Christiane Weber - Profile on Academia.edu (original) (raw)

Mountain and Volcanic Surface-Processes papers by Christiane Weber

2014),"Towards a rapid automatic detection of building damage using remote sensing for disaster m... more 2014),"Towards a rapid automatic detection of building damage using remote sensing for disaster management ", Disaster Prevention and Management, Vol. 23 Iss 1 pp. 53 -66 Permanent link to this document: http://dx.

Papers by Christiane Weber

Reçu le 18 octobre 2010 ; accepté le 15 février 2011 Disponible sur Internet le 24 mars 2011 MOTS... more Reçu le 18 octobre 2010 ; accepté le 15 février 2011 Disponible sur Internet le 24 mars 2011 MOTS CLÉS Environnement alimentaire ; Systèmes d'information géographique ; Accessibilité spatiale ; Proximité ; Disponibilité

We conducted an environmental justice study of the spatial distribution of sport facilities, a ma... more We conducted an environmental justice study of the spatial distribution of sport facilities, a major resource for physical activity, in the Paris Region in France. Comprehensive data of the French Census of Sport Facilities allowed us to investigate disparities not only in the spatial accessibility to facilities, but also in the characteristics of these facilities. We found that the associations between area income and the presence of facilities or favorable characteristics of these facilities varied from positive to negative depending on the facilities and on the characteristics examined. Sensitivity analyses defining area income in circular areas of different radii permitted a refined identification of areas underserved in sport facilities.

The Science of the total environment, Jan 15, 2014

When designing air pollution reduction policies, regional decision makers face a limited budget t... more When designing air pollution reduction policies, regional decision makers face a limited budget to choose the most efficient measures which will have impacts on several pollutants in different ways. RIAT+ is a regional integrated assessment tool that supports the policy maker in this selection of the optimal emission reduction technologies, to improve air quality at minimum costs. In this paper, this tool is formalized and applied to the specific case of a French region (Alsace), to illustrate how focusing on one single pollutant may exacerbate problems related to other pollutants, on top of conflicts related to budget allocation. In our case, results are shown for possible trade-offs between NO2 and O3 control policies. The paper suggests an approach to prioritize policy maker objectives when planning air pollution policies at regional scale.

PloS one, 2014

Exposure to traffic is an established risk factor for the triggering of myocardial infarction (MI... more Exposure to traffic is an established risk factor for the triggering of myocardial infarction (MI). Particulate matter, mainly emitted by diesel vehicles, appears to be the most important stressor. However, the possible influence of benzene from gasoline-fueled cars has not been explored so far. We conducted a case-crossover study from 2,134 MI cases recorded by the local Coronary Heart Disease Registry (2000-2007) in the Strasbourg Metropolitan Area (France). Available individual data were age, gender, previous history of ischemic heart disease and address of residence at the time of the event. Nitrogen dioxide, particles of median aerodynamic diameter <10 µm (PM10), ozone, carbon monoxide and benzene air concentrations were modeled on an hourly basis at the census block level over the study period using the deterministic ADMS-Urban air dispersion model. Model input data were emissions inventories, background pollution measurements, and meteorological data. We have found a posit...

PLoS ONE, 2014

Changes in sedentary behaviours and physical activity according to retirement status need to be b... more Changes in sedentary behaviours and physical activity according to retirement status need to be better defined. Retirement is a critical life period that may influence a number of health behaviours. We assessed past-year sedentary behaviours (television, computer and reading time during leisure, occupational and domestic sitting time, in h/week) and physical activity (leisure, occupational and domestic, in h/week) over 6 years (2000-2001 and 2007) using the Modifiable Activity Questionnaire in 2,841 participants (mean age: 57.365.0 y) of the SU.VI.MAX (Supplementation with Antioxidants and Minerals) cohort. Analyses were performed according to retirement status. Subjects retired in 2001 and 2007 (40%) were those who spent most time in sedentary behaviour and in physical activity during and outside leisure (p,0.001). Leisuretime sedentary behaviours increased in all subjects during follow-up (p,0.001), but subjects who retired between 2001 and 2007 (31%) were those who reported the greatest changes (+8.460.42 h/week for a combined indicator of leisure-time sedentary behaviour). They also had the greatest increase in time spent in leisure-time physical activity (+2.560.2 h/week). In subjects not retired 2001 and 2007 (29%), changes in time spent watching television were found positively associated with an increase in occupational physical activity (p = 0.04) and negatively associated with changes in leisure-time physical activity (p = 0.02). No consistent association between changes in sedentary behaviours and changes in physical activity was observed in subjects retired in 2001 and 2007. Public health interventions should target retiring age populations not only to encourage physical activity but also to limit sedentary behaviours. Except for vigorous leisure time physical activity and swimming, all values for changes are significantly different from 0. {{ All values for changes are significantly different from 0. {{{ Except for reading, domestic physical activity, vigorous leisure physical activity, walking, gardening and biking, all values for changes are significantly different from 0.

