References of "Cornet, Yves"
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See detailTracking landslide evolution over decades: application of aerial digital photogrammetry to the Oudenaarde area (W Belgium)
Dewitte, Olivier ULg; Jasselette, Jean-Claude; Cornet, Yves ULg et al

(2007)

In order to include some kinematic information within landslide hazard prediction models, we estimated landslide motion in the medium term (i.e. a few decades) by comparing precise landslide topography ... [more ▼]

In order to include some kinematic information within landslide hazard prediction models, we estimated landslide motion in the medium term (i.e. a few decades) by comparing precise landslide topography reconstructions at different dates. Precise multitemporal 3D data of the 13 old deep-seated landslides developed on two hills close to the town of Oudenaarde (W Belgium) were obtained by digital stereophotogrammetry using aerial photographs of three different periods (1996, 1973 and 1952). From these data, six DTMs (3 different dates for each investigated hill) were produced with an overall RMS error of ~50 cm. The obtained DTMs were subtracted from each other in order to determine the vertical displacement of each pixel during the considered time interval. Globally, movements are observed in all the landslides and they generally correspond to a rotational pattern. [less ▲]

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See detailStrategies to estimate ground susceptibility to landslide reactivation. A probabilistic application in W Belgium (Oudenaarde)
Dewitte, Olivier ULg; Chung, Chang-Jo; Cornet, Yves ULg et al

(2007)

In the hilly region of the Flemish Ardennes in western Belgium, no new big deep-seated landslides have occurred for decades, whereas several reactivation episodes were recently observed in ancient ... [more ▼]

In the hilly region of the Flemish Ardennes in western Belgium, no new big deep-seated landslides have occurred for decades, whereas several reactivation episodes were recently observed in ancient landslides. We selected a test area comprised of 13 rotational landslides located close to the town of Oudenaarde in order to predict the susceptibility of their main scarp to retreat. We propose here two probabilistic models based on a fuzzy set approach. The models use empirical distribution functions (EDFs) as favourability values to build membership values and combine them by using the fuzzy Gamma operator. Based on Kolmogorov-Smirnov tests applied to these EDFs to select the most relevant data, a first model was obtained bases on a combination of 5 quantitative variables: slope angle, distance from cultivation located upstream of the main scarp, slope aspect, elevation and profile curvature. Another, more empirical approach based on the a posteriori analysis of the prediction-rate curves was applied to select the 4 variables of a second model: slope aspect, plan curvature, vegetation index and focal flow. According to the prediction-rate curves and the resulting susceptibility maps, the empirical model appears more efficient in locating the main scarp areas most prone to reactivation. [less ▲]

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See detailControlling factors of gully erosion in the upper part of the Isser river watershed (Algiers, N. Algeria)
Daoudi, M.; Dewitte, Olivier ULg; Gérard, Paul et al

in Geophysical Research Abstracts (2007), 9

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See detailActivity patterns, home-range size, and habitat utilization of Sarpa salpa (Teleostei : Sparidae) in the Mediterranean Sea
Jadot, Catherine; Donnay, Annick ULg; Acolas, M.-L. et al

in Ices Journal of Marine Science (2006), 63(1), 128-139

Acoustic telemetry was used to record diel movement and habitat utilization of the salema (Sarpa salpa) (Teleostei: Sparidae) during three consecutive summers from 2000 to 2002 in the Calvi and Achiarina ... [more ▼]

Acoustic telemetry was used to record diel movement and habitat utilization of the salema (Sarpa salpa) (Teleostei: Sparidae) during three consecutive summers from 2000 to 2002 in the Calvi and Achiarina bays of Corsica in the Mediterranean Sea. A total of 18 fish was equipped with acoustic transmitters inserted in the body cavity, 13 were tracked in the Bay of Calvi (275 mm +/- 26.9 L-F), and 5 in Achiarina Bay (260 mm +/- 33.6 LF). Two different systems were used to track the fish. The one used in the Bay of Calvi was a manual receiver and a directional hydrophone. The second system, used in Achiarina Bay, was a radioacoustic-positioning (RAP) system that continuously monitored the movements of the fish. Fish positions were put in a geographic information system (GIS) with information on the substratum and depth. Two patterns of behaviour could be identified in the three years. Either the fish had clearly defined daytime as opposed to night-time areas of residency, characterized by different depths and substrata or the fish persistently occupied the same sites during both day and night. In the Bay of Calvi, six fish were released I km from the capture site. All of them showed homing ability and returned to the site within 48 h. [less ▲]

