461 
In: Wagner W., Székely, B. (eds.): ISPRS TC VII Symposium - 100 Years ISPRS, Vienna, Austria, July 5-7, 2010, IAPRS, Yol. XXXVIII, Part 7B 
At the end of the process the roads were overlaid with the 
classified image in order to check the area filled by the 
algorithm. 
Figure 10: Overlay - stretch 01 
6. CONCLUSIONS 
The roads extracted still need to be refinement, because the 
edges have not yet obtained homogeneity along the stretch. 
Further tests must still be performed, since the methods and 
techniques used to extract features vary by area of study and 
type of image being used. The results are satisfactory as it was 
possible to fill the roads with the use of mathematical 
morphology and the result is close to the classification made. 
The extraction using mathematical morphology showed good 
performance, and only need the panchromatic band for its 
realization. 
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