1. Using kites for 3-D mapping of gullies at decimetre-resolution over several square kilometres: a case study on the Kamech catchment, Tunisia
- Author
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Feurer, Denis, Planchon, Olivier, El Maaoui, Mohamed Amine, Slimane, Abir, Boussema, Mohamed, Pierrot-Deseilligny, Marc, Raclot, Damien, Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème (UMR LISAH), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), ltsirs, Université de la Manouba [Tunisie] (UMA), Ecole Nationale d'Ingénieurs de Tunis (ENIT), Université de Tunis El Manar (UTM), Institut National de Recherche en Génie Rural Eaux et Forêts (INRGREF), Ecole Nationale du Génie Rural, des Eaux et des Forêts (ENGREF)-Institution de la Recherche et de l'Enseignement Supérieur Agricoles [Tunis] (IRESA), Méthodes d'Analyses pour le Traitement d'Images et la Stéréorestitution (MATIS), Laboratoire des Sciences et Technologies de l'Information Géographique (LaSTIG), École nationale des sciences géographiques (ENSG), Institut National de l'Information Géographique et Forestière [IGN] (IGN)-Institut National de l'Information Géographique et Forestière [IGN] (IGN)-École nationale des sciences géographiques (ENSG), Institut National de l'Information Géographique et Forestière [IGN] (IGN)-Institut National de l'Information Géographique et Forestière [IGN] (IGN), Institut National de l'Information Géographique et Forestière [IGN] (IGN), French institute INRA, French institute IRD, TOSCA-CNES project 'A-MUSE, Analyse MUlti-temporelle de donnees SENTINEL 2 et 1 pour le monitoring de caracteristiques observables de la surface du sol, en lien avec l'infiltrabilite', Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème ( UMR LISAH ), Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Institut de Recherche pour le Développement ( IRD ) -Institut de Recherche pour le Développement ( IRD [ Madagascar] ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), Université de la Manouba [Tunisie], Ecole Nationale d'Ingénieurs de Tunis ( ENIT ), Institut National de Recherche en Génie Rural Eaux et Forêts ( INRGREF ), Ecole Nationale du Génie Rural, des Eaux et des Forêts ( ENGREF ), Méthodes d'Analyses pour le Traitement d'Images et la Stéréorestitution ( MATIS ), Institut National de l'Information Géographique et Forestière [IGN] ( IGN ), École nationale des sciences géographiques ( ENSG ), Laboratoire d'étude des interactions entre sols, agrosystèmes et hydrosystèmes ( LISAH ), Institut National de la Recherche Agronomique ( INRA ), Institut de Recherche pour le Développement (IRD)-Institut de Recherche pour le Développement (IRD [ Madagascar])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro), Ecole Nationale du Génie Rural, des Eaux et des Forêts (ENGREF), Laboratoire d'étude des interactions entre sols, agrosystèmes et hydrosystèmes (LISAH), and Institut National de la Recherche Agronomique (INRA)
- Subjects
lcsh:GE1-350 ,[SDE.MCG]Environmental Sciences/Global Changes ,lcsh:QE1-996.5 ,lcsh:Geography. Anthropology. Recreation ,[INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV] ,[ SPI.SIGNAL ] Engineering Sciences [physics]/Signal and Image processing ,[ INFO.INFO-CV ] Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV] ,[SDE.ES]Environmental Sciences/Environmental and Society ,lcsh:TD1-1066 ,lcsh:Geology ,[ SDE.MCG ] Environmental Sciences/Global Changes ,lcsh:G ,[ SDU.ENVI ] Sciences of the Universe [physics]/Continental interfaces, environment ,lcsh:Environmental technology. Sanitary engineering ,[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology ,[ SDU.STU.HY ] Sciences of the Universe [physics]/Earth Sciences/Hydrology ,[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment ,[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing ,lcsh:Environmental sciences ,[ SDE.ES ] Environmental Sciences/Environmental and Society - Abstract
Monitoring agricultural areas threatened by soil erosion often requires decimetre topographic information over areas of several square kilometres. Airborne lidar and remotely piloted aircraft system (RPAS) imagery have the ability to provide repeated decimetre-resolution and -accuracy digital elevation models (DEMs) covering these extents, which is unrealistic with ground surveys. However, various factors hamper the dissemination of these technologies in a wide range of situations, including local regulations for RPAS and the cost for airborne laser systems and medium-format RPAS imagery. The goal of this study is to investigate the ability of low-tech kite aerial photography to obtain DEMs with decimetre resolution and accuracy that permit 3-D descriptions of active gullying in cultivated areas of several square kilometres. To this end, we developed and assessed a two-step workflow. First, we used both heuristic experimental approaches in field and numerical simulations to determine the conditions that make a photogrammetric flight possible and effective over several square kilometres with a kite and a consumer-grade camera. Second, we mapped and characterised the entire gully system of a test catchment in 3-D. We showed numerically and experimentally that using a thin and light line for the kite is key for a complete 3-D coverage over several square kilometres. We thus obtained a decimetre-resolution DEM covering 3.18 km2 with a mean error and standard deviation of the error of +7 and 22 cm respectively, hence achieving decimetre accuracy. With this data set, we showed that high-resolution topographic data permit both the detection and characterisation of an entire gully system with a high level of detail and an overall accuracy of 74 % compared to an independent field survey. Kite aerial photography with simple but appropriate equipment is hence an alternative tool that has been proven to be valuable for surveying gullies with sub-metric details in a square-kilometre-scale catchment. This case study suggests that access to high-resolution topographic data on these scales can be given to the community, which may help facilitate a better understanding of gullying processes within a broader spectrum of conditions.
- Published
- 2018
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