Mesh refinement for 3D terrain visualization

Huan Chi Chiu, Fuan Tsai

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Terrain is one of the most important objects in cyber city visualization. For a large scale or detailed terrain visualization, the vast amount of data may lead to lower efficiency. Using multiple levels of detail (LOD) to present the same area based on viewing conditions and user requirements is a commonly adopted strategy for improving terrain visualization performance in assorted applications. However, when applying tile-based LOD to large-scale landscape visualization, there are still a few issues needed to be addressed. Firstly, conventional LOD systems often divided the data set into small tiles geographically. This may result in poor performance or abrupt LOD changes when dealing with large-area visualization projects, especially during the initial stage. A nested LOD system was developed to create a finer set of LOD tiles and a coarser LOD set for quick representation of large areas. Secondly, when visualizing a terrain by mesh tiles, there are usually discontinuities along tile edges, causing so-called T-junctions. A mesh-merging algorithm was proposed to refine the determined LOD meshes in order to eliminate T-junctions. This will produce seamless landscape scenes consisting of multiple tiles of different LOD layers. Experimental results with an area of 80,000 km 2 at 40m×40m resolution DEM data set indicated that the developed visualization system can provide better adaptive LOD transitions. The system can also eliminate T-junctions along tile edges, providing more continuous and smooth landscape scenes during a fly-through or other visualization tasks.

Original languageEnglish
Title of host publication28th Asian Conference on Remote Sensing 2007, ACRS 2007
Number of pages6
StatePublished - 2007
Event28th Asian Conference on Remote Sensing 2007, ACRS 2007 - Kuala Lumpur, Malaysia
Duration: 12 Nov 200716 Nov 2007

Publication series

Name28th Asian Conference on Remote Sensing 2007, ACRS 2007


Conference28th Asian Conference on Remote Sensing 2007, ACRS 2007
CityKuala Lumpur


  • Cyber City
  • Digital terrain model
  • Nested LOD
  • Visualization


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