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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B5. Beijing 2008 
The high efficiency can be seen by comparison with other 
method. It is well known that aerial photogrammetry is more 
efficient in comparison with terrestrial surveying for road 
mapping. So we just compare our method with aerial 
photogrammetry for getting mapping efficiency. From the table 
2, aerial photogrammetry needs about 1.6 day/person for one 
kilometer data, but our method just needs 0.2 day/person, which 
is 8 times of mapping efficiency. And not just saving mapping 
time, our method can get denser road spatial data than aerial 
photogrammetry like road sign. From the two aspects, it is clear 
that our method is efficient method for capturing 3D road 
spatial data. 
Aerial Photogrammetry 
Our Fusion-based Method 
Course Length 
9.5Km 
Course 
Length 
lOKm 
Photo Taking 
0.5 day/person 
Data 
Capturing 
0.5 day/person 
GCP 
Surveying 
6.0 day/person 
Geo- 
Positioning 
0.5 day/person 
Aerial 
Triangulation 
0.8 day/person 
Result 
Editing 
1.0 day/person 
Field 
Investigation 
6.0 day/person 
- 
- 
Mapping 
1.0 day/person 
- 
- 
Editing 
1.0 day/person 
- 
- 
Total 
15.3 day/person 
Total 
2.0 day/person 
Mapping 
Efficiency 
1.6 
day/person/km 
Mapping 
Efficiency 
0.2 
day/person/km 
Table 2. Mapping Effectiveness in Comparison 
with Aerial Photogrammetry 
The high efficiency of our method also can be found in the 
following table 3. The table compares our fusion-based method 
with the method which just uses CDD stereo image. Because 
the automation ratio of image-based method is much less than 
our fusion-based method, it spends more time in manual editing 
of extracted results. From this comparison, it is clear that 
fusion-based method is an efficient solution for 3D road 
mapping. 
Image-based Method 
Our Fusion-based Method 
Course 
Length 
10 Km 
Course Length 
lOKm 
Data 
Capturing 
0.5 day/person 
Data Capturing 
0.5 day/person 
Geo- 
Positioning 
2.0 day/person 
Geo- 
Positioning 
0.5 day/person 
Result 
Editing 
3.5 day/person 
Result Editing 
1.0 day/person 
Total 
6.0 day/person 
Total 
2.0 day/person 
Mapping 
Efficiency 
0.6 
day/person/km 
Mapping 
Efficiency 
0.2 
day/person/km 
Table 3. Mapping Effectiveness in Comparison 
with Image-based Method 
ACKNOWLEDGEMENTS 
The authors would like to express the appreciation to the De 
tech Co. Ltd and their staffs for kindly cooperating with 
experiment and the other relative support through this work. 
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