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Flood mapping from radar remote sensing using automated image classification techniques / Lisa Landuyt (2021)  

Public Titre : Flood mapping from radar remote sensing using automated image classification techniques Type de document : Thèse/HDR Auteurs : Lisa Landuyt, Auteur ; Niko Verhoest, Directeur de thèse ; Frieke Vancoillie, Directeur de thèse Editeur : Gand [Belgique] : Universiteit Gent Année de publication : 2021 Importance : 227 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-94-6357-415-0 Note générale : bibliographie Dissertation submitted in fulfillment of the requirements for the degree of Doctor (PhD) of Bioscience Engineering Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse d'image orientée objet [Termes IGN] bande C [Termes IGN] cartographie des risques [Termes IGN] détection de changement [Termes IGN] extraction de la végétation [Termes IGN] Flandre (Belgique) [Termes IGN] gestion de l'eau [Termes IGN] image radar moirée [Termes IGN] image Sentinel-SAR [Termes IGN] inondation [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] modèle de simulation [Termes IGN] surveillance hydrologique Résumé : (auteur) Floods are a hazard of major concern, causing substantial fatalities and eco-nomic losses. These losses are expected to further accumulate in the future, as both the frequency and magnitude of flood events are projected to increase dueto climate change. Insights into the occurrence and dynamics of these disastrous events are thus of paramount importance for the protection of livelihoods across the world, both in the near and far future.Synthetic Aperture Radar (SAR) satellite imagery is particularly suited to observe floods due to the synoptic view, low cost and timely availability ofsatellite imagery and the all-weather imaging capabilities of SAR sensors. The resulting observations are crucial for various purposes, including emergency relief, post-disaster damage assessment, the calibration and validation of floodprediction models, and risk assessment.Despite the clear advantages of SAR imagery, several factors complicate the flood extent retrieval from this imagery type. These include surfaces or land dynamics characterized by a SAR backscatter similar to that of water/flooding,as well as the presence of urban features and vegetation. Moreover, existing approaches often lack the robustness and automation necessary for operational purposes. This thesis aims to contribute to the accuracy and automation of SAR-based flood mapping approaches, by elaborating on several of theremaining challenges. More specifically, the objectives of this thesis are: 1.to investigate the state of the art in SAR-based flood mapping andidentify the strengths and limitations of existing methods, as well as possible trends; 2.to assess the potential of C-band SAR for the delineation of floodedvegetation, and suggested an approach for doing so in an automated way; 3.to identify the main obstacles with respect to automated flood monitoring,and develop an approach that allows putting science into practice. In the process of pursuing these objectives, special attention is given to automation, as this is key for objective and timely observations, and to optimally employing available data, as additional data can substantially improve flood observations but not handling these critically may be have adverse effects. Additionally, the potential of object-based image analysis (OBIA) techniques is investigated, as they have proven their added value using optical imagery but SAR-based applications remain limited. Sentinel-1imagery is the main datasource considered in this thesis, as this medium-resolution C-band imagery is freely available and provides consistent global coverage.First, the state of the art in SAR-based flood mapping is investigated. Distin-guishing between approaches for the retrieval of open water, flooded vegetationand urban flooding, deployed input data and classification techniques are discussed. As it is difficult to draw conclusions regarding the strengths and limitations of these classification techniques based on their scientific publications, an in-depth assessment and comparison of a selection of these is carried out. This selection includes thresholding, active contour modeling and theHSBA-Flood method, and both single scene and change detection-based maps are generated. To tackle the second objective of this thesis, the detectability of both woody and herbaceous vegetation using Sentinel-1 is investigated. Moreover, an automated, object-based clustering approach, making use of globally and freely available data only, is presented and applied on four study areas with varying characteristics. The resulting flood maps discriminate between dryland, permanent water, open flooding and flooded vegetation. Forests are indicated too, in order to underline the uncertainty related to these areas where flooding cannot or only to a limited extent be detected.In the last part of this thesis, an approach for operational flood monitoringin Flanders is presented. This approach was developed for and with input of the local water manager,i.e.the Flanders Environment Agency, and makesuse of high-resolution ancillary data available for the region of interest. By combining a pixel-based and an object-based approach, a discrimination is made between dry land, permanent water, open flooding, probable flooding, flooded vegetation and probably flooded forests. The approach is extensively tested on flood events of different sizes that occurred between 2016 and 2020. Both the detectability of these flood events and the accuracy of the developed algorithm, in the presence and absence of flooding, are assessed and discussed. Note de contenu : 1- Introduction 2- Synthetic aperture radar: theoretical background 3- State of the art in SAR-based flood mapping 4- An assessment of establish ed SAR-based flood mappingapproaches 5- Flood mapping in vegetated areas using an unsupervisedclustering approach on Sentinel-1 and -2 imagery 6- Flood monitoring in Flanders using Sentinel-1 imagery 7- Conclusion and outlook Numéro de notice : 28303 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Note de thèse : PhD Thesis : Bioscience Engineering : Universiteit Gent : 2021 DOI : sans En ligne : https://biblio.ugent.be/publication/8709595/file/8709639.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98053

