Publications of Jean-Paul Donnay
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See detailSystèmes géodésiques et projections "Lambert belge"
Donnay, Jean-Paul ULiege

Learning material (2012)

Cartographic and geodetic coordinate systems. Local and spatial datums. Successive versions of the Lambert conic conform (LCC) projection used in Belgium

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See detailThe professor falls for MG
Thorburn, Gordon; Donnay, Jean-Paul ULiege

in Thorburn, Gordon (Ed.) Me and My MG. Stories of MG owners around the world (2011)

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See detailDetermining the Geographical Origin of a Serial Offender Considering the Temporal Uncertainty of the Recorded Crime Data
Trotta, Marie ULiege; Bidaine, Benoît ULiege; Donnay, Jean-Paul ULiege

in GEOProcessing 2011 : The Third International Conference on Advanced Geographic Information Systems, Applications, and Services (2011, February)

Since the days the investigating officers used ”pin maps” to locate and to think about crime events, crime mapping has become widespread thanks to spatial analysis mainly supplied by GIS-like software. In ... [more ▼]

Since the days the investigating officers used ”pin maps” to locate and to think about crime events, crime mapping has become widespread thanks to spatial analysis mainly supplied by GIS-like software. In particular these methods suit well to geographic profiling devoted to crime series characterised by a single offender and hence limited space and time variability. Although spatial techniques are now regularly performed to delineate an offender’s area of residence, the temporal dimension is underemployed due to the wider uncertainty of time records. This paper proposes a methodology based on a least-squares adjustment in order to cope with this temporal issue for determining the most probable offender’s residence. Moreover, a chi-square test is described to check the significance of the solutions suggested by the method. The process is carried out on the real road network which has been discretised (rasterised) for computing convenience. Three simulations show the validity of the reasoning. Finally the main time and speed assumptions introduced in the model are discussed paving the way for further research. [less ▲]

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See detailReconstitution of the journeys to crime and location of their origin in the context of a crime series. A solution for a real case study.
Trotta, Marie ULiege; Kasprzyk, Jean-Paul ULiege; Donnay, Jean-Paul ULiege

Conference (2010, April 15)

Dynamic studies in crime analysis usually use distance-decay models applied on isotropic surfaces. If the distance actually traveled within the context of a crime series can be estimated, another approach ... [more ▼]

Dynamic studies in crime analysis usually use distance-decay models applied on isotropic surfaces. If the distance actually traveled within the context of a crime series can be estimated, another approach, independent of the widely discussed form of the distance decay, can be suggested. Besides, there is a need for studies on anisotropic space, especially in European cities, given their complex road network. Therefore, this study takes this aspect into account. We use data of a real case provided by the Belgian Police Department. Five criminal events have been committed in a short period of time by individuals using the same stolen car before abandoning it. The milometer allowed the Police to estimate the mileage covered by the criminals. The purpose of the analysis is to map out all the possible journeys to crime in order to find the offender's hideout. First, we generate cost surfaces propagated from the locations of the criminal events over the dense road network in a high-resolution raster file. This provides a distance value for all pixels of the potential paths to each crime. Then these distances are cumulated for all criminal events and the sum is confronted to the recorded mileage. This gives a restricted list of road sections from which all event locations can be reached under the constraint of the mileage covered. These results are then refined through a multi-criteria analysis using exogenous data, such as land covers. The small area finally identified contains indeed the hideout as confirmed by the Police Department. [less ▲]

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See detailPresentation of the Unit of Geomatics of the University of Liege
Donnay, Jean-Paul ULiege

Scientific conference (2009, October 06)

Presentation of the researches carried out in the service of the Geomatics Unit, University of Liège: Geodesy and GNSS, Remote Sensing and Photogrammetry, Geographic Information Science, Cartography ... [more ▼]

Presentation of the researches carried out in the service of the Geomatics Unit, University of Liège: Geodesy and GNSS, Remote Sensing and Photogrammetry, Geographic Information Science, Cartography, Spatial Analysis [less ▲]

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See detailSir Stirling Moss
Donnay, Jean-Paul ULiege

Article for general public (2009)

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See detailAnamorphose par ajustement d'un réseau de triangles irréguliers (T.I.N.)
Donnay, Jean-Paul ULiege; Chaidron, Christophe

in Joost, S.; Pointet, A.; Caloz, R. (Eds.) et al De la physique expérimentale aux sciences et systèmes de l'information géographique (2009)

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See detailUne Grande Dame de la géographie au service de la recherche, de l'enseignement et du bien commun
Devillet, Guénaël ULiege; Donnay, Jean-Paul ULiege; Halleux, Jean-Marie ULiege et al

in Bulletin de la Société Géographique de Liège (2009), 52

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See detailAtlas de Belgique - Guide de lecture
Binard, Marc ULiege; De Maeyer, Philippe; De Temmerman, Leen et al

Book published by Academia Press (2008)

Toute personne qui se déplace dans un environnement complexe souhaite pouvoir s'orienter et tente pour ainsi dire de «cartographier» l'espace dans lequel il évolue. Tant les personnes que les institutions ... [more ▼]

Toute personne qui se déplace dans un environnement complexe souhaite pouvoir s'orienter et tente pour ainsi dire de «cartographier» l'espace dans lequel il évolue. Tant les personnes que les institutions ont besoin d'une représentation compréhensible des environnements spatiaux dans lesquels elles vivent et se déplacent. Un troisième Atlas de Belgique est édité afin de répondre à cette nécessité, avec pour objectif d'ordonner l'abondance de données disponibles, principalement en les visualisant dans l'espace. L'actuelle société belge, avec sa complexité, ses fortes différenciations sociales et spatiales, ses anciennes oppositions et ses nouveaux fossés, est ainsi cartographiée. Le troisième 'Atlas de Belgique' tente de présenter les données d'un maximum de sources en faisant ressortir leur composante spatiale. [less ▲]

