4D Models in World Wide Web

The paper presents some results of research curried out within the framework of the European project named "Cultural Heritage Through Time" (CHT2). One of the main project aims were to develop a methodology for sharing multi-temporal information via the Internet (webGIS) for remote analysis of structures and landscapes over time. Reported in this paper results are focused on testing two technologies (Hexagon and Esri) for online publication 3D models using as an example Fort Citadel 2 "Ko?ciuszko". The problems that were encountered and the examples of their solution are given. The main limitation in 4D web publishing is data volume and some simplification procedure should be involved.