Greetings,
I plan to test the horizontal and vertical accuracy of photogrammetric products generated by direct georeferencing (DG) process (without ground control points - GCP) using a UAV system (Matrix 210 RTK V2, DRTK-2 Mobile Station, Zenmus X7 16 mm).
The official DJI website states that Matrix 210 RTK V2 + Zenmus X7 at a GSD of 2 cm, the produced orthoimages can achieve absolute horizontal accuracy of less than 5 cm using DJI Terra as the mapping software.
If you have used this or a similar UAV system I would appreciate hearing your experiences with the DG process. Respectively, can the RTK option for the above-mentioned UAV system lead to sufficient results (total (XYZ) error < 5 cm) if none of the GCP is introduced?
Also, feel free to suggest papers about this or a similar UAV system (assessment of DG accuracy in a specific case study).
Thank you in advance.
I think GCP's are a necessary component for accuracy assessment. Some issues dealt with in accurate assessment of combining aerial photographs include accounting for elevation(z) and attitude(roll, pitch, yaw) differences in calculations. Typically scaling issues arise where photographs are taken a different elevations. Consider also the accuracy of the GPS used. As an example, is
you can do it but from my point of view if you use GCPs it will be higher
regards
Dear Ivan Marić,
Please check my Researchgate and you will find a paper that I published with my students using DJI phantom-4 for 3D mapping for part of the railway station at Khartoum-Sudan. We used the RTK-GPS to provide the ground control points. And we do have a case study in the paper.
Regards,
Gamal
Dear Julian Simela
thanks for taking the time to answer my question.
„I think GCP's are a necessary component for accuracy assessment.“
I am very aware of the fact that GCPs are a necessary component for accuracy assessment. I am planning to collect an adequate number of them and used them in accuracy assessment for this type of UAVs (Matrix 210 RTK V2 + Zenmus X7).
„Typically scaling issues arise where photographs are taken a different elevations.“
I am aware of this problem. If the terrain inside the case study (mission plan) has high terrain ruggedness index, then the distance or elevation of each photography from the terrain won't be the same. Therefore, I will try to use specific UAV mission planning software which can use precise DEM data of case study (generated in previous research) to increase accuracy and safety of UAVs with terrain following. With that, the UAV would "follow" terrain configuration, and distance (height) while taking the photo would be about the same.
“As an example, is
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