A stream-based Parasitic Model for implementing Mobile Digital Earth

Figures & data

Figure 1. Framework of the Parasitic Model.

Figure 2. Process map of the adaptive transfer strategy.

Figure 3. Coding format of a user's interactions.

Figure 4. Package format of encoded operations.

Figure 5. Snapshots of MDE functions: (a) Interface (global view); (b) regional terrain; (c) visualization of a tornado; (d) virtual reality of the sea; (e) underwater simulations and (f) simulation of fire.

Table 1. Amount of output data for different source dimensions (ColorBit = 3).

		Bitrate
Source render region	Destination media region	400,000	800,000	1,150,000	1,500,000
128×96	256×192	1578	1312	1578	1578
256×192	256×192	3274	3286	3281	3292
512×384	256×192	2622	2470	2691	2570
1024×768	256×192	1968	1838	1804	1858

Table 2. Amount of output data for different source dimensions (ColorBit = 4).

		Bitrate
Source render region	Destination media region	400,000	800,000	1,150,000	1,500,000
128×96	256×192	1578	1581	1581	1578
256×192	256×192	3447	3261	3261	3251
512×384	256×192	2526	2524	2521	2511
1024×768	256×192	1934	1940	1942	1926

Figure 6. Data output as a function of the original dimension: (a) ColorBit = 3; (b) ColorBit = 4

Figure 7. Time costs of the two alternative approaches: (a) time expended composite between the two alternative approaches and (b) Network traffic between the two alternative approaches

Table 3. Data traffic reduction achieved using the Parasitic Model.

Scene ID	Original geographic data (bytes)	Data transferred to mobile phone (bytes)	Reduction ratio (%)
1	518,910	2738	0.53
2	467,002	3770	0.81
3	251,401	4471	1.78
4	569,875	4777	0.84
5	382,806	2030	0.53
6	510,167	4195	0.82
7	477,360	4191	0.88
8	487,370	3951	0.81
9	456,573	3303	0.72

Figure 8. MDE performance using different networks.

Figure 9. MDE performance under ActiveSync and WCDMA.