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Seroprevalence of malaria in inhabitants of the urban zone of Antananarivo, Madagascar / Olivier Domarle in Malaria Journal, n° 5 ([01/11/2006])
[article]
Titre : Seroprevalence of malaria in inhabitants of the urban zone of Antananarivo, Madagascar Type de document : Article/Communication Auteurs : Olivier Domarle, Auteur ; Romy Razakandrainibe, Auteur ; Emma Rakotomalala, Auteur ; Laurence Jolivet , Auteur ; Rindra Vatosoa Randremanana, Auteur ; F. Rakotomanana, Auteur ; Charles Emile Ramarokoto, Auteur ; Jean-Louis Soares, Auteur ; Frédéric Ariey, Auteur Année de publication : 2006 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] maladie parasitaire
[Termes IGN] population urbaine
[Termes IGN] risque sanitaire
[Termes IGN] rizière
[Termes IGN] Tananarive (Madagascar)Résumé : (auteur) Background : Antananarivo, the capital of Madagascar, is located at an altitude of over 1,200 m. The environment at this altitude is not particularly favourable to malaria transmission, but malaria nonetheless remains a major public health problem. The aim of this study was to evaluate exposure to malaria in the urban population of Antananarivo, by measuring the specific seroprevalence of Plasmodium falciparum.
Methods : Serological studies specific for P. falciparum were carried out with an indirect fluorescent antibody test (IFAT). In a representative population of Antananarivo, 1,059 healthy volunteers were interviewed and serum samples were taken.
Results : The seroprevalence of IgG+IgA+IgM was 56.1% and that of IgM was 5.9%. The major risk factor associated with a positive IgG+IgA+IgM IFAT was travel outside Antananarivo, whether in the central highlands or on the coast. The abundance of rice fields in certain urban districts was not associated with a higher seroprevalence.
Conclusion : Malaria transmission levels are low in Antananarivo, but seroprevalence is high. Humans come into contact with the parasite primarily when travelling outside the city. Further studies are required to identify indigenous risk factors and intra-city variations more clearly.Numéro de notice : A2006-303 Affiliation des auteurs : COGIT+Ext (1988-2011) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1186/1475-2875-5-106 Date de publication en ligne : 10/11/2006 En ligne : https://doi.org/10.1186/1475-2875-5-106 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93947
in Malaria Journal > n° 5 [01/11/2006][article]Agent-based modelling of shifting cultivation field patterns, Vietnam / M.R. Jepsen in International journal of geographical information science IJGIS, vol 20 n° 9 (october 2006)
[article]
Titre : Agent-based modelling of shifting cultivation field patterns, Vietnam Type de document : Article/Communication Auteurs : M.R. Jepsen, Auteur ; S. Leisz, Auteur ; K. Rasmussen, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 1067 - 1085 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] analyse comparative
[Termes IGN] analyse de groupement
[Termes IGN] classification barycentrique
[Termes IGN] cultures
[Termes IGN] figure géométrique
[Termes IGN] image Landsat-TM
[Termes IGN] image Terra-ASTER
[Termes IGN] segmentation d'image
[Termes IGN] simulation
[Termes IGN] spatial metrics
[Termes IGN] surface cultivée
[Termes IGN] système multi-agents
[Termes IGN] utilisation du sol
[Termes IGN] Viet NamRésumé : (Auteur) Shifting cultivation in the Nghe An Province of Vietnam's Northern Mountain Region produces a characteristic land-cover pattern of small and larger fields. The pattern is the result of farmers cultivating either individually or in spatially clustered groups. Using spatially explicit agent-based modelling, and relying on empirical data from fieldwork and observations for parameterization of variables, the level of clustering in agricultural fields observed around a study village is reproduced. Agents in the model act to maximize labour productivity, which is based on potential yield and labour costs associated with fencing of fields, and are faced with physical constraints. The simulation results are compared with land-cover data obtained from remote sensing. Comparisons are made on patterns as detected visually and using the mean nearest-neighbour ratio. Baseline simulation outputs show high degrees of spatial clustering and similarity to the land-cover data, but also a need for further calibration of model variables and controls. Copyright Taylor & Francis Numéro de notice : A2006-424 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600830848 En ligne : https://doi.org/10.1080/13658810600830848 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28148
in International journal of geographical information science IJGIS > vol 20 n° 9 (october 2006) . - pp 1067 - 1085[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-06091 RAB Revue Centre de documentation En réserve L003 Disponible 079-06092 RAB Revue Centre de documentation En réserve L003 Disponible Mesures agri-environnementales dans la Manche / L. Alborino in Géomatique expert, n° 52 (01/09/2006)
[article]
Titre : Mesures agri-environnementales dans la Manche Type de document : Article/Communication Auteurs : L. Alborino, Auteur ; F. Souprayen, Auteur ; D. Toquet, Auteur Année de publication : 2006 Article en page(s) : pp 38 - 45 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] analyse des besoins
