Table 4.

A comparative summary of the data acquisition platforms used for RCM.

Platforms	Advantages	Limitations
UAVs	Well-matched for aerial reconnaissance. Unhindered large field of view. Allow for navigation through difficult terrains. Facilitate safe and quick inspections.	Unsuitable for RCM in dense traffic roadways. Limited by weather conditions, such as wind speed and harsh climate.
Smartphones	Lightweight sensors. Ease of employability due to their size. Stand-alone (hand-held device) data acquisition method and can be easily installed on vehicles.	Limited by image resolution. Suffer noisy data due to external factors.
Ground robots	Extensive usability in dense traffic areas. Scalable platforms for multi-array sensors. Find widespread serviceability in RCM.	Limited by a small field of view. Poor cost-effectiveness in terms of long hours of operation and resources.