---

• Introduction
• Related work
• The Multi-Triangulation
• The Architecture of VARIANT
• The MT-Manager
  • Data structure
  • Construction operations
  • Query Operations
  • I/O Operations
  
  
• Query Parameters
• The MT-Generators
  • Refinement and simplification techniques
  • Local updates
  • Selection of updates and accuracy criteria
  
  
• The MT-Clients within VARIANT
  • Interactive Terrain Visualization
  • Contour Lines
  • Visibility
    • Point-to-Point Visibility
    • Viewshed Computation
    • Horizon Computation
  
  
• Conclusions and Future Work
• References

---