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Efficient measurement of large-scale decadal shoreline change with increased accuracy in tide-dominated coastal environments with Google Earth Engine / Yongjing Mao in ISPRS Journal of photogrammetry and remote sensing, Vol 181 (November 2021)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > Vol 181 (November 2021) . - pp 385 - 399 Titre : Efficient measurement of large-scale decadal shoreline change with increased accuracy in tide-dominated coastal environments with Google Earth Engine Type de document : Article/Communication Auteurs : Yongjing Mao, Auteur ; Daniel L. Harris, Auteur ; Zunyi Xie, Auteur ; et al., Auteur Année de publication : 2021 Article en page(s) : pp 385 - 399 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Australie [Termes IGN] carte thématique [Termes IGN] détection de changement [Termes IGN] érosion côtière [Termes IGN] estran [Termes IGN] Google Earth Engine [Termes IGN] image Landsat [Termes IGN] littoral [Termes IGN] marée lunaire [Termes IGN] surveillance du littoral [Termes IGN] trait de côte Résumé : (auteur) Most of the worlds’ population relies on the processes and ecosystems in the coastal zone. Understanding the long-term change of coastlines is critical for the effective management of these complex, and heavily utilised regions. There has been a recent increase of studies focused on large-scale shoreline change mapping. However, most current methods are optimized for extracting shorelines of wave-dominated sandy beaches, which are only 30% of the global coasts, resulting in uncertainty for other environments such as tidal flats and bedrock. Here, we propose a new shoreline change mapping workflow, using the Landsat archive and Google Earth Engine, which increases compute efficiency and is suitable for retrieving shoreline changes for various coastal landforms at high tide instead of mean sea level. By validating against regional and continental datasets in Australia, we found the approach here produced high mapping accuracy and showed particularly better performance at tide-dominated coasts, where tidal flats and intertidal bars and ridges are present, when compared to past approaches. This is an important step forward since tide-dominated and tide-modified coasts are widely distributed at tropical low latitudes. We also explored the global application of the proposed method and derived hotspots of shoreline erosion and accretion that agreed with multiple regional studies across the world. Most of these hotspots were related to river sediment discharge and human intervention on the coast, as expected. Although it requires further validation, the global application of our method demonstrates the significance of this approach in identifying potential threats to coastal zones, especially in complex tide-dominated environments, which can facilitate effective coastal management. Numéro de notice : A2021-774 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2021.09.021 Date de publication en ligne : 05/10/2021 En ligne : https://doi.org/10.1016/j.isprsjprs.2021.09.021 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98831 [article]

Using Sentinel-2 images to estimate topography, tidal-stage lags and exposure periods over large intertidal areas / José P. Granadeiro in Remote sensing, Vol 13 n° 2 (January-2 2021)  

Public [article]  inRemote sensing > Vol 13 n° 2 (January-2 2021) . - n° 320 Titre : Using Sentinel-2 images to estimate topography, tidal-stage lags and exposure periods over large intertidal areas Type de document : Article/Communication Auteurs : José P. Granadeiro, Auteur ; João Belo, Auteur ; Mohamed Henriques, Auteur ; et al., Auteur Année de publication : 2021 Article en page(s) : n° 320 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] bathymétrie [Termes IGN] carte bathymétrique [Termes IGN] écosystème [Termes IGN] estran [Termes IGN] Guinée-Bissao [Termes IGN] habitat (nature) [Termes IGN] image Sentinel-MSI [Termes IGN] modèle numérique de surface [Termes IGN] régression logistique [Termes IGN] topographie locale Résumé : (auteur) Intertidal areas provide key ecosystem services but are declining worldwide. Digital elevation models (DEMs) are important tools to monitor the evolution of such areas. In this study, we aim at (i) estimating the intertidal topography based on an established pixel-wise algorithm, from Sentinel-2 MultiSpectral Instrument scenes, (ii) implementing a set of procedures to improve the quality of such estimation, and (iii) estimating the exposure period of the intertidal area of the Bijagós Archipelago, Guinea-Bissau. We first propose a four-parameter logistic regression to estimate intertidal topography. Afterwards, we develop a novel method to estimate tide-stage lags in the area covered by a Sentinel-2 scene to correct for geographical bias in topographic estimation resulting from differences in water height within each image. Our method searches for the minimum differences in height estimates obtained from rising and ebbing tides separately, enabling the estimation of cotidal lines. Tidal-stage differences estimated closely matched those published by official authorities. We re-estimated pixel heights from which we produced a model of intertidal exposure period. We obtained a high correlation between predicted and in-situ measurements of exposure period. We highlight the importance of remote sensing to deliver large-scale intertidal DEM and tide-stage data, with relevance for coastal safety, ecology and biodiversity conservation. Numéro de notice : A2021-197 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/IMAGERIE Nature : Article DOI : 10.3390/rs13020320 Date de publication en ligne : 19/01/2021 En ligne : https://doi.org/10.3390/rs13020320 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97148 [article]

