International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B3, 2012 
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia 
2. For the road extraction, the thickness of the layer and 
layer's step size is very important. In order to get 
better result, we need a dynamic thickness and step 
size generation method. 
3. ACKNOWLEDGEWMENT 
Work described in this paper was funded by 973 Program 
(2011CB707102); National Natural Science Foundation of 
China (40901220, 41001302); Fok Ying Tong Education 
Foundation (122025). 
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