References of "Cybergeo : Revue Européenne de Géographie = Cybergeo - European Journal of Geography"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailThe tsunami in South-East Asia – a retrospective analysis of the management of an apocalyptic natural disaster
Ozer, Pierre ULg; De Longueville, Florence ULg

in Cybergeo : Revue Européenne de Géographie = Cybergeo - European Journal of Geography (2011)

The tsunami that affected the coasts of the Indian ocean on December 26, 2004 claimed close to 226 000 lives, mainly on the island of Sumatra, Indonesia, which suffered overwhelming devastation. This ... [more ▼]

The tsunami that affected the coasts of the Indian ocean on December 26, 2004 claimed close to 226 000 lives, mainly on the island of Sumatra, Indonesia, which suffered overwhelming devastation. This article asks whether a tsunami warning system is needed in the Indian Ocean, where the probability of experiencing a similar catastrophe is very small. In addition, other alternatives, including land use planning and education focused on tsunami risk management, are presented. Their application could considerably reduce financial and human losses if a disaster of this nature was to occur again. [less ▲]

Detailed reference viewed: 38 (1 ULg)
Full Text
Peer Reviewed
See detailPrésence de la publicité automobile dans la presse écrite belge : Analyse des quotidiens La Libre Belgique et Le Soir et des hebdomadaires Trends-Tendances et Le Vif-L’Express
Ozer, Pierre ULg

in Cybergeo : Revue Européenne de Géographie = Cybergeo - European Journal of Geography (2008)

Aspects relating to the environment, and more particularly climate change, are increasingly holding the stage when it comes to the way the media processes information. Of course, the link between climate ... [more ▼]

Aspects relating to the environment, and more particularly climate change, are increasingly holding the stage when it comes to the way the media processes information. Of course, the link between climate change and winters without snow, so-called exceptional flooding, devastating hurricanes or summer heatwaves is perfect material for the headlines of dailies and weeklies. But, what’s more, the concept of global warming is systematically in the headlines because it has become a major stake for society, the environment and the economy. Thus, the written press is calling upon its readers to be conscious of this problem but also to play an active role in this domain. Subsequently, the press tends to call upon us – to its credit – in relation to “good practices” to stop us from wasting energy, and proposes alternatives, which, in general, are not very restrictive. Often, the choice of a “clean” car appears to be an alternative. But compared with the car industry, is the written press coherent with what it puts on paper and the actions it promotes through the adverts it authorises for publication? Therefore, the objective of this paper is to provide an answer to the following three questions: 1] What is the position of car advertising in the written press? 2] What level of emissions are promoted in this advertising in relation to the objectives to be achieved? 3] What could be the solutions to this problem? A detailed analysis of car advertising was carried out in 2006 in four bodies of the Belgian French-speaking written press. The results of this study show that advertising boasts of cars which, in terms of CO2 emissions per kilometre, are from another age, and clearly contradict the values recommended in the in-depth articles written by the journalists of this type of media. [less ▲]

Detailed reference viewed: 232 (41 ULg)
Full Text
Peer Reviewed
See detailUrban Ontologies for an improved communication in urban civil engineering projects
Teller, Jacques ULg; Keita, Abdelkader; Roussey, Catherine et al

in Cybergeo : Revue Européenne de Géographie = Cybergeo - European Journal of Geography (2007)

In this paper, we presented the Towntology project whose objective is to design an ontology in the urban field. This project is divided into several stages. Concerning the prime main objective of the ... [more ▼]

In this paper, we presented the Towntology project whose objective is to design an ontology in the urban field. This project is divided into several stages. Concerning the prime main objective of the Towntology project, i.e. to build an ontology for urban planning by integrating all urban objects with their descriptions and relations, we began to deal with some fields, such as street planning and mobility. We also developed a software tool making it possible to urban planners to work on a semantic network. Thus we built a visual browser and an ontology editor. An extension of XML is designed and used for the description of the ontology. [less ▲]

Detailed reference viewed: 122 (10 ULg)
Full Text
Peer Reviewed
See detailTsunami en Asie du Sud-Est : retour sur la gestion d’un cataclysme naturel apocalyptique
Ozer, Pierre ULg; De Longueville, Florence ULg

in Cybergeo : Revue Européenne de Géographie = Cybergeo - European Journal of Geography (2005)

The tsunami that affected the Indian ocean’s rims on December 26, 2004 claimed close to 226 000 deaths, essentially on the island of Sumatra, Indonesia, which suffered overwhelming devastation. This ... [more ▼]

The tsunami that affected the Indian ocean’s rims on December 26, 2004 claimed close to 226 000 deaths, essentially on the island of Sumatra, Indonesia, which suffered overwhelming devastation. This article asks whether a tsunami warning system is needed in the Indian Ocean where the probability to experience a similar catastrophe is very scarce. In addition, other alternatives including land use planning and education focused on tsunami risk management are presented. Their application could strongly reduce financial and human losses if such hazard had to occur again. [less ▲]

Detailed reference viewed: 72 (12 ULg)
Full Text
Peer Reviewed
See detailAnalyse climatique de la région de Gouré, Niger oriental : récentes modifications et impacts environnementaux
Ozer, Pierre ULg; Bodart, Catherine ULg; Tychon, Bernard ULg

in Cybergeo : Revue Européenne de Géographie = Cybergeo - European Journal of Geography (2005)

Since the late 1960s, the Sahel is affected by a dramatic drought. This article analyses climatic variations recorded in the Gouré area, eastern Niger, between 1936 and 2003. It appears that the drought ... [more ▼]

