Anchor/LOD Terrains
QuadLOD Terrains
Inline/LOD Terrains
Terrains with Site Models
Interactive Manipulation with the EAI
Composite Datasets

This page contains links to a number of large, multi-resolution terrain databases that have been generated in VRML97 format. These have been created as part of the terrain visualization work being performed at the Artificial Intelligence Center at SRI International.


The datasets are generated from elevation data and ortho-rectified imagery that are recursively subsampled to form a hierarchical pyramid, where each level of the pyramid is half the resolution of its parent. These levels are then segmented into a mosaic of small rectangular tiles and output in VRML97 format. A number of nested LOD nodes are used to produce a level of detail hierarchy where terrain that is closer to you appears in the highest detail while distant terrain appears in lower resolution.

All of these datasets were produced using the tsmApi library from SRI International. This library is freely available for users to download and use to produce their own terrain datasets.

If you don't have a VRML Browser installed on your computer, then you should be able to find a suitable one for your platform from the VRML Repository Browser Page. We recommend the use of Cosmo Player 2.1 with Netscape Communicator 4.x. You can download a copy of Cosmo Player 2.1 for Windows from



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For more information, please contact: digital-earth@ai.sri.com.
Last updated: Monday, 07-Jan-2002 06:58:36 PST.