[Termes IGN] ArcView
[Termes IGN] base de données localisées
[Termes IGN] développement agricole
[Termes IGN] données environnementales
[Termes IGN] données localisées
[Termes IGN] impact sur l'environnement
[Termes IGN] Manche (50)
[Termes IGN] outil d'aide à la décision
[Termes IGN] parc naturel régional
[Termes IGN] parcelle agricole
[Termes IGN] production agricole
[Termes IGN] protection de l'environnement
[Termes IGN] risque environnemental
[Termes IGN] Spatial Analyst
[Termes IGN] système d'information géographiqueRésumé : (Auteur) Il y a deux ans déjà, le Parc Naturel Régional des Marais du Cotentin et du Bessin, en les personnes de Manuel Chrétienne et de Laurent Alborino, était intervenu lors des Journées ESRI SIG 2004 en proposant une communication intitulée « L'Applicatif Mesures Agri-Environnementales (OLAE, CTE, CAD, Natura 2000), un outil d'aide à la décision : de l'état des lieux au prospectif... » Cette première réflexion, et les travaux qui ont suivi, est à l'origine du projet présenté aujourd'hui par l'ADASEA de la Manche et le Parc Naturel Régional des Marais du Cotentin et du Bessin. Il est le fruit d'un partenariat constructif entre deux organismes œuvrant sur des thématiques proches et parfois complémentaires. La collaboration entre l'ADASEA et le Parc Naturel Régional a permis de mettre en place un stage dont l'objectif est de créer une base de données géographiques pour le suivi, l'évaluation et la valorisation des mesures agri-environnementales dans le département de la Manche. Copyright CiMax Numéro de notice : A2006-399 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28123
in Géomatique expert > n° 52 (01/09/2006) . - pp 38 - 45[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 265-06051 RAB Revue Centre de documentation En réserve L003 Disponible Resolution dependent errors in remote sensing of cultivated areas / M. Ozdogan in Remote sensing of environment, vol 103 n° 2 (30/07/2006)
[article]
Titre : Resolution dependent errors in remote sensing of cultivated areas Type de document : Article/Communication Auteurs : M. Ozdogan, Auteur ; Curtis E. Woodcock, Auteur Année de publication : 2006 Article en page(s) : pp 203 - 217 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] analyse comparative
[Termes IGN] analyse de sensibilité
[Termes IGN] Californie (Etats-Unis)
[Termes IGN] Chine
[Termes IGN] cultures
[Termes IGN] distribution spatiale
[Termes IGN] erreur de classification
[Termes IGN] image Ikonos
[Termes IGN] limite de résolution géométrique
[Termes IGN] précision infrapixellaire
[Termes IGN] seuillage d'image
[Termes IGN] surface cultivée
[Termes IGN] variogrammeRésumé : (Auteur) Remote sensing has become a common and effective method for estimating the areal coverage of land cover classes. One class of particular interest is agriculture as area estimates of cultivated lands are important for purposes such as estimating yields or irrigation needs. The synoptic coverage of satellite imagery and the relative ease of automated analysis have led to widespread mapping of agriculture using remote sensing. The accuracy of area estimates derived from these maps is known to be related to the accuracy of the maps. However, even in the situation where the map is very accurate, errors in area estimates may occur. These errors result from the behavior of the distribution of subpixel proportions of cultivated areas, and how that behavior changes as a result of sensor spatial resolution and class definitions. The sensitivity of estimates of cultivated areas to sensor spatial resolution and to the choice of threshold used to define cultivated land is explored in six agriculturally distinct locations around the world. Using a beta model for the distribution of subpixel proportions that is parameterized using variograms, it is possible to model the distribution of subpixel proportions for any spatial resolution. When the spatial resolution is small with respect to the spatial structure of the landscape (as measured by the variogram range) use of any class definition threshold produces an estimate very close to the true area coverage. On the other hand, as the resolution becomes coarse in relation to the variogram range, the subpixel proportions are no longer concentrated at the extremes of the distribution and the difference between the estimated and the true area has greater sensitivity to the selected threshold used to define classes. Thus, for the cases examined here, both the resolution and the class definition threshold have a strong influence on area estimates. The spatial resolutions where errors can be large depend on landscape spatial structure, which can be quantified using variograms. The net effect is that for the same spatial resolution, some places will exhibit much larger errors in area estimates than others. For the site in the Anhui province of China, where agricultural fields are very small (0.07 ha on the average), area estimates are highly sensitive to class definition thresholds even at the relatively fine resolution of 45 m. Conversely, in California (USA) spatial resolutions as coarse as 500 m can be used to reliably estimate cultivated areas. Results also suggest that the proportion of the total area that is cultivated significantly influences the accuracy of area estimates. When the area proportion is low, the class definition threshold must also be low to achieve an accurate area estimate. Conversely, in areas dominated by agriculture, a very stringent class definition of cultivated lands is required for accurate area estimates. While explored in the context of estimation of cultivated areas, the findings presented here are generic to the problem of area estimation using remote sensing. Copyright Elsevier Numéro de notice : A2006-321 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2006.04.004 En ligne : https://doi.org/10.1016/j.rse.2006.04.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28045
