Geo_Drone
Core User of DJI
Flight distance : 2733720 ft
Romania
Offline
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LV_Forestry Posted at 5-20 04:10
At least we agree on that.
For the 2cm of accuracy, can you confirm that you are talking about absolute measurement on a 3D model or a Raster?
PS1: I forgot: 2-3 cm on generated 3D model. Applies to standard distances like left-right and up-down. For calibrated distances inside 3D model, like models you have that enters in angles to inside, you need a LIDAR, cannot be precise as you cannot control them enough. (example: a window measured will have precision....a decoration that is under roof and enter in angle into house you will have errors because of planarity - sorry for english, is not my native).
PS 2: Yes, we have measured also roads and distance between different obstacles to provide the map for them, the measurement in the model map was with deviations of + - 2 cm from reality.
The +- 5 cm were achieved in angled 2 sides areas, where we compensated with 2 GCP on both plane of inclining, but at that points you need a backed RTK for cm accuracy. As we had an order for tolerance +- 10cm, was not an issue. |
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