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Accuracy of unmanned aerial vehicle (UAV) and SfM photogrammetry survey as a function of the number and location of ground control points used

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journal contribution
posted on 15.11.2018, 11:50 by Enoc Sanz-Ablanedo, Jim Chandler, Jose R. Rodriguez-Perez, Celestino Ordonez
The geometrical accuracy of georeferenced digital surfacemodels (DTM) obtained fromimages captured bymicro-UAVs and processed by using structure frommotion (SfM) photogrammetry depends on several factors, including flight design, camera quality, camera calibration, SfM algorithms and georeferencing strategy. This paper focusses on the critical role of the number and location of ground control points (GCP) used during the georeferencing stage. A challenging case study involving an area of 1200+ ha, 100+ GCP and 2500+ photos was used. Three thousand, four hundred and sixty-five different combinations of control points were introduced in the bundle adjustment, whilst the accuracy of the model was evaluated using both control points and independent check points. The analysis demonstrates how much the accuracy improves as the number of GCP points increases, as well as the importance of an even distribution, how much the accuracy is overestimated when it is quantified only using control points rather than independent check points, and how the ground sample distance (GSD) of a project relates to the maximum accuracy that can be achieved.

Funding

This work was supported by the University of Leon through Convocatoria de Ayudas para el Fomento de la Publicacion en Acceso Abierto a Profesores de Nueva Incorporacion, 2018 and by Estancias de movilidad en el extranjero “Jose Castillejo” para jovenes doctores (2017), from Ministerio de Educacion, Cultura y Deporte, Gobierno de Espana.

History

School

  • Architecture, Building and Civil Engineering

Published in

Remote Sensing

Volume

10

Issue

10

Citation

SANZ-ABLANEDO, E. ... et al, 2018. Accuracy of unmanned aerial vehicle (UAV) and SfM photogrammetry survey as a function of the number and location of ground control points used. Remote Sensing, 10 (10), 1606.

Publisher

MDPI AG © The Authors

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Publication date

2018

Notes

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

eISSN

2072-4292

Language

en

Licence

Exports