N An overview of methods and models for triangle based surfaces is presented. The various models can be discriminated by how the surface is partitioned into triangles, how the triangles are aggregated and refined for generating levels of detail and how the continuity of the surface is preserved through the detail levels. Special consideration is given to view dependent level of detail, where the detail requirement is dependent on the relative position between the observer and a part of the surface. Multi-resolution techniques for consistent management of terrain and network data Morten Fimland, University of Oslo, N Issues and methods within consistent modeling of geographical data are presented. Consistency problems arise when terrain and network data are managed seperately.
Errors typically occur because the data sets are of different resolution and different sources.
Methods based on integration of terrain and network data can be used to resolve errors in the data sets. After a consistent integrated data set is ensured, multi-resolution data that maintain their consistency can be derived using a data reduction strategy.