Dynamics of inundation events in the rivers-estuaries-ocean continuum in Bengal delta : synergy between hydrodynamic modelling and spaceborne remote sensing / Md Jamal Uddin Kahn (2021)  

Public Titre : Dynamics of inundation events in the rivers-estuaries-ocean continuum in Bengal delta : synergy between hydrodynamic modelling and spaceborne remote sensing Type de document : Thèse/HDR Auteurs : Md Jamal Uddin Kahn, Auteur ; Fabien Durand, Directeur de thèse ; Laurent Testut, Directeur de thèse Editeur : Toulouse : Université de Toulouse 3 Paul Sabatier Année de publication : 2021 Importance : 167 p. Format : 21 x 30 cm Note générale : Bibliographie Thèse présentée en vue de l’obtention du Doctorat en Océan, Atmosphère, Climat, de l’Université de Toulouse Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Bengale, golfe du [Termes IGN] cyclone [Termes IGN] delta [Termes IGN] estran [Termes IGN] gestion des risques [Termes IGN] hydrodynamique [Termes IGN] image Sentinel-MSI [Termes IGN] marée océanique [Termes IGN] modèle numérique de surface [Termes IGN] niveau moyen des mers [Termes IGN] risque naturel [Termes IGN] submersion marine Index. décimale : THESE Thèses et HDR Résumé : (Auteur) The Bengal delta is the largest in the world. It is formed by the confluence of three transboundary rivers - Ganges, Brahmaputra, and Meghna. Flooding induced by large seasonal continental discharge, strong tide, and frequent deadly storm surges, regularly strikes this densely populated (density > 1000 person/km2), low-lying coastal region ( Note de contenu : 1. Introduction and Motivation 1.1 Introduction 1.2 The river deltas 1.3 Inundation in the Bengal delta 1.4 Bengal delta continuum and knowledge gaps 1.5 Scientific questions and study approach 1.6 Organization of the thesis 2. Hydrodynamic Modeling: Data and Methods 2.1 Introduction 2.2 Bathymetry assembly 2.3 Observations 2.4 Modelling framework 2.5 Model forcings and boundary condition 2.6 Assessment of tide 3. Intertidal Topography: Synergy Between Remote Sensing and Tidal Mod?elling 3.1 Introduction 3.2 Shoreline detection with Sentinel-2 imagery 3.3 Vertical referencing with tidal model 3.4 Results 3.5 Discussion 3.6 Conclusion 4. Coastal Tide: From the Present to the Future 4.1 Introduction 4.2 Observed trend in tidal range: The example of Hiron Point 4.3 Tidal model in the Bay of Bengal 4.4 Projected changes in tidal range in the Bengal delta 4.5 Tidal range evolution along the estuaries 4.6 Discussion 4.7 Conclusions 5. Storm Surge Modeling: A Case Study of Recent Super Cyclone Amphan 5.1 Introduction 5.2 Storm surge and inundation processes in the Bay of Bengal 5.3 Atmospheric evolution of cyclone Amphan 5.4 Storm surge model and performance 5.5 Near real-time storm surge forecasting 5.6 Discussion 5.7 Conclusions 5.8 Appendix 6. Storm Surge Hazard: A Probabilistic-Deterministic Approach 6.1 Introduction 6.2 Storm surge model 6.3 Probabilistic-deterministic cyclone ensemble 6.4 Storm surge hazard 6.5 Discussion 6.6 Conclusions and perspective 7. Conclusions and Perspectives for Future Work 7.1 Conclusion 7.2 Overview 7.3 Summary of conclusions and impacts 7.4 Future Research Perspectives 7.5 Transferrable lessons and concluding remarks Numéro de notice : 26768 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse française Note de thèse : Thèse de Doctorat : Océan, Atmosphère, Climat : Toulouse : 2021 Organisme de stage : Laboratoire d'Etudes en Géophysique et Océanographie Spatiales LEGOS nature-HAL : Thèse DOI : sans Date de publication en ligne : 06/01/2022 En ligne : https://tel.archives-ouvertes.fr/tel-03514722/document Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99866

