Study on the Key Technique of the Hill Shading Virtual Roaming System Based on XNA - Advances in Image and Graphics Technologies - page 236

Table 2 . Height-color mapping table

Height(m) height(m) height(m)

color value color value color value

1600 52,0.99,1 10

8900 0,0,1 130,1,0.3

1000 84,1,0.9 5

6400 359,0.02,1 136,1,0.25

600 100,1,0.9 -5

5000 295,0.13,0.62 180,0.5.0.8

100 110,1,0.6 -30

4000 0,1,0.83 200,1,1

3500 16,0.95,0.82 50 120,1,0.5 -100 240,1,1

3000 24,0.75,0.88 30 126,1,0.4 -11100 250,0.5,0.5

2400 43,1,1

Figure 9-13 is a group of representing effects of hill shading by prototype roaming
system with the parameters in above height-color mapping table.

Fig. 9. Overview of prototype roaming system(LOD at Level 1 )

Fig. 10. Shading effect (LOD at level 3 Fig. 11. Shading effect(LOD at level 5)
azimuths of the sun =225° azimuths of the sun =225°
altitude of the sun =30° altitude of the sun =30°