Analysis of Disposal Soil Volume Deviations Using Total Station Surveying and UAV Photogrammetry: A Case Study of the Wulan River Improvement Works Project, Package 2

Disposal Photogrammetry Total Station UAV Volume Deviation Wulan River

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October 21, 2026

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Disposal work is a critical activity in construction projects that requires accurate volume measurements to prevent cost overruns and material waste on-site. In the Wulan River Improvement Works Project, Package 2, disposal and excavated material placement activities are carried out on a large scale, requiring an effective and efficient measurement method. Conventional surveying using a total station provides high accuracy through point-based data acquisition but requires relatively long survey times. In contrast, unmanned aerial vehicle (UAV) photogrammetry enables rapid surface data acquisition over larger areas at potentially lower operational costs. This study aims to analyze deviations in disposal soil volume measurements obtained using total station surveying and UAV photogrammetry. Field data were acquired using a total station to establish reference measurements and a UAV to capture aerial imagery. The aerial images were subsequently processed to generate a digital elevation model (DEM) and an orthophoto, supported by ground control points (GCPs) for georeferencing and spatial accuracy. Soil volumes were calculated using the cut-and-fill method based on the resulting digital surface models, and the measurements obtained from both techniques were compared to determine absolute volume deviations and percentage differences. The findings are expected to assess the accuracy of UAV photogrammetry relative to total station surveying and provide recommendations for selecting an effective and efficient method for measuring disposal soil volumes in similar river improvement projects.