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ACTA GEODAETICA et CARTOGRAPHICA SINICA, 2007, 
36(2): 152-157. 
[15] Yongguan Xiao, Tiow-Seng Tan, Seng-Chuan Tay. 
Utilizing edge to extract roads in high-resolution satellite 
imagery [A]. IEEE International Conference on Image 
ProcessingfC],Genoa, Italy, ICIP-2005: 1-637-40. 
Parameter selection 
completeness 
correctness 
quality 
RMS 
missing alarm rate 
false alarm rate 
Nm=5, 
N1= Nr=50 
69.25% 
64.9% 
64% 
7 
30.75% 
35.10% 
Nm=10, 
N1= Nr=70 
92.59% 
88.61% 
88% 
1 
7.41% 
11.39% 
Nm=T7, 
N1= Nr=l 19 
93.13% 
97.34% 
93% 
0.4 
6.87% 
2.66% 
Nm=50, 
N1= Nr=350 
31.16% 
83.86% 
31% 
5 
68.84% 
16.34% 
Table 1 the performance of roads extraction 
(d) (b) thinned by the Hilditch algorithm (e) (d) overlay with (a) 
Figure 5: the results of automatic extraction and the images overlaid by original image