The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B4. Beijing 2008 
295 
(c) the new or changed roads 
(d) the disappearance roads 
h- 
pi 
(e) the generalization disappearance 
Percentage 
Types of 
updates 
Percentage 
(item/road 
Length 
(item / 
updates) 
length 
before 
updating) 
New or 
changed 
125.3 
56.34% 
11.97% 
Disappearance 
9.3 
4.19% 
0.89% 
Generalization 
disappearance 
87.8 
39.47% 
8.39% 
Total 
222.5 
100% 
21.25% 
Total length of 
roads before 
updating 
Total length of 
1047.2 
roads after 
1075.4 
updating 
Table 1 Statistics for updates and road data (Length unit: Km) 
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Figure 6. Road data, updates and road data updated