PHOTOGRAMMETRIC SURVEYING AND 3D MODELING USING UNMANNED AERIAL VEHICLE ( DRONES ) --- PART 3 ( UAV VOLUMETRIC ANALYSIS )

Volumetric analysis and Calculation for Accuracy check for UAV acquired Images

Volume measurement with is an extremely fast, accurate and cost-effective method to analyse volumes on our maps from any device. User tests have found that volume measurements with UAV acquired are accurate within 1-2% of traditional ground-based measurements.   PhotoScan calculates area of the surface as a  sum of areas for all the faces in the model, so if we have closed volume prior to calculation bottom area will be also calculated. Also note that side polygons will be also taken into account, so the result will be greater than area of 2D projection of the model to the XY plane.

Fig:selected area for volume calculation

Fig:selected area-close holes and calculated volume

Fig: sand on the ground (selected for volume calculation)

 

Fig:Part on the ground selected for volume calculation

Fig:  Actual view of the selected portion

 

Fig: volume calculation (close hole)

Negative value indicates than the surface normal are pointed inside the model as it is depth volume calculation. And it is a common situation for quarries or interior projects. The area selected was around 125.5 meter square and volume is 9.78 meter cube.