Project Details

Original Data (courtesy of Prof. A.Marini - University of Cagliari - Dep. "Scienze della Terra")

• 5279 x 10881 satellite image (25 m resolution)
• 359 x 681 elevation grid (400 m resolution)

Preprocessed Data

• satellite image texture-mapped on elevation data and resized to fit into machine's texture memory
• elevation data scaled by a multiplication factor of 3
• terrain split into 160 quadrants, 3 levels of detail per quadrant (max. complexity: 108617 triangles, min. complexity: 41987 triangles)
• each quadrant hyperlinked to a higher-resolution version of the surrounding region

Flythrough Features

• Spaceball controls camera position
• Mouse used for hyperlink selection
• Time-critical renderer ensures constant frame rate (10 fps) through hierarchical culling and level of detail selection

The resulting textured 3D model of the Sardinia island can be interactively explored at more than 10 frames/second on a Silicon Graphics Onyx RE2.