Intertidal topography mapping using the waterline method from Sentinel-1 & -2 images: The examples of Arcachon and Veys Bays in France / Edward Salameh in ISPRS Journal of photogrammetry and remote sensing, vol 163 (May 2020)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 163 (May 2020) . - pp 98 - 120 Titre : Intertidal topography mapping using the waterline method from Sentinel-1 & -2 images: The examples of Arcachon and Veys Bays in France Type de document : Article/Communication Auteurs : Edward Salameh, Auteur ; Frédéric Frappart, Auteur ; Imen Turki, Auteur ; Benoit Laignel, Auteur Année de publication : 2020 Article en page(s) : pp 98 - 120 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image mixte [Termes IGN] aménagement du littoral [Termes IGN] Arcachon (bassin d') [Termes IGN] carte topographique [Termes IGN] Cotentin [Termes IGN] estran [Termes IGN] France (administrative) [Termes IGN] hydrodynamique [Termes IGN] image Sentinel-MSI [Termes IGN] image Sentinel-SAR [Termes IGN] modèle numérique de surface [Termes IGN] niveau de l'eau [Termes IGN] sédiment [Termes IGN] télédétection spatiale [Termes IGN] trait de côte [Termes IGN] zone tampon Résumé : (auteur) Intertidal flats lying as a buffer zone between land and sea provide critical services including protection against storm surges and coastal flooding. These environments are characterized by a continuous redistribution of sediment and changes in topography. Sea level rise, anthropogenic pressures, and their related stressors have a considerable impact on these areas and are expected to put them under more stress; hence the increased need for frequent and updated topography maps. Comparing to traditional surveying approaches, spaceborne remote sensing is able to provide topography maps more frequently with a lower cost and a higher coverage. The latter is currently considered as an established tool for measuring intertidal topography. In this study, an improved approach of the waterline method was developed to derive intertidal Digital Elevation Models (DEMs). The changes include a faster, more efficient and quasi-automatic detection and post-processing of waterlines. The edge detection technique consists in combining a k-means based segmentation and an active contouring procedure. This method was designed to generate closed contours in order to enable an automatization of the post-processing of the extracted waterlines. The waterlines were extracted from Sentinel-1 and Sentinel-2 images for two bays located on the French Coast: the Arcachon lagoon and the Bay of Veys. DEMs were generated for the Arcachon Bay between 2015 and 2018, and for the Bay of Veys between 2016 and 2018 using satellite acquisitions made during summer (low storm activity period). The comparison of the generated DEMs with lidar observations showed an error of about 19–25 cm. This study also demonstrated that the waterline method applied to Sentinel images is suitable for monitoring the morpho-sedimentary evolution in intertidal areas. By comparing the DEMs generated between 2016 and 2018, the Arcachon Bay and the Bay of Veys experienced net volume losses of 1.12 × 106 m3 and 0.70 × 106 m3 respectively. The generated DEMs provide useful and needed information for several scientific applications (e.g., sediment balance, hydrodynamic modelling), but also for authorities and stakeholders for coastal management and implementation of ecosystem protection policies. Numéro de notice : A2020-138 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2020.03.003 Date de publication en ligne : 13/03/2020 En ligne : https://doi.org/10.1016/j.isprsjprs.2020.03.003 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94756 [article]

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Unmanned aerial vehicles (UAVs) for monitoring macroalgal biodiversity: comparison of RGB and multispectral imaging sensors for biodiversity assessments / Leigh Tait in Remote sensing, vol 11 n° 19 (October-1 2019)  

