Distributed GIS for sharing large scale data between public agencies. A case study in Belgium

in GIS 2002 International Conference Proceedings (2002)

A Methodology for Updating Large Scale Ortho-Photomaps by Means of VHR Satellite imagery

in Maktav, Derya; Jürgens, Carsten; Erber Sunar, Filiz (Eds.) et al Proceedings of the 3d International Symposium of Remote Sensing of Urban Areas (2002)

Some authorities (DGPL) of the Walloon Region (Belgium) are involved in the realization of a complete regional coverage (16,844 km²) of natural colour ortho-photomap to be used at large scales (up to 1 ... [more ▼]

Some authorities (DGPL) of the Walloon Region (Belgium) are involved in the realization of a complete regional coverage (16,844 km²) of natural colour ortho-photomap to be used at large scales (up to 1:4000). These are made of very high-resolution digital ortho-rectified aerial photos presented as raster files. Those rasters are grouped by corresponding administrative boundaries and distributed to the local authorities in order to be used for various land and urban planning purposes. One goal of the DGPL is to provide the local administrations with up to date image data, within the limits of some obvious financial constraints. Because significant changes in the landscape appear at different rates over the time and space, it was suggested to devise a methodology to find out these changes would require a rapid update of the imagery. In regard to this situation, a pilot project has been set up in the year 2000 aiming at detecting the location, the extent and the nature of landscape changes in contrasted areas - urban, suburban, rural - from adequately processed very high resolution (VHR) satellite images - typically Ikonos multi-spectral (4m) and panchromatic (1m) images. Hence, this project had to cope with various issues related to multi-source analysis, geometric and radiometric aspects of the processing VHR data, diachronic analysis, in order to provide the administration with the basic knowledge and the appropriate tools to carry out the proposed task. This communication presents the proposed operational methodology for change detection including all processing steps from the digital image processing (image fusion technique, ortho-rectification analysis, change detection schemes). Along the way it also introduces an assessment of the possible complementarities and convergence of VHR satellite imagery and aerial photography. [less ▲]

Progress in the Use of Vhr Satellite Imagery and Applications in Urban Remote Sensing

in Space scientific research in Belgium (2001)

This paper presents various works completed by the laboratory SURFACES - Department of Geomatics, University of Liege - between 1994 and 2000 in the framework of the TELSAT programme. Not less than 22 ... [more ▼]

This paper presents various works completed by the laboratory SURFACES - Department of Geomatics, University of Liege - between 1994 and 2000 in the framework of the TELSAT programme. Not less than 22 studies have been achieved during this period, which mainly deal with the use of very high resolution (VHR) satellite imagery and urban remote sensing. Owing to the experience accumulated about these topics by the laboratory for the beginning of the TELSAT programme - in the mid of the '80s - the works here under consideration are mainly devoted to applied studies. However fundamental research is not withdrawn. The expectation — and recently the availability — of new sensors was the opportunity for simulating, developing and improving methods, notably in the domains of the fusion of images and satellite photogrammetry. Finally it is worth noting that, as far as our laboratory is concerned, the considered period is also characterized by a wide diffusion of the results of our researches in fundamental and applied remote sensing. Several books and many papers have been published while an international symposium was held in Liege dedicated to urban remote sensing. On the other hand, satellite maps. CD and Web sites have been largely distributed for vulgarisation purposes. [less ▲]

Remote Sensing and Urban Analysis

Book published by Taylor & Francis (2001)

One of the key geographical developments over the last two centuries has been that of urbanisation. In recent years this has exploded globally, particularly in developing countries. It is essential for ... [more ▼]

One of the key geographical developments over the last two centuries has been that of urbanisation. In recent years this has exploded globally, particularly in developing countries. It is essential for governments, planners and researchers in geography and allied fields to understand this process and the main way of being able to do this is to accurately map these changes. The main method of this mapping is Remote Sensing.This up-to-date analysis of the area looks at a wide range of methodologies currently being used to produce and analyse remotely sensed data of urban areas. The authors examine the various techniques used to extract information from digital, multispectral images of urban areas. Donnay and Barnsley then go on to look at the identification of urban forms, the delineation of agglomerations and the development of urban morphology, considering the analysis of integrated data sets and surface models and going on to look at the estimation of human population levels. [less ▲]

Remote Sensing and Urban Analysis : A Research Agenda

in Donnay, Jean-Paul; Barnsley, Mike; Longley, Paul (Eds.) Remote Sensing and Urban Analysis (2001)

Distribution of the foraging activity of females Antarctic fur seal (Actocephalus Gazella)

in Oceanographic factors and prey distribution at Kerguelen island : a two-year comparison (2000)

La télédétection urbaine à l’aube de la très haute résolution

in La télédétection en francophonie : analyse critique et perspectives (2000)

La spatio-cartographie

in Bulletin de la Société Géographique de Liège (2000), 38(1),

Nature et qualités de spatiocartes

in Bulletin de la Société Géographique de Liège (2000), 38

De verdeelde of gedistribueerde informatie systemen – Les systèmes d’information géographique répartis ou distribués.

in Landmeter - Géomètre (2000), 311(42), 9-14