DOI: 10.11118/ecos2026_025

INTERACTIVE TRANSFORMATION OF LAYERS IN 3D TILES FORMAT WITHIN A WEB GIS APPLICATION

Markéta Nedělová¹, Ivo Pisařovic¹

¹ Department of Informatics, Faculty of Business and Economics, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic

The paper deals with the design and implementation of an extension to the Spatial Lens web application, which is used to prepare 3D educational materials displayed in virtual reality. The subject of the extension is editing spatial layers stored in the 3D Tiles format, specifically their displacement, rotation and scaling directly in the scene preview, which eliminates the need to use external tools. Three-dimensional geodata is not always perfectly prepared for a specific scene and may have a different axis orientation or incorrect scale. The entire 4×4 transformation matrix is not transferred between the frontend and backend, but a more economical data structure containing the position (longitude, latitude and altitude), rotation and scale. This solution reduces cumulative rounding errors, increases accuracy for large numbers, and facilitates input validation. The backend recalculates the resulting matrix each time from the beginning from the saved original matrix and a stable pivot point, thus ensuring idempotence of repeated saves. The usability of the extension was verified through scenario-based user testing with ten participants. The results confirm the usability of the tool while identifying areas for further improvement of the user experience.

Keywords: 3d tiles, cesiumjs, web gis application, spatial data transformation

pages: 242-249, online: 2026