## 4 Conclusions  
The study proved the effectiveness of the proposed methods for spatial imaging of the terrain surface and the bottom of the marina. In many cases, classic maps, due to their two-dimensional nature, do not allow for a clear representation of several elements on a single image. This problem is particularly notable from the perspective of the current and future development of measuring devices collecting spatial data. The authors in the study combined the current state of knowledge and technology to create three-dimensional thematic map visualization (T3 DMI). The resulting harmonized dataset, consisting of the TLS point cloud, bathymetric survey, and the bottom model with isobaths is a comprehensive representation of both the seab and land objects. The three-dimensional numerical properties of the data enable wide access to spatial information about the marina. Working in the georeferenced point cloud space not only allows for the calculation of geometric measures (distance, area, volume) but also the reading of the values of horizontal and vertical orthogonal coordinates. An additional grid of images of meridians and parallels indicate the values of the curvilinear coordinates of latitude and longitude. Given the feature of a wide spectrum of thematic map applications, T3 DMI imaging has been profiled for the information needs of the NSC marina. The location of the key objects for marina management was defined using selected projections. The use of a perspective view is a new quality of map imaging that serves as a kind of three-dimensional thematic map. It should be clearly emphasized here that the classic map definition only applies to two-dimensional imaging, hence the terming T3 DMI as a map would be incorrect. The combined representation of separate elements of the real world in the form of a single spatial dataset is a new quality of imaging. Further research directions of the proposed solution could be the creation of an interactive database, which should be updated at regular intervals. An important functional element would be providing access to the database in the form of a mobile application. Using the example of the T3 DMI of the marina described in the publication, the user would be able to assess the possibility and safety of mooring to the quay. The application could have additional functionality in the form of free berths. An important limitation for internet data transmission is the large size of point clouds. However, the preparation and implementation of three-dimensional models in the database would significantly minimize this problem. The added value of the study is to suggest a new way of presenting both the Earth's surface and natural or anthropogenic objects. The solution presented by the authors combines both theoretical and practical aspects of the issue. The process of creating T3 DMI visualization uses, among other mathematical properties of cartographic projections, the theory of height systems, three-dimensional coordinate transformations, and advanced methods of spatial modeling. The spatial dataset can be used as a universal basis for creating other products dedicated to the individual needs of recipients. Given the rapid development of measurement technologies, the presented methodology of spatial data processing is an important direction in object visualization, using selected features of cartographic mappings. Conceptualization, C.S. and P.S.D. ; Methodology, P.S.D. ; Software, P.S.D. ; Validation, C.S., M.S. and A.M.; Formal Analysis, P.S.D. ; Investigation, P.S.D. ; Resources, A.M., M.S. and P.S.D. ; Data Curation, A.M., M.S. and P.S.D. ; Writing--Original Draft Preparation, P.S.D. ; Writing--Review & Editing, P.S.D., C.S., M.S. and A.M.; Visualization, P.S.D. ; Supervision, C.S. and A.M.; Project Administration, C.S. ; Funding Acquisition, C.S. All authors have read and agreed to the published version of the manuscript. This research was funded from the statutory activities of Gdynia Maritime University, grant number WN/2021/PZ/05. Not applicable.