Abstract
Digital Aerial Photogrammetry from Unmanned Aerial Vehicle (UAV-DAP) based on Structure from Motion Multiview Stereo (SfM-MVS) approach has demonstrated to be an efficient technique to meet the needs of highly accurate monitoring and forest sustainable management. In this work, a methodology based on UAV-DAP to generate high quality Digital Terrain Models (DTMs) in Mediterranean forest has been developed. UAV overlapping images were collected over eighteen Aleppo pine (Pinus halepensis Mill.) square plots of 100 m side (1 ha) located at Sierra de María-Los Vélez Natural Park (Almería, Spain). These plots were divided into 31 references subplots of 25 m side. The workflow devised to generate the corresponding DTMs consisted of: (i) SfM-based image aligning, (ii) point cloud generation, (iii) ground points filtering, (iv) outliers removal, and (v) DTM interpolation from previously labeled ground points. A very accurate reference DTM, derived from terrestrial laser scanning (TLS), was employed to accomplish the image-based DTM vertical accuracy assessment. The obtained results showed that the UAV image-based DTMs presented a reasonably low vertical bias of −9.38 cm, which meant that UAV-DAP DTM overestimated the z reference ground values provided by TLS. In addition, a low vertical random error of 4.68 cm (average value for all subplots in terms of standard deviation) was computed from the z-differences population. According to these results, UAV image-based DTM can be considered well suited to serve as ground reference to support Mediterranean forest inventories.
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Acknowledgements
This study was funded by the following projects: (1) “Enabling interdisciplinary collaboration to foster Mediterranean forest sustainable management and socio-economic valuation (ECO2-FOREST)” (“Proyecto Retos Junta de Andalucía, Spain. Grant number P18-RT- 2327”). (2) “Intervention strategies for an integrated and sustainable management of the Mediter- ranean forest based on an interdisciplinary analysis and its economic assessment” (“Programa Operativo FEDER Andalucía 2014-2020, Spain. Grant number UAL2020-SEJ-D1931”). “The au- thors wish to thank the support of the Territorial Delegation in Almeria of the Ministry of Agri- culture, Fisheries and Sustainable Development of Andalusia. Special thanks are due to Jaime de Lara, Director-Conservator of the Natural Park of Sierra de María-Los Vélez. Finally, this work takes part of the general research lines promoted by the Agrifood Campus of International Excel- lence ceiA3, Spain (http://www.ceia3.es/)”.
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Nemmaoui, A., Aguilar, F.J., Aguilar, M.A. (2023). UAV-Based Digital Terrain Model Generation to Support Accurate Inventories in Mediterranean Forests. In: Cavas-Martínez, F., Marín Granados, M.D., Mirálbes Buil, R., de-Cózar-Macías, O.D. (eds) Advances in Design Engineering III. INGEGRAF 2022. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-031-20325-1_45
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