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On the prediction error variance of the common spatial interpolation schemes / P.C. Kyriakidis in International journal of geographical information science IJGIS, vol 20 n° 8 (september 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 8 (september 2006) . - pp 823 - 855 Titre : On the prediction error variance of the common spatial interpolation schemes Type de document : Article/Communication Auteurs : P.C. Kyriakidis, Auteur ; Michael F. Goodchild, Auteur Année de publication : 2006 Article en page(s) : pp 823 - 855 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] interpolation bilinéaire [Termes IGN] interpolation linéaire [Termes IGN] précision géométrique (imagerie) [Termes IGN] propagation d'erreur Résumé : (Auteur) Three forms of linear interpolation are routinely implemented in geographical information science, by interpolating between measurements made at the endpoints of a line, the vertices of a triangle, and the vertices of a rectangle (bilinear interpolation). Assuming the linear form of interpolation to be correct, we study the propagation of error when measurement error variances and covariances are known for the samples at the vertices of these geometric objects. We derive prediction error variances associated with interpolated values at generic points in the above objects, as well as expected (average) prediction error variances over random locations in these objects. We also place all the three variants of linear interpolation mentioned above within a geostatistical framework, and illustrate that they can be seen as particular cases of Universal Kriging (UK). We demonstrate that different definitions of measurement error in UK lead to different UK variants that, for particular expected profiles or surfaces (drift models), yield weights and predictions identical with the interpolation methods considered above, but produce fundamentally different (yet equally plausible from a pure data standpoint) prediction error variances. Copyright Taylor & Francis Numéro de notice : A2006-347 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600711279 En ligne : https://doi.org/10.1080/13658810600711279 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28071 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06081	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06082	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Computing the fuzzy topological relations of spatial objects based on induced fuzzy topology / K. Liu in International journal of geographical information science IJGIS, vol 20 n° 8 (september 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 8 (september 2006) . - pp 857 - 883 Titre : Computing the fuzzy topological relations of spatial objects based on induced fuzzy topology Type de document : Article/Communication Auteurs : K. Liu, Auteur ; Wei Shi, Auteur Année de publication : 2006 Article en page(s) : pp 857 - 883 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] logique floue [Termes IGN] modèle topologique complet [Termes IGN] objet géographique [Termes IGN] relation topologique [Termes IGN] topologie Résumé : (Auteur) For modeling the topological relations between spatial objects, the concepts of a bound on the intersection of the boundary and interior, and the boundary and exterior are defined in this paper based on the newly developed computational fuzzy topology. Furthermore, the qualitative measures for the intersections are specified based on the ?-cut induced fuzzy topology, which are (A???A)(x) Numéro de notice : A2006-348