Geoscience Reference
In-Depth Information
Road Class
Length
1
1
0.8
0.8
0.6
0.6
0.4
0.4
0.2
0.2
0
0
0
200
400
600
800
1000
1200
1400
0
200
400
600
800
1000
1200
1400
Number of selected strokes
Number of selected strokes
Degree
Closeness
1
1
0.8
0.8
0.6
0.6
0.4
0.4
0.2
0.2
0
0
0
200
400
600
800
1000
1200
1400
0
200
400
600
800
1000
1200
1400
Number of selected strokes
Number of selected strokes
Betweenness
1
0.8
0.6
0.4
0.2
0
0
200
400
600
800
1000
1200
1400
Number of selected strokes
Figure 3 : The distributions of similarity by using five properties
These distributions in figure 3 show that, at first, the value of similarity
increases quickly along with an increasing of the number of selected
strokes. It illustrates that most of the selected strokes are also retained in
the corresponding benchmark. Then, the value of similarity begins to
decrease after passing a peak (or a maximum value). This means some
unretained strokes (in the corresponding benchmark) are also selected.
Further, it is found that there are only two sample points when using road
class. It is because that this experimental data only has two different road
classes, main road and secondary road. Obviously, it has more sample
 
 
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