Fifth International World Wide Web Conference
Original Terrain Model
Color
: Landsat scene, 5279 x 10881 pixels, bands 3 2 1 (RGB) [30 m resolution resampled to 25 m]
Elevation
: 359x681 regular grid [400 m resolution]
Much too big
for interactive exploration
Brute-force rendering would require 500K triangles/frame
Impossible to meet latency and visual feedback constraints even with high-end machines
At least ten frames per second required to give the illusion of smooth motion
Need for
data reduction
and
multiresolution viewing
Virtual Sardinia: A Large-Scale Hypermedia Regional Information System
(E.Gobbetti,A.O.Leone)
Fifth International World Wide Web Conference