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See detailAnalysis of buildings height computed on a DSM generated from a VHR satellite stereopair
Binard, Marc ULg; Devriendt, D.; Cornet, Yves ULg et al

in Hostert, P.; Damm, A.; Schiefer, S. (Eds.) Proceedings of the First Workshop of the EARSeL Special Interest Group on Urban Remote Sensing "Challenges and Solutions" (2006)

At the final meeting of the SPIDER project, the users wanted to know if it was possible to evaluate the building height or the number of floors, from the DSM obtained from a VHR satellite stereopair ... [more ▼]

At the final meeting of the SPIDER project, the users wanted to know if it was possible to evaluate the building height or the number of floors, from the DSM obtained from a VHR satellite stereopair. Combined with the 2D delineation of the buildings – for example coming from the cadastre register - this information could be useful in urban studies – e.g. population density assessment - or to generate quasi realistic 3D views. In this example, the DSM is extracted from an IKONOS stereopair (DSMsat) on the hilly area of Liège in Belgium. It is used in combination with a 3D vector file. On the one hand, this file is used for the 2D delineation of the buildings. On the other hand, the third dimension provided by this file is also exploited for the assessment of the extracted building height. Moreover LIDAR data are also available over the test area, permitting the creation of a reference DSM (DSMref). * The first step of the process consists in the determination of the ground altitude around the buildings. A procedure was setup in order to compute it and to generate the DTM for the reference and satellite data (DTMref and DTMsat). * The second step consists in the extraction of statistics, for every building (min, max, mean, etc.) as well from the DSMsat and DSMref, as from the DTMsat and DTMref. The analysis shows that the satellite approach globally underestimates the building height of about 4 m. These results are discussed regarding building height versus the area and the heterogeneity of the roof height. [less ▲]

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See detailThe usefulness of VHR images for public administrations in an urban hilly region
Binard, Marc ULg; Cornet, Yves ULg; Donnay, Jean-Paul ULg

in Marçal, André (Ed.) "Global Developments in Environmental Earth Observation from Space" (2006)

This paper presents some results of the SPIDER project currently achieved in and around the city of Liège located in a hilly landscape. A Quick Bird image bundle product acquired on the 26th September ... [more ▼]

This paper presents some results of the SPIDER project currently achieved in and around the city of Liège located in a hilly landscape. A Quick Bird image bundle product acquired on the 26th September 2003 is used. Digital spatial data like Very High Resolution (VHR) satellite images could be provided to the public authorities of the Walloon region thanks to the Walloon cartographic gateway. In urban context and especially in hilly region, such images must be orthorectified using a Digital Surface Model (DSM). A 1 m resolution DSM was elaborated by exploiting all the 3D data available in the study area. Firstly, a TIN was generated from vector data (points, lines and polygons) selected, on the one hand, from the 1:50 000 (DTED-WGS) and the 1:10 000 (DTM- 10000, Top10v-GIS) cartographic database provided by the Belgian NGI and, on the other hand, from the 1:1 000 3D topographic database of the Walloon region (PICC). Then the TIN was rasterised and the DSM airborne LIDAR acquired along the main river-valleys is superimposed on the result. The ortho-image was then produced. The public authorities consider it as an end-product by itself which could be used in the place of the obsolete aerial orthophotos in the fast changing urban areas. Normally, the ortho-image of Liège should be available on the map server of the Walloon region in 2005, in order to check its usefulness for local and regional authorities. Moreover the local planning agency wish to take the opportunity of this study to update the spatial databases covering industrial and business development areas delineated on the urban plan. [less ▲]

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See detailCartographie de l’accessibilité par les alternatives à la voiture
Cornet, Yves ULg; Daxhelet, D.; Halleux, Jean-Marie ULg et al

Conference (2005, November 09)

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See detailCartographie de l’accessibilité par les alternatives à la voiture
Cornet, Yves ULg; Daxhelet, Delphine; Halleux, Jean-Marie ULg et al

in Witlox, F.; Van Acker, V. (Eds.) Les Journées Géographiques Belges. Mobilité, Société et Environnement en Cartes (2005)

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See detailModélisation de la distribution spatiale des précipitations en Sicile.
Cornet, Yves ULg; Fitschy, C.; Gobbato, O. et al

in Bulletin de la Société Géographique de Liège (2005), 46

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See detailDSM from SPOT5-HRS images: extraction and validation
Cornet, Yves ULg; Grevesse, J.; Binard, Marc ULg et al

in Jacobsen, K.; Goossens, Rudi; Winkler, P. (Eds.) Proceding of the EARSeL Workshop 3D-Remote Sensing: Porto, June 10 - 11, 2005 (2005)

