References of "Kasprzyk, Jean-Paul"
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See detailMéthodologie de recherche en cartographie criminelle
Donnay, Jean-Paul ULg; Trotta, Marie ULg; Kasprzyk, Jean-Paul ULg

Scientific conference (2013, April 26)

Presentation of the original research methods conducted by the Geomatics unit of the University of Liege, on environmental criminology, geographic profiling, and business intelligence in crime mapping.

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See detailReconstitution of the Journeys to Crime and Location of Their Origin in the Context of a Crime Series. A Raster Solution for a Real Case Study
Kasprzyk, Jean-Paul ULg; Trotta, Marie ULg; Donnay, Jean-Paul ULg et al

in Leitner, Michael (Ed.) Crime Modeling and Mapping Using Geospatial Technologies (2012)

In the region of Charleroi (Belgium), a series of criminal acts were committed by the same group, using the same vehicle. The events were located in space and time. The car used during these criminal ... [more ▼]

In the region of Charleroi (Belgium), a series of criminal acts were committed by the same group, using the same vehicle. The events were located in space and time. The car used during these criminal activities was stolen (first event) and was later retrieved (last event) after a period of 4 days of offences. Police recorded a crucial clue: the total mileage covered by the vehicle between the first and the last event was estimated with an admissible approximation. Thanks to this information, we were able to choose the most probable journey-to-crime among several scenarios. These depended on the combination of cost surfaces built with distance propagation algorithms starting from each criminal event in raster mode. The distance propagations were limited to the road network and the combinations of the cost surfaces had to respect the chronology of the facts. The most plausible scenario suggested that the criminals hided the car into a withdrawal site between their activities. In order to improve the precision of the location of this withdrawal site, we used a multi-criteria analysis taking account of the journey of the vehicle and other environment variables. At the end of these treatments, the small stretch of road that we isolated actually included the withdrawal site, as confirmed by the police later [less ▲]

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See detailSpatial data warehouses and SOLAP: a new GIS technology
Kasprzyk, Jean-Paul ULg

Scientific conference (2011, October 14)

Multiplication, both in number and variety of databases in recent decades is a potential bottleneck in the process of decision making. Therefore, data warehouses and OLAP (Online Analytical Processing ... [more ▼]

Multiplication, both in number and variety of databases in recent decades is a potential bottleneck in the process of decision making. Therefore, data warehouses and OLAP (Online Analytical Processing) were born respectively to archive and analyse these data at different levels of aggregation. SOLAP (Spatial OLAP) is a technology that combines OLAP and GIS techniques for spatial data. This presentation will discuss the various tools (particularly open source tools) and approaches in this new domain of geomatics. [less ▲]

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See detailConception d'un entrepôt de données géographiques comme outil d'aide à l'analyse criminelle
Kasprzyk, Jean-Paul ULg

Scientific conference (2010, October)

After describing the data used by belgian federal police for criminal analysis, we justify the utility of a spatial data warehouse for the integration and the exploitation of the data: spatial online ... [more ▼]

After describing the data used by belgian federal police for criminal analysis, we justify the utility of a spatial data warehouse for the integration and the exploitation of the data: spatial online analytical processing (SOLAP) and data mining. [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 ULg; Kasprzyk, Jean-Paul ULg; Donnay, Jean-Paul ULg

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 detailA Geocodification for 3D objects terrestrial surveys
Kasprzyk, Jean-Paul ULg; Billen, Roland ULg

in Neutens, Tijs; De Ryck, Marijke; De Maeyer, Philippe (Eds.) Proceedings of the 4th International Workshop on 3D Geo-information (2009, November)

Nowadays, mean 3D data aquisition techniques are photogrammetry and laserscanning. Their advantage is the huge amount of points that can be measured in a very short time on the field. Nevertheless, the ... [more ▼]

Nowadays, mean 3D data aquisition techniques are photogrammetry and laserscanning. Their advantage is the huge amount of points that can be measured in a very short time on the field. Nevertheless, the post-processing associated to these techniques allowing to build a real 3D model from the clouds of points is very long. Therefore, we developed a geocodification ("field to finish") for the 3D data acquisition at a low and/or middle level of details. Despite each point is measured one by one with a total station, the user can gain a lot of time because of the almost-absence of post processing. This paper shows some of the developed techniques and tries to demonstrate the possible complementarity between geocodification, laserscanning and photogrammtry. [less ▲]

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See detailDéveloppement d'une Géocodification 3D pour la modélisation du bâti
Kasprzyk, Jean-Paul ULg

Master's dissertation (2008)

Detailed reference viewed: 132 (33 ULg)