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Multitemporal analysis of gully erosion in olive groves by means of digital elevation models obtained with aerial photogrammetric and LIDAR data / Tomás Fernández in ISPRS International journal of geo-information, vol 9 n° 4 (April 2020)  

Public [article]  inISPRS International journal of geo-information > vol 9 n° 4 (April 2020) . - 30 p. Titre : Multitemporal analysis of gully erosion in olive groves by means of digital elevation models obtained with aerial photogrammetric and LIDAR data Type de document : Article/Communication Auteurs : Tomás Fernández, Auteur ; José Luis Pérez-García, Auteur ; José Miguel Gómez-López, Auteur ; et al., Auteur Année de publication : 2020 Article en page(s) : 30 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] analyse diachronique [Termes IGN] Andalousie [Termes IGN] données lidar [Termes IGN] données publiques [Termes IGN] érosion [Termes IGN] image aérienne [Termes IGN] image captée par drone [Termes IGN] modèle numérique de surface [Termes IGN] modèle numérique de terrain [Termes IGN] Olea europaea [Termes IGN] orthophotographie [Termes IGN] point d'appui [Termes IGN] précipitation [Termes IGN] ravin [Termes IGN] semis de points Résumé : (auteur) Gully erosion is one of the main processes of soil degradation, representing 50%–90% of total erosion at basin scales. Thus, its precise characterization has received growing attention in recent years. Geomatics techniques, mainly photogrammetry and LiDAR, can support the quantitative analysis of gully development. This paper deals with the application of these techniques using aerial photographs and airborne LiDAR data available from public database servers to identify and quantify gully erosion through a long period (1980–2016) in an area of 7.5 km2 in olive groves. Several historical flights (1980, 1996, 2001, 2005, 2009, 2011, 2013 and 2016) were aligned in a common coordinate reference system with the LiDAR point cloud, and then, digital surface models (DSMs) and orthophotographs were obtained. Next, the analysis of the DSM of differences (DoDs) allowed the identification of gullies, the calculation of the affected areas as well as the estimation of height differences and volumes between models. These analyses result in an average depletion of 0.50 m and volume loss of 85000 m3 in the gully area, with some periods (2009–2011 and 2011–2013) showing rates of 10,000–20,000 m3/year (20–40 t/ha*year). The manual edition of DSMs in order to obtain digital elevation models (DTMs) in a detailed sector has facilitated an analysis of the influence of this operation on the erosion calculations, finding that it is not significant except in gully areas with a very steep shape. Numéro de notice : A2020-266 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi9040260 Date de publication en ligne : 19/04/2020 En ligne : https://doi.org/10.3390/ijgi9040260 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95029 [article]

Using kites for 3-D mapping of gullies at decimetre-resolution over several square kilometres: a case study on the Kamech catchment, Tunisia / Denis Feurer in Natural Hazards and Earth System Sciences, vol 18 n° 6 ([01/06/2018])    

Public [article]  inNatural Hazards and Earth System Sciences > vol 18 n° 6 [01/06/2018] . - pp 1567 - 1582 Titre : Using kites for 3-D mapping of gullies at decimetre-resolution over several square kilometres: a case study on the Kamech catchment, Tunisia Type de document : Article/Communication Auteurs : Denis Feurer, Auteur ; Olivier Planchon, Auteur ; Mohamed A. El Maaoui, Auteur ; Abir Ben Slimane, Auteur ; Mohamed-Rached Boussema, Auteur ; Marc Pierrot-Deseilligny , Auteur ; Damien Raclot, Auteur Année de publication : 2018 Projets : TOSCA A-MUSE / Article en page(s) : pp 1567 - 1582 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] cerf-volant [Termes IGN] données localisées 3D [Termes IGN] érosion hydrique [Termes IGN] modèle numérique de surface [Termes IGN] prise de vue aérienne [Termes IGN] ravin [Termes IGN] Tunisie Résumé : (auteur) 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. Numéro de notice : A2018-589 Affiliation des auteurs : LASTIG LOEMI+Ext (2012-2019) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5194/nhess-18-1567-2018 Date de publication en ligne : 07/06/2018 En ligne : http://dx.doi.org/10.5194/nhess-18-1567-2018 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93815 [article]

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Contribution à l’étude phytosociologique des forêts de ravins des Pyrénées : Validation de quelques syntaxons nouveaux / Gilles Corriol in Revue forestière française, vol 62 n° 3-4 (mai - août 2010)  

Public [article]  inRevue forestière française > vol 62 n° 3-4 (mai - août 2010) . - pp 229 - 236 Titre : Contribution à l’étude phytosociologique des forêts de ravins des Pyrénées : Validation de quelques syntaxons nouveaux Type de document : Article/Communication Auteurs : Gilles Corriol, Auteur ; Matthieu Chaney, Auteur Année de publication : 2010 Article en page(s) : pp 229 - 236 Note générale : biblographie, tableaux phytosciologiques Langues : Français (fre) Descripteur : [Termes IGN] Acer monspessulanum [Termes IGN] forêt thermophile [Termes IGN] phytosociologie [Termes IGN] plante xérophile [Termes IGN] Pyrénées (montagne) [Termes IGN] Quercus ilex [Termes IGN] ravin [Termes IGN] sorbus aria [Termes IGN] Tilia cordata [Termes IGN] Tilia platyphyllos [Termes IGN] unité phytosociologique [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Une étude phytosociologique des forêt de ravins sur l’ensemble du versant français des Pyrénées a été entreprise par le Conservatoire botanique national des Pyrénées et de Midi-Pyrénées. Lors du colloque de phytosociologie en hommage à Jean-Claude Rameau, une partie de cette étude a été présentée sur la base d’une centaine de relevés correspondant aux types thermophiles et xérophiles. Quatre associations végétales et trois sous-associations sont identifiées, toutes rattachées à l’alliance du Tilion platyphylli Moor 1973. Parmi elles, trois associations nouvelles sont validées : le Querco ilicis-Tilietum platyphylli, l’Aceri monspessulani - Tilietum cordatae et le Sorbo ariae - Tilietum platyphylli, ainsi que trois sous-associations nouvelles. Numéro de notice : A2010-609 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.4267/2042/38937 En ligne : https://doi.org/10.4267/2042/38937 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82662 [article]

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