UAV photogrammetry for volume calculations
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Kuupäev
2020
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Abstrakt
This research assesses the suitability of UAV (Unmanned Aerial Vehicle)
photogrammetry for calculating stockpile volumes and analyses the compliance of the accuracy
of results to current laws. In addition two different UAV’s and two different objects are compared
and the necessity of using GCP’s (Ground Control Points) is investigated. The time spent on each
work stage is also evaluated. Data used in this study was collected in two sites, where the objects
differed in shape, colour and texture. The investigated objects were a regularly shaped peat
stockpile and an irregularly shaped gravel stockpile. Data was collected with a terrestrial laser
scanner, a GNSS (Global Navigation Satellite System) device and two different UAVs. Volume
of the models calculated from different data was compared to the volume of the models based on
laser scanning data for accuracy assessment. Relative errors of all of the photogrammetric models
compared to the laser scanning based model were under 4%. It was concluded that the advantages
of UAV based photogrammetry become apparent as the complexity and size of the measured
objects grow. Results of the study show that using UAV photogrammetry to determine stockpile
volumes is sufficiently accurate with both of the tested UAVs. The results show that without
using GCPs (Ground Control Points), sufficient accuracy was still achieved. Nevertheless
accuracy was increased by using GCP’s. It was concluded that using UAV’s can significantly
reduce the time spent on collecting data for volume calculations, especially when GCP’s are not
necessary.
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Märksõnad
stockpile, 3D modelling, GCP’s, articles