Spatial planning of observation sensors on inland waterways requires creating a 3D map of water area, on which basis defining an initial position of a CCTV camera or radar is possible. Bearing in mind the spatial character of planning, such a map should represent in a proper way real objects in aspect of their identification as well as visibility analysis. In case of creating different map objects the most difficulties occurred during process of trees modeling. Taking in consideration their quantity and importance in spatial planning of sensors, developing adequate models and their implementation in 3D map required applying diversified geometric representation. The level of model details related mainly with the character the water area, which can be classified as urbanized, not urbanized or port terrain. Referring to the CityGML standard, vegetation can be represented in the form of individual vegetation model (eg. single tree) or the models representing their groups (eg. wooded area). In the case of urban and port areas single trees or their small groups are dominating, while in the non-urbanized terrain wooded areas are dominant. Accordingly, the article presents methods for threes modeling adapted to the type of terrain, which amounted to developing appropriate surface models and individual tree models. The creation of appropriate tree models adapted to the nature of the area allowed for the appropriate spatial analysis using a dedicated three-dimensional map.