The perception of landscapes by the public and the prediction of their evolutions according to management plans become an important source of concern in the decision of rural space or forests managers, farmers and local administrations. The use of Geographic Information System (GIS) makes the geo-referenced data exploitation easier and allows production of bi-dimensional maps. Techniques for tri-dimensional visualization are less developed and are usually deficient for interactivity. Because of the very low forest growth, it is however necessary to use virtual realistic mock-ups of stands with interactive visualization tools to explore and discuss different exploitation scenarios producing effects on several decades. The realism of the forest models is of main importance to reproduce accurate visual environment. However, the resulting data complexity will be hardly handled by modern computer without simplification schemes and several visual artifacts such as aliasing will appear. This project aims at providing some robust interactive tools for virtual forest visualization. We consider very general 3D stand descriptions based on polygonal representations, such as AMAP descriptions, without limit in the variety or types of trees. Various simplification schemes are used to display tree models according to the view point with adaptative level of details. Our techniques are based on the geometric analysis of plant architectural shape and define adaptative representations of this geometry. Several computer graphics methods, such as texture mapping and anti-aliasing algorithm, are used to enhance reality experience in display. The specific methods we use include: (1) use of a multiscale topological structure to define progressive simplification of complex foliage and flowers; (2) multi-resolutional construction of plant branching geometry; (3) level of details and speed of display can be balanced and controlled by user; (4) plant models with high and low simplification rat