Issue - Volume measurements of stockpiles are off by 5-10% (volume lower when measuring after a snowfall (about 2 inches) Images captured with drone.
First project - No snow. Capturing the images from 50m. Double grid mission and 80% overlap. Volume measurement result only 1,8% from previous traditional measurement method which were done with RTK-GPS.
Second project - About 2 inches of snow on the stockpile. Capturing the images from 100m. Single grid mission and 85% overlap. Volume measurement shows almost 10% less volume compared to the first project.
Comments: I flew higher the second time since that the recommendation when the area is homogeneous.
BTW, when I upload the same series of pictures to DroneDeploy the DSM looks better and the volume measurement is only 1-2% apart from previous measurement.
- Would the accuracy improve if the images are captured from a lower altitude?
- Would double grid provide a higher detail of the DSM?
- Are there some “tweaks” during processing in Pix4Dmapper which could improve accuracy?
DSM in first project. High level of detail.
DSM from second project. Less detail.