Cartographie de l’accessibilité par les alternatives à la voiture

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

DSM from SPOT5-HRS images: extraction and validation

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

Chapitre 2: Contexte géologique et géomorphologique du chantier L (Tell Amarna, Syrie)

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

Intérêt de la fusion d’images à haute résolution spatiale pour la classification de l’occupation du sol en milieu urbain

in Revue Internationale de Géomatique (2004), 14(3-4), 417-439

Urban use of VHR images on Bukavu (Democratic Republic of Congo)

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 ▲]

The 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

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

The 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

in Proceedings of the CIPA WG6 international workshop on Scanning for Cultural Heritage Recording (2002)

RS Data Fusion by Local Mean and Variance Matching Algorithms: their Respective Efficiency in a Complex Urban Context

(2001)

Neotectonic implications of a lineament-coplanarity analysis in Southern Calabria, Italy

in Special Publication - Geological Society of London (1998), 146

Interférométrie RSO et analyses géomorphométriques à caractère tectonique en Jordanie.

in Dubois, J. M.; Bernier, M.; Fortin, J. P. (Eds.) et al Série Actualité scientifique - La réalité de terrain en télédétection: pratiques et méthodes (1998)