The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part Bl. Beijing 2008 
would send the surveillance exception information to PC client, 
and then PC client would direct PDA client to carry out the 
work of fieldwork investigation and emergency response. 
Meanwhile, the database service of collaborative server is 
providing continuous data and information exchange service for 
server, PC client and PDA client. Figure 2 shows the 
collaborative working flow of prototype system. 
Figure 2. Collaborative working flow of prototype system 
Real geographical data and simulating disease data are used in 
this experiment of prototype system, and spatial scan statistics 
results of surveillance module in different scales are shown in 
Table 2. Moreover, Figure 3 shows the epidemical surveillance 
computing program of collaborative server, including multi 
scale surveillance computing results. Intelligent disease 
diagnosis module and fieldwork response module of PDA client 
are shown in Figure 4 and Figure 5 respectively. 
Figure 3. b) Epidemical surveillance computing program of 
collaborative server (scale: province) 
Figure 3. c) Epidemical surveillance computing program of 
collaborative server (scale: county) 
Figure 3. a) Epidemical surveillance computing program of 
collaborative server (scale: state) 
Hotspot Cluster: 1 
Cluster type 
Circle 
Centre Name 
Guangxi Province 
Centre Code 
450000 
Centre Longitude 
108.312 
Centre Latitude 
22.8061 
Radius 
0.382493 
Population Number 
117635283 
Observed Cases 
695 
Expected Cases 
286.895 
LLR 
21.134766 
Relative Risk 
7.892134 
P 
0.001 
Table 2. a) Spatial scan 
statistics results (scale: state) 
Hotspot Hotspot 
Cluster: 1 Cluster: 2 
Cluster type 
Circle 
Circle 
Centre Name 
Youping 
Longtou 
County 
County 
Centre Code 
45102808 
45142101 
Centre Longitude 
106.540440 
107.961732 
989