Since the late 1960s, the Sahel is affected by a dramatic drought. This article analyses climatic variations recorded in the Gouré area, eastern Niger, between 1936 and 2003. It appears that the drought ended in the late 1980s. However, the rainfall increase did not lead to an extension of the length of the rainy season. The study of the wind shows that correct data were recorded during the two first years of the station of Gouré (1984 and 1985). Afterwards, wind speed was entached by errors and did not report since 1997. The situation is alarming as we know that neighbouring stations meet the same problems and that no synoptic station currently reports wind values in eastern Niger. However, based on wind speed and deflation data recorded in 1984, a threshold wind speed of 7 m/s was determined in Gouré. Finally, from measurements of horizontal visibility reduced by mineral dust, our results suggest that air quality is reduced because of the high frequency of wind erosion. The confrontation of our results with recent environmental studies in that region show that the end of the drought did not lead to any landscape improvement. Increasing human pressure tends to be the main driving factor of land degradation. [less ▲]

Detailed reference viewed: 188 (48 ULg)
Full Text
Peer Reviewed
See detailMise en évidence des zones touchées par la désertification par télédétection a basse résolution au Niger
Hountondji, Yvon ULg; Ozer, Pierre ULg; Nicolas, Jacques ULg

in Cybergeo : Revue Européenne de Géographie = Cybergeo - European Journal of Geography (2004)

In order to identify areas where desertification may have occurred over the last two decades, 109 stations located in three bioclimatic zones of Niger are analyzed. Time series of remote sensing data are ... [more ▼]

In order to identify areas where desertification may have occurred over the last two decades, 109 stations located in three bioclimatic zones of Niger are analyzed. Time series of remote sensing data are well suited to this task. Here, we use time series of NOAA AVHRR normalized difference vegetation index (NDVI) data and rainfall data. In this study, trend analysis is used to identify areas within the biomes from 1981 to 1999 in Niger with apparent land degradation in semi-arid areas. It appears that most of Niger (98%) recorded increasing rainfall while only 76% experienced increasing maximum NDVI. However, the combination of the two variables through the ratio shows a widespread reduction of the rain-use efficiency with non significant trend for the stations located in northern Sahel (p=0.52), highly significant for those located in central Sahel (p=0.00009) and significant in southern Sahel (p=0.041). Overall, 75.3% of the sample recorded a significant reduction of the NDVIMax/RR ratio. Only one station out of four (24.7%) presented a stability of the ratio. These negative trends suggest a progressive diminution of the vegetation productivity as highlighted by the lowering of the NDVIMax/RR ratio. This situation suggest a consistently environmental degradation and that desertification processes continued during the last two decades over most of the Sahelian belt of Niger. [less ▲]

Detailed reference viewed: 103 (29 ULg)
Full Text
Peer Reviewed
See detailA field-based crop and land use map over Sanjiang plain in Heilongjiang derived from multi-temporal imagery of Landsat7-ETM+
Eerens, Herman; Dong, Qinghan; Ozer, Pierre ULg et al

in Cybergeo : Revue Européenne de Géographie = Cybergeo - European Journal of Geography (2003)

Multitemporal Landsat7-ETM+ imagery and supplementary field survey data were used to establish a crop and land use map for an area of ±20 000 km² of Sanjiang Plain in China’s north-eastern province ... [more ▼]

Multitemporal Landsat7-ETM+ imagery and supplementary field survey data were used to establish a crop and land use map for an area of ±20 000 km² of Sanjiang Plain in China’s north-eastern province Heilongjiang. The “field-based” map is based on data of the year 2002 and is created by combining the results of a supervised Maximum Likelihood classification with the estimated field boundaries extracted by an automatic segmentation procedure. No sufficient ground truth was available to perform an independent validation, and some classes are certainly confused. Nevertheless, given the minimal investments and the unexplored potentials for improvement, the approach seems very promising and cost-effective. By superimposing the classification with the map of the administrative counties, regional statistics were derived with the acreage distributions of the concerned crops and land use types. [less ▲]

Detailed reference viewed: 40 (6 ULg)
Full Text
Peer Reviewed
See detailThe metropolis-hastings algorithm, a handy tool for the practice of environmental model estimation : illustration with the biochemical oxygen demand data
Torre, F.; Boreux, Jean-Jacques ULg; Parent, E.

in Cybergeo : Revue Européenne de Géographie = Cybergeo - European Journal of Geography (2001), 187

Environmental scientists often face situations where: (i) stimulus-response relationships are non-linear; (ii) data are rare or imprecise; (iii) facts are uncertain and stimulus-responses relationships ... [more ▼]

Environmental scientists often face situations where: (i) stimulus-response relationships are non-linear; (ii) data are rare or imprecise; (iii) facts are uncertain and stimulus-responses relationships are questionable.In this paper, we focus on the first two points. A powerful and easy-to-use statistical method, the Metropolis-Hastings algorithm, allows the quantification of the uncertainty attached to any model response. This stochastic simulation technique is able to reproduce the statistical joint distribution of the whole parameter set of any model. The Metropolis-Hastings algorithm is described and illustrated on a typical environmental model: the biochemical oxygen demand (BOD). The aim is to provide a helpful guideline for further, and ultimately more complex, models. As a first illustration, the MH-method is also applied to a simple regression example to demonstrate to the practitioner the ability of the algorithm to produce valid results. [less ▲]

Detailed reference viewed: 57 (3 ULg)