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Table 2

Comparison of the three inspection methods

CCTVManhole cameraUAV
Number of days needed 
Number of manhole openings 30 36 15 
Average inspection path per manhole 1.0 0.8 2.0 
Average of inspected length per manhole 44.16 36.8 88.32 
CCTVManhole cameraUAV
Number of days needed 
Number of manhole openings 30 36 15 
Average inspection path per manhole 1.0 0.8 2.0 
Average of inspected length per manhole 44.16 36.8 88.32 
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