PAISARC (+) Project: Atmospheric Pollution, Social Inequalities, Asthma and Cardiac Risk: Influence of Neighbourhood Context

Epidemiology, 2009

ABSTRACT

PLoS ONE, 2012

Purpose: Previous research on the influence of the food environment on weight status has often us... more Purpose: Previous research on the influence of the food environment on weight status has often used impersonal measures of the food environment defined for residential neighborhoods, which ignore whether people actually use the food outlets near their residence. To assess whether supermarkets are relevant contexts for interventions, the present study explored between-residential neighborhood and between-supermarket variations in body mass index (BMI) and waist circumference (WC), and investigated associations between brands and characteristics of supermarkets and BMI or WC, after adjustment for individual and residential neighborhood characteristics.

The utility of texture analysis to improve per‐pixel classification for high to very high spatial resolution imagery

International Journal of Remote Sensing, 2005

Earth observation data are becoming available at increasingly finer resolutions. Sensors already ... more Earth observation data are becoming available at increasingly finer resolutions. Sensors already in existence (IKONOS, Quickbird, SPOT 5, Orbview) or due to be launched in the near future will reach 1-5 m resolution. These very high resolution (VHR) data will provide more ...

International Journal of Health Geographics, 2011

Background: There is growing interest in the study of the relationships between individual health... more Background: There is growing interest in the study of the relationships between individual health-related behaviours (e.g. food intake and physical activity) and measurements of spatial accessibility to the associated facilities (e.g. food outlets and sport facilities). The aim of this study is to propose measurements of spatial accessibility to facilities on the regional scale, using aggregated data. We first used a potential accessibility model that partly makes it possible to overcome the limitations of the most frequently used indices such as the count of opportunities within a given neighbourhood. We then propose an extended model in order to take into account both home and work-based accessibility for a commuting population.

International Conference on Image Analysis and Recognition, 2010

Road extraction research has always been an active research on automatic identification of remote... more Road extraction research has always been an active research on automatic identification of remote sensing images. With the availability of high spatial resolution images from new generation commercial sensors, how to extract roads quickly, accurately and automatically has been a cutting-edge problem in remote sensing related fields. In this paper, we present a novel road extraction approach which uses a

Towards a rapid automatic detection of building damage using remote sensing for disaster management: The 2010 Haiti earthquake

Disaster Prevention and Management, 2014

ABSTRACT Purpose ‐ Satellite and airborne images are increasingly used at different stages of dis... more ABSTRACT Purpose ‐ Satellite and airborne images are increasingly used at different stages of disaster management, especially in the detection of infrastructure damage. Although semi- or full automatic techniques to detect damage have been proposed, they have not been used in emergency situations. Damage maps produced by international organisations are still based on visual interpretation of images, which is time- and labour-consuming. The purpose of this paper is to investigate how an automatic mapping of damage can be helpful for a first and rapid assessment of building damage. Design/methodology/approach ‐ The study area is located in Port-au-Prince (Haiti) stricken by an earthquake in January 2010. To detect building damage, the paper uses optical images (15?cm of spatial resolution) coupled with height data (LiDAR, 1?m of spatial resolution). By undertaking an automatic object-oriented classification, the paper identifies three categories of building damages: intact buildings, collapsed buildings and debris. Findings ‐ Data processing for the study area covering 11?km2 took about 15 hours. The accuracy of the classification varies from 70 to 79 per cent depending to the methods of assessment. Causes of errors are numerous: limited spectral information of the optical images, resolution difference between the two data, high density of buildings but most importantly, certain types of building collapses could not be detected by vertically taken images (the case of data in this study). Originality/value ‐ The automatic damage mapping developed in this paper proves to be reliable and could be used in emergency situations. It could also be combined with manual visual interpretation to accelerate the planning of humanitarian rescues and reconstruction.

Measuring the food environment using geographical information systems: a methodological review

Through a literature review, we investigated the geographic information systems (GIS) methods use... more Through a literature review, we investigated the geographic information systems (GIS) methods used to define the food environment and the types of spatial measurements they generate. Review study. Searches were conducted in health science databases, including Medline/Pubmed, PsycINFO, Francis and GeoBase. We included studies using GIS-based measures of the food environment published up to 1 June 2008. Twenty-nine papers were included. Two different spatial approaches were identified. The density approach quantifies the availability of food outlets using the buffer method, kernel density estimation or spatial clustering. The proximity approach assesses the distance to food outlets by measuring distances or travel times. GIS network analysis tools enable the modelling of travel time between referent addresses (home) and food outlets for a given transportation network and mode, and the assumption of travel routing behaviours. Numerous studies combined both approaches to compare food outlet spatial accessibility between different types of neighbourhoods or to investigate relationships between characteristics of the food environment and individual food behaviour. GIS methods provide new approaches for assessing the food environment by modelling spatial accessibility to food outlets. On the basis of the available literature, it appears that only some GIS methods have been used, while other GIS methods combining availability and proximity, such as spatial interaction models, have not yet been applied to this field. Future research would also benefit from a combination of GIS methods with survey approaches to describe both spatial and social food outlet accessibility as important determinants of individual food behaviours.