in Remote sensing of environment > vol 103 n° 2 (30/07/2006) . - pp 203 - 217[article]Comparison of automated watershed delineations: effects on land cover areas, percentages, and relationships to nutrient discharges / M.E. Baker in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 2 (February 2006)
[article]
Titre : Comparison of automated watershed delineations: effects on land cover areas, percentages, and relationships to nutrient discharges Type de document : Article/Communication Auteurs : M.E. Baker, Auteur ; D.E. Weller, Auteur ; T.E. Jordan, Auteur Année de publication : 2006 Article en page(s) : pp 159 - 168 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] analyse comparative
[Termes IGN] automatisation
[Termes IGN] bassin hydrographique
[Termes IGN] Chesapeake (baie de)
[Termes IGN] détection de contours
[Termes IGN] modèle numérique de surface
[Termes IGN] nitrate
[Termes IGN] occupation du sol
[Termes IGN] parcelle agricole
[Termes IGN] sédimentRésumé : (Auteur) We compared manual delineations with those derived from ten automated delineations of 420 watersheds in four physiographic provinces of the Chesapeake Basin. Automated methods included commercial DEM-based routines and different parameterizations of four enhanced methods: stream burning, normalized excavation, surface reconditioning, and normalized reconditioning. Un-enhanced methods resulted in individual watershed boundaries with some gross discrepancies in watershed size relative to manual delineations (error rate of 0.22 > 25 percent difference compared to manual) and significantly different watershed size distributions (Mann-Whitney U p = 0.012). Integrating mapped streams through enhanced methods substantially improved correspondence with manual watersheds (error rates of only 0.08-0.02 > 25 percent difference). Analysis of cropland area among methods showed a significant difference between manual estimates and un-enhanced estimates (p = 0.049) that was corrected using enhanced algorithms. Subsequent analysis of percent cropland revealed that measurements of land cover proportions were not always affected by delineation errors. However, differences were large enough to influence regressions with stream nitrate-N at the 90 percent confidence level within one physiographic province. Enhanced delineations produced statistical relationships between percent cropland and nitrate-N concentrations consistent with manual delineations. The results provide support for enhanced automated watershed delineation within the Chesapeake Basin and suggest that normalized excavation can be an effective augmentation of existing stream burning and reconditioning procedures. Numéro de notice : A2006-038 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.72.2.159 En ligne : https://doi.org/10.14358/PERS.72.2.159 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27765
in Photogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 2 (February 2006) . - pp 159 - 168[article]Field area checks using GPS (2), from theory to practice / S. Kay in GIM international, vol 20 n° 1 (January 2006)PermalinkGéosol, cartographie internet à l'aide de logiciels libres / B. Toutain in Géomatique expert, n° 48 (01/01/2006)PermalinkInfluence de l'organisation spatiale du parcellaire, des pratiques agricoles et des éléments du paysage sur les densités du carpocapse, un bio-agresseur du pommier / Bernadette Ricci (2006)PermalinkSemi-automatic rural land cover classification from high-resolution remote sensing images = Classification semi-automatique du terrain en zone rurale par télédétection à haute résolution / Roger Trias-Sanz (2006)PermalinkUne gestion satellitale des vignobles / M. Mayo in Géomètre, n° 2021 (décembre 2005)PermalinkMonitoring and modelling cropland loss in rapidly growing urban and depopulating rural counties using remotely sensed data and GIS / A.N. Petrov in Geocarto international, vol 20 n° 4 (December 2005 - February 2006)PermalinkSIG, chorèmes et systèmes multi-agent : évolution d'un système rural martiniquais et pression polluante / M. Houdart in Revue internationale de géomatique, vol 15 n° 3 (septembre – novembre 2005)PermalinkUpdating land cover classification using a rule-based decision system / Damien Raclot in International Journal of Remote Sensing IJRS, vol 26 n° 7 (April 2005)PermalinkEvaluation of a rough soil surface description with ASAR-ENVISAT radar data / Mehrez Zribi in Remote sensing of environment, vol 95 n° 1 (15/03/2005)PermalinkAnalysis of land use drivers at the watershed and household level: Linking two paradigms at the Philippine forest fringe / K.P. Overmars in International journal of geographical information science IJGIS, vol 19 n° 2 (february 2005)Permalink