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Sensors 2017, 17(8), 1777; https://doi.org/10.3390/s17081777

Accuracy Analysis of a Dam Model from Drone Surveys

DICA Department of Civil and Environmental Engineering, University of Perugia, 06125 Perugia, Italy
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Received: 1 June 2017 / Revised: 27 July 2017 / Accepted: 31 July 2017 / Published: 3 August 2017
(This article belongs to the Special Issue UAV or Drones for Remote Sensing Applications)
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Abstract

This paper investigates the accuracy of models obtained by drone surveys. To this end, this work analyzes how the placement of ground control points (GCPs) used to georeference the dense point cloud of a dam affects the resulting three-dimensional (3D) model. Images of a double arch masonry dam upstream face are acquired from drone survey and used to build the 3D model of the dam for vulnerability analysis purposes. However, there still remained the issue of understanding the real impact of a correct GCPs location choice to properly georeference the images and thus, the model. To this end, a high number of GCPs configurations were investigated, building a series of dense point clouds. The accuracy of these resulting dense clouds was estimated comparing the coordinates of check points extracted from the model and their true coordinates measured via traditional topography. The paper aims at providing information about the optimal choice of GCPs placement not only for dams but also for all surveys of high-rise structures. The knowledge a priori of the effect of the GCPs number and location on the model accuracy can increase survey reliability and accuracy and speed up the survey set-up operations. View Full-Text
Keywords: dam survey; monitoring; UAV; ground control point; marker optimization; dense point cloud; vulnerability analysis; accuracy dam survey; monitoring; UAV; ground control point; marker optimization; dense point cloud; vulnerability analysis; accuracy
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Ridolfi, E.; Buffi, G.; Venturi, S.; Manciola, P. Accuracy Analysis of a Dam Model from Drone Surveys. Sensors 2017, 17, 1777.

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