In: Wagner W., Szdkely, B. (eds.): ISPRS TC VII Symposium - 100 Years ISPRS, Vienna, Austria, July 5-7, 2010, IAPRS, Vol. XXXVIII, Pan 7B 
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possible to recover parts of roads that have been eliminated. 
The results are shown in figures 02 and 03. 
This is due to the spectral similarity between some parts of the 
road and vegetation present in the scene. Thus, to segment the 
image in order to eliminate the vegetation, parts of the road 
were also eliminated. 
Thus, the road must be completed. The process of filling by 
calculating the Euclidean distance can be seen in Figure 04 e 
05. It is observed that the areas highlighted in both figures have 
not been the appropriate completion. 
Figure 04: Euclidian distance - stretch 01 
Figure 05: Euclidian distance - stretch 02 
This fact is due both to the curvature of the road, and the 
amount of road lost in the segmentation process. The 
morphological closing operator was applied to correct such 
failures. The Figure 06 and 07 present the results. The same 
areas were highlighted in both figures to verify the result. 
After applying the closuring operator, was possible to define the 
linear feature complete, in this case the complete road. 
However, the road was still showing a dilated form, requiring 
the operator's application of erosion operator to obtain a road 
consistently. The result can be seen in Figures 08 and 09.