Hi, this is one paragraph I wrote that may help you. Additional references are at the end.

"The imagery should be acquired in systematic flight-lines with an approximate 20% to 30% overlap in homogeneous areas as recommended (Meinen and Robinson 2020) and above 70% overlap in heterogeneous areas as recommended by (Clapuyt et al. 2017) following previously defined ground control points (GCPs) as recommended by (Agüera-Vega, Carvajal-Ramírez, and Martínez-Carricondo 2017; Cabreira, Brisolara, and Ferreira Paulo 2019) while capturing downward-facing photographs."

If I have to be extremely general I would recommend a 50-60 m flight height. This is strongly dependent on the camera less angle and the area you want to cover.

References

Agüera-Vega, Francisco, Fernando Carvajal-Ramírez, and Patricio Martínez-Carricondo. 2017. “Accuracy of Digital Surface Models and Orthophotos Derived from Unmanned Aerial Vehicle Photogrammetry.” Journal of Surveying Engineering 143(2): 04016025.

Cabreira, Tauã M., Lisane B. Brisolara, and R. Ferreira Paulo. 2019. 3 Drones Survey on Coverage Path Planning with Unmanned Aerial Vehicles.

Clapuyt, François, Veerle Vanacker, Fritz Schlunegger, and Kristof Van Oost. 2017. “Unravelling Earth Flow Dynamics with 3-D Time Series Derived from UAV-SfM Models.” Earth Surface Dynamics 5(4): 791–806.

Meinen, Benjamin U., and Derek T. Robinson. 2020. “Mapping Erosion and Deposition in an Agricultural Landscape: Optimization of UAV Image Acquisition Schemes for SfM-MVS.” Remote Sensing of Environment 239(January): 111666. https://doi.org/10.1016/j.rse.2020.111666.

O’Connor, James, Mike J. Smith, and Mike R. James. 2017. “Cameras and Settings for Aerial Surveys in the Geosciences: Optimising Image Data.” Progress in Physical Geography 41(3): 325–44.

Respectfully,

J

Dear Mohammadhasan Naseri,

Your flight height will be less than 50m. for the greater resolution and accuracy and overlapping percentage more than 60% is well enough to identify the objects properly.

I think keep in your mind if you increase height more than 50m then it will create problem for overlapping.

Best wishes with regards,

Suraj

Suraj Kumar Mallick

Hi dear friend

Thanks for your helpful answer.

I have images taken with an eBee drone with a flight altitude of 110 meters and 60% overlap. The processing results were not satisfactory to me and the ortho became complicated when zooming.

Yes. The problem should be the high altitude of the flight.

thanks for your help

Jhony Benavides Hello

Thank you for the accurate answer with your exact source of information

We wish the best for you