Public [article]  inRemote sensing > vol 11 n° 19 (October-1 2019) . - 18 p. Titre : Unmanned aerial vehicles (UAVs) for monitoring macroalgal biodiversity: comparison of RGB and multispectral imaging sensors for biodiversity assessments Type de document : Article/Communication Auteurs : Leigh Tait, Auteur ; Jochen Bind, Auteur ; Hannah Charan-Dixon, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : 18 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] algue [Termes IGN] biodiversité [Termes IGN] changement climatique [Termes IGN] estran [Termes IGN] habitat (nature) [Termes IGN] image captée par drone [Termes IGN] image multibande [Termes IGN] image RVB [Termes IGN] Kappa de Cohen [Termes IGN] Nouvelle-Zélande [Termes IGN] orthophotoplan numérique [Termes IGN] réflectance spectrale [Termes IGN] surveillance du littoral Résumé : (auteur) Developments in the capabilities and affordability of unmanned aerial vehicles (UAVs) have led to an explosion in their use for a range of ecological and agricultural remote sensing applications. However, the ubiquity of visible light cameras aboard readily available UAVs may be limiting the application of these devices for fine-scale, high taxonomic resolution monitoring. Here we compare the use of RGB and multispectral cameras deployed aboard UAVs for assessing intertidal and shallow subtidal marine macroalgae to a high taxonomic resolution. Our results show that the diverse spectral profiles of marine macroalgae naturally lend themselves to remote sensing and habitat classification. Furthermore, we show that biodiversity assessments, particularly in shallow subtidal habitats, are enhanced using six-band discrete wavelength multispectral sensors (81% accuracy, Cohen’s Kappa) compared to three-band broad channel RGB sensors (79% accuracy, Cohen’s Kappa) for 10 habitat classes. Combining broad band RGB signals and narrow band multispectral sensing further improved the accuracy of classification with a combined accuracy of 90% (Cohen’s Kappa). Despite notable improvements in accuracy with multispectral imaging, RGB sensors were highly capable of broad habitat classification and rivaled multispectral sensors for classifying intertidal habitats. High spatial scale monitoring of turbid exposed rocky reefs presents a unique set of challenges, but the limitations of more traditional methods can be overcome by targeting ideal conditions with UAVs. Numéro de notice : A2019-553 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/rs11192332 Date de publication en ligne : 08/10/2019 En ligne : https://doi.org/10.3390/rs11192332 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94206 [article]

Reconstruction of time-varying tidal flat topography using optical remote sensing imageries / Kuo-Hsin Tseng in ISPRS Journal of photogrammetry and remote sensing, vol 131 (September 2017)  

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Homogeneous geovisualization of coastal areas from heterogeneous spatio-temporal data / Antoine Masse (2015)  

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Variations saisonnière et annuelle de l'indice NDVI en relation avec les herbiers de zosteres (zostera noltii) par images satellites Spot : exemple du Bassin d'Arcachon (France) / J.M. Froidefond in Revue Française de Photogrammétrie et de Télédétection, n° 197 (Juin 2012)  

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Comparaison de deux méthodes de cartographie de la végétation du schorre de la baie du Mont Saint-Michel : photo-interprétation raisonnée et classification automatique par espèce / Clélia Bilodeau in Photo interprétation, vol 44 n° 3 - 4 (Décembre 2008)

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La limite Slikke/Schorre dans la baie du Mont Saint-Michel (Golfe Normand-Breton, Nord Ouest France) / H. Kaveh in Photo interprétation, vol 44 n° 3 - 4 (Décembre 2008)

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vol 63 n° 5 - September - October 2008 - Remote sensing of coastal ecosystems (Bulletin de ISPRS Journal of photogrammetry and remote sensing) / International society for photogrammetry and remote sensing (1980 -)  

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Cartes des côtes de France / Olivier Chapuis (2007)

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Litto3D réunifie la terre et la mer / M. Mayo in Géomètre, n° 2031 (novembre 2006)

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Mise à jour de MNT intégré terre - mer et application au prisme megatidal du Mont Saint-michel (France) / F. Kaveh in Revue Française de Photogrammétrie et de Télédétection, n° 177 (Juin 2005)

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Conception et réalisation d'un SIG dédié aux études environnementales sur le site d'étude de la baie du Mont-Saint-Michel / Nicolas David (2005)

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