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See detailAccuracy assessment of an IKONOS derived DSM over urban and suburban area
Devriendt, D.; Goossens, R.; Binard, Marc ULg et al

in Jacobsen, K.; Goossens, Rudi; Winkler, P. (Eds.) Proceding of the EARSeL Workshop 3D-Remote Sensing: Porto, June 10 - 11, 2005 (2005)

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See detailChapitre 2: Contexte géologique et géomorphologique du chantier L (Tell Amarna, Syrie)
Cornet, Yves ULg; Alvarez Perez, A.

in Molist, M.; Tunca, Önhan (Eds.) Tell Amarna (Syrie) I, la période de Halaf (2004)

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See detailWhich metrics to assess and compare the quality of image fusion products ?
Cornet, Yves ULg; Binard, Marc ULg

in New Strategies for European Remote Sensing (2004)

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See detailStratégies de fusion d’images P/XS basées sur les principes colorimétriques et l’Egalisation de Statistiques Locales
Cornet, Yves ULg; Schenke, Christophe ULg; De Bethune, S. et al

in Bulletin de la Société Française de Photogrammétrie et Télédétection (2003), 169

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See detailUrban use of VHR images on Bukavu (Democratic Republic of Congo)
Binard, Marc ULg; De Man, J.; Séba, G. et al

in Proceedings of the Second Workshop of the EARSeL Special Interest Group on Remote Sensing for Developing Countries, Bonn, Germany September 18-20, 2002. EARSeL: Paris, France. (2003)

The main purpose of this study was to show potential uses of very high resolution (VHR) image in an urban analysis of Bukavu in the Democratic Republic of Congo. As for many of the Third-World cities ... [more ▼]

The main purpose of this study was to show potential uses of very high resolution (VHR) image in an urban analysis of Bukavu in the Democratic Republic of Congo. As for many of the Third-World cities, Bukavu grew up during the last decades and available topographical information on Bukavu dates back to the middle of the twentieth century. This lack of updated information can be compensated by an appropriate use of VHR images. In this study, IKONOS image recorded on the 14th February 2001 was used. Image registration are highly dependant on accurate Digital Elevation Models (DEM), these last ones are also useful in urban analyses. The range between the minimum and maximum altitudes observed in the image was more than 500 meters. Furthermore, the viewing inclination angle is more than 28 degrees. In this case, orthorectification is mandatory for correcting relief displacements. Nevertheless, the lack of good Ground Control Points (GPS’s) on the old topographic maps and the failure to collect field verification data in Bukavu explains the remaining global 2D RMSE of 10 meters. For easier image interpretation, multispectral (4m) and panchromatic (1m) images were fused together by means of the LMVM algorithm. Depending on the object, the Computer Aided Photo Interpretation (CAPI) uses or does not use the near infrared information (true or false colour composite). For a more detailed interpretation about the city morphology we draped the 1m multispectral fused image over the 1m resolution DEM grid. The Built-up Area Index (BAI) computed on the urban mask obtained by CAPI and classification of the vegetation, was compared with the 1954 situation interpreted from topographic maps. The present city shows higher BAI values and in the same time the centre of the city has clearly shifted southward. Statistical analyses are also done on built-up versus slope data. The lack of good GCP’s and the use of DEM produced inaccurate orthorectification which was not adequate for topographical features extraction. Nevertheless the present extensions of Bukavu built-up areas are more than the double of those observed at the beginning of the last half century. New constructions are located on steeper slopes where landslides are frequents. More features could be extracted from the Ikonos image if good GPS measurements were made and if verification by the city authorities was possible. Some practical applications of this study could involve determining better location of new Bukavu extensions. [less ▲]

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See detailEtude complémentaire relative aux profils d'accessibilité - profils de mobilité
Daxhelet, Delphine; Kessler, Laurent; Lambotte, Jean-Marc ULg et al

Report (2002)

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See detailThe OSIRIS Project (Optical Systems for Interferometric-Photogrammetric Relief Investigation and Scanning). Development of a device for 3D numerical recording of archaeological and epigraphic documents by optoelectronic processes
Laboury, Dimitri ULg; Renotte, Yvon ULg; Tilkens, Bernard et al

in Boehler, Wolfgang (Ed.) PROCEEDINGS OF THE CIPA WG 6 INTERNATIONAL WORKSHOP ON SCANNING FOR CULTURAL HERITAGE RECORDING (2002, September)

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See detailEtude diachronique de 1948 à 1990 de l’évolution du littoral des plages de Nonza et d’Albo (Cap Corse) par traitement analigique de photographies aériennes
Gobert, O.; Ozer, André ULg; Cornet, Yves ULg

in Fierro, G. (Ed.) MED PICTURE, Mediterranean Project for the Improvement of Cooperation in Training between Universities, Regions and Enterprises. Programma Leonardo da Vinci (2002)

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