The ecosystem service assessment challenge: Reflections from Flanders-REA / Sander Jacobs in Ecological indicators, vol 61 (February 2016)  

Public [article]  inEcological indicators > vol 61 (February 2016) . - pp 715 - 727 Titre : The ecosystem service assessment challenge: Reflections from Flanders-REA Type de document : Article/Communication Auteurs : Sander Jacobs, Auteur ; Toon Spanhove, Auteur ; Lieven de Smet, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 715 - 727 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Environnement [Termes IGN] Flandre (Belgique) [Termes IGN] protection de la biodiversité [Termes IGN] service écosystémique Résumé : (auteur) This paper aims to improve ecosystem assessment practice by sharing the lessons learned from the Flanders Regional Ecosystem Assessment. The ‘EU biodiversity strategy to 2020’, requests the EU member states ‘to map and assess the state of ecosystems and their services by 2014’. However, a large number of member states have yet to start this assessment, and depend on assistance from the European Commission and on experiences from ongoing national assessments. In the region of Flanders (Belgium), several ecosystem service projects have since 2009 led the way to the ‘Flanders Regional Ecosystem Assessment’ (Flanders-REA), led by the governments’ leading research institute on biodiversity. To attain high regional requirements on scientific quality, acceptance and effective local policy impact, this assessment has tackled a number of challenges. The challenges discussed in this paper are obtaining conceptual clarity and consensus across disciplines and partners, the integration of multiple sources of information, critical handling of maps and the inclusion of experts and stakeholders. This paper also critically reflects on the definition of EU targets, their implementation, the current EU assistance to the member states, and the alignment with actual local and global policy needs. Numéro de notice : A2016-345 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.ecolind.2015.10.023 En ligne : http://dx.doi.org/10.1016/j.ecolind.2015.10.023 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81030 [article]

Terrestrial laser scanning as a key element in the integrated monitoring of tidal influences on a twin-tube concrete tunnel / Timothy Nuttens in Photogrammetric record, vol 29 n° 148 (December 2014 - February 2015)  

Public [article]  inPhotogrammetric record > vol 29 n° 148 (December 2014 - February 2015) . - pp 402–416 Titre : Terrestrial laser scanning as a key element in the integrated monitoring of tidal influences on a twin-tube concrete tunnel Type de document : Article/Communication Auteurs : Timothy Nuttens, Auteur ; Cornelis Stal, Auteur ; Hans de Backer, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 402–416 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] Anvers (Flandre) [Termes IGN] marée océanique [Termes IGN] surveillance d'ouvrage [Termes IGN] télémétrie laser terrestre [Termes IGN] tunnel Résumé : (Auteur) In 2012, for the first time in Belgium, integrated monitoring was carried out to assess the deformations of a twin-tube tunnel below the River Scheldt in Antwerp under the influence of estuarine tides. Levelling measurements during a tide cycle showed a variation in the height of levelling bolts of up to 10 mm between low and high tide. Simultaneous strain-gauge measurements also showed a significant difference in strains. A deformation of the tunnel section during each twice-daily tide cycle, resulting in an eccentric “egg” or “pumpkin” shape, could hold large risks for the strength and durability of the tunnel structure. However, laser scanning results showed that there were no significant deformations of the tunnel's shape during the tide cycle. The laser scanning measurements resulted in a more thorough view of the deformation pattern which was much needed and improved the long-term risk assessment of the tunnel. Numéro de notice : A2014-647 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12080 Date de publication en ligne : 16/12/2014 En ligne : https://doi.org/10.1111/phor.12080 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75093 [article]

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Belgique, les cartes de la discorde / Cécile Marin in Carto, le monde en cartes, n° 13 (septembre - octobre 2012)

