed to the published version of the manuscript. This research received no external funding. **Institutional Review Board Statement:** Not applicable. **Informed Consent Statement:** Not applicable. **Data Availability Statement:** The data was downloaded from [[https://mapy.geoportal.gov.pl/imap/Imgp_2.html](https://mapy.geoportal.gov.pl/imap/Imgp_2.html)]([https://mapy.geoportal.gov.pl/imap/Imgp_2.html](https://mapy.geoportal.gov.pl/imap/Imgp_2.html)) (accessed on 28 March 2023). **Acknowledgments:** Special thanks to Head Office of PBG Geophysical Exploration Ltd. for making available the postprocessed data. We thank [PERSON] for the help with technical preparation of the manuscript. **Conflicts of Interest:** The authors declare no conflict of interest.