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See detailAtlas van België: Leeswijzer
Binard, Marc ULiege; De Maeyer, Philippe; De Temmerman, Leen et al

Book published by Academia Press (2008)

Toute personne qui se déplace dans un environnement complexe souhaite pouvoir s'orienter et tente pour ainsi dire de «cartographier» l'espace dans lequel il évolue. Tant les personnes que les institutions ... [more ▼]

Toute personne qui se déplace dans un environnement complexe souhaite pouvoir s'orienter et tente pour ainsi dire de «cartographier» l'espace dans lequel il évolue. Tant les personnes que les institutions ont besoin d'une représentation compréhensible des environnements spatiaux dans lesquels elles vivent et se déplacent. Un troisième Atlas de Belgique est édité afin de répondre à cette nécessité, avec pour objectif d'ordonner l'abondance de données disponibles, principalement en les visualisant dans l'espace. L'actuelle société belge, avec sa complexité, ses fortes différenciations sociales et spatiales, ses anciennes oppositions et ses nouveaux fossés, est ainsi cartographiée. Le troisième 'Atlas de Belgique' tente de présenter les données d'un maximum de sources en faisant ressortir leur composante spatiale. [less ▲]

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See detailQualitative Spatio-Temporal Reasoning & Spatial Database Design
Donnay, Jean-Paul ULiege; Hallot, Pierre ULiege; Laplanche, François

Conference (2007, October 17)

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See detailLes bases de données spatiales
Donnay, Jean-Paul ULiege

in Cahiers de la Documentation (2006), 1

Derrière la « carte », média le plus commun pour accéder à l’information spatiale, il y a des données, qu’il a fallu collecter, mémoriser et gérer, sous forme numérique depuis près d’un demi-siècle. Les ... [more ▼]

Derrière la « carte », média le plus commun pour accéder à l’information spatiale, il y a des données, qu’il a fallu collecter, mémoriser et gérer, sous forme numérique depuis près d’un demi-siècle. Les données, spatiales ou géographiques, présentent plusieurs particularités dont la moindre n’est certes pas la présence, parmi ses caractéristiques, d’une géométrie censée traduire la portion de la surface terrestre portant une ou plusieurs propriétés thématiques. Indépendamment des techniques de collecte de l’information géographique (topographie, photogrammétrie, etc.), des techniques de visualisation (cartographie) et de traitement (analyse spatiale), la seule gestion de l’information a connu une évolution sensible au cours des dernières décennies. Partant de systèmes de fichiers, la gestion de l’information spatiale a successivement fait appel à des modèles de gestion de bases de données de plus en plus élaborés, au point d’exploiter aujourd’hui les ressources les plus pointues des bases de données réparties reposant sur un modèle objet-relationnel. [less ▲]

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See detailTechniques de positionnement par satellites
Donnay, Jean-Paul ULiege; Warnant, René ULiege

in Bulletin de la Société Géographique de Liège (2006), 47

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

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 detailGIS Design and Implementation Methods: The MECOSIG Improvement and Updating Project
Pantazis, Dimos; Donnay, Jean-Paul ULiege; Billen, Roland ULiege

in Proceedings of the 25th UDMS Symposium (2006)

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See detailAnalysis of buildings height computed on a DSM generated from a VHR satellite stereopair
Binard, Marc ULiege; Devriendt, D.; Cornet, Yves ULiege 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 detailFormalisation des informations géographiques en mode maillé
Donnay, Jean-Paul ULiege

in Revue Internationale de Géomatique (2005), 15(4), 415-438

Nowadays a real effort is devoted to the formalization of raster – image – geographic information. From conceptual design to relational modelling, norms and standards are proposed by agencies as well as ... [more ▼]

Nowadays a real effort is devoted to the formalization of raster – image – geographic information. From conceptual design to relational modelling, norms and standards are proposed by agencies as well as commercial companies, for implementing raster data in spatial databases and GIS. At the same time, query languages are enhanced in order to promote the use of raster data in relational spatial algebra. Besides, normalized schemes make raster interoperability possible between distributed GIS, and encourage the emergence of Web services dedicated to raster processing. Hence, it can be expected that raster geographic data will play a major role in the coming spatial data infrastructures. [less ▲]

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See detailLes "systèmes d'information géographique" (SIG) : Préliminaires à un usage dans l'enseignement.
Donnay, Jean-Paul ULiege

in Bulletin de la Société Géographique de Liège (2005), 45

A few years after their insertion into English language education, the geographical information systems (GIS) endeavour to force their way into French language secondary education. Several experiments are ... [more ▼]

A few years after their insertion into English language education, the geographical information systems (GIS) endeavour to force their way into French language secondary education. Several experiments are carried out, individually or institutionally. However they do not dispel the ambiguity about the GIS concept. On the contrary, they tend to consider GIS as no more than a software support, essentially devoted to cartography. This communication tries to show the difference between, on the one hand, a GIS in the meaning given by the systemic modelling of organizations, and, on the other hand, a GIS software able to be used in secondary education. [less ▲]

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See detailDSM from SPOT5-HRS images: extraction and validation
Cornet, Yves ULiege; Grevesse, J.; Binard, Marc ULiege 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 detailMECOSIG Adapted to the Design of Distributed GIS
Pasquasy, Fabien; Laplanche, François; Sainte, Jean-Christophe et al

in OTM 2005 Workshops (2005)

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