Drones offer many advantages over traditional methods on site. The list below covers just a few of them.
 1. Assist with pre-construction site review.
2. Aerial surveying and mapping.
3. Measurement of excavation depths and material stockpiles.
4. Monitoring and documenting jobsite progress.
5. Productivity, safety and security.
6. Inspection work of structures on site that may need clearing or hard to reach areas.
7. Lower physical risks to workers on site.
8. Allow contractors to take affordable aerial photography.
9. Improve overall efficiency and reduce costs.
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  Below are some useful links to give you more information.