Public [article]  inCarto, le monde en cartes > n° 13 (septembre - octobre 2012) . - pp 54 - 55 Titre : Belgique, les cartes de la discorde Type de document : Article/Communication Auteurs : Cécile Marin, Auteur Année de publication : 2012 Article en page(s) : pp 54 - 55 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Cartographie thématique [Termes IGN] Belgique [Termes IGN] carte transfrontalière [Termes IGN] flamand (langue) [Termes IGN] Flandre (Belgique) [Termes IGN] frontière [Termes IGN] Wallonie (Belgique) Résumé : (Auteur) Ce plat petit pays dans lequel les langues vernaculaires se sont effacées au profit des idiomes de ses trois grands voisins n'en finit pas de se chercher une unité dans sa diversité. Le contexte politique délicat qui est le sien depuis deux ans exacerbe les rivalités. Flamands et wallons s'observent par-dessus la frontière et les représentations du territoire sont particulièrement scrutées. Les erreurs cartographiques des uns ou des autres ne manquent pas d'alimenter des polémiques. Numéro de notice : A2012-456 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31902 [article]

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Multiple endmember unmixing of CHRIS/Proba imagery for mapping impervious surfaces in urban and suburban environments / Luca Demarchi in IEEE Transactions on geoscience and remote sensing, vol 50 n° 9 (October 2012)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 50 n° 9 (October 2012) . - pp 3409 - 3424 Titre : Multiple endmember unmixing of CHRIS/Proba imagery for mapping impervious surfaces in urban and suburban environments Type de document : Article/Communication Auteurs : Luca Demarchi, Auteur ; Frank Canters, Auteur ; Jonathan Cheung-Wai Chan, Auteur ; T. Van De Voorde, Auteur Année de publication : 2012 Article en page(s) : pp 3409 - 3424 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse de mélange spectral d’extrémités multiples [Termes IGN] Flandre (Belgique) [Termes IGN] image PROBA-CHRIS [Termes IGN] occupation du sol [Termes IGN] précision infrapixellaire [Termes IGN] surface imperméable [Termes IGN] zone urbaine Résumé : (Auteur) In this paper, the potential of Compact High-Resolution Imaging Spectrometer (CHRIS)/Project for On-Board Autonomy data for impervious surface mapping is tested in a mixed urban/suburban/rural environment including part of the city of Leuven (Belgium) using multiple endmember unmixing. Various unmixing scenarios are compared, using different threshold values for the RMSE criterion applied to select the proper model for unmixing each pixel. Validation based on 25-cm aerial photography shows that the use of threshold values that favor the application of models with a small number of endmembers performs better compared to scenarios that make use of models with more endmembers. Detailed analysis of model selection for pixels with different land-cover composition indicates that the error in fraction estimation is partly related to spectral confusion between impervious surface types and bare soil, leading to the selection of inappropriate models for the unmixing. In spite of the spectral similarity of soil and impervious surface endmembers, average fractional error for impervious surfaces, vegetation, and bare soil is around 15%, which demonstrates the potential of CHRIS data for mapping the major physical components of the urban/suburban environment at the subpixel scale. Numéro de notice : A2012-449 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2011.2181853 Date de publication en ligne : 15/03/2012 En ligne : https://doi.org/10.1109/TGRS.2011.2181853 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31895 [article]

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Flood mapping system for Flanders / Siggis in GEO: Geoconnexion international, vol 10 n° 4 (april 2011)

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Assessing Spatial Data Infrastructure policy strategies using the multi-actor multi-criteria analysis / T. Geudens in International Journal of Spatial Data Infrastructures Research, vol 4 (Year 2009)    

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Feature selection by genetic algorithms in object-based classification of Ikonos imagery for forest mapping in Flanders, Belgium / F.M.B. Van Coillie in Remote sensing of environment, vol 110 n° 4 (30/10/2007)  

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Maritime GIS-applications entering the offshore world: accurate information vital in case of large vessels / R. Wevers in Geoinformatics, vol 8 n° 8 (01/12/2005)

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RUSLE [revised universal soil loss equation] applied in a GIS framework: calculating the LS factor and deriving homogenous patches for estimating soil loss / L.A. Lewis in International journal of geographical information science IJGIS, vol 19 n° 7 (august 2005)  

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Geographical city information via internet: development and experience with the city internet map server toolkit / M. Bonazountas in GIM international, vol 15 n° 2 (February 2001)

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Assessing the value of monotemporal Spot-1 imagery for forestry applications under Flemish conditions / F.C. Borry in Photogrammetric Engineering & Remote Sensing, PERS, vol 56 n° 8 (august 1990)  

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Château de Morbecque / J. Messiant (1990)

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Région du Nord / C. Delatre (1973)

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Classification des types de paysages, appliquée aux paysages de la Flandre / F. Snacken in Bulletin [Société Française de Photogrammétrie], n° 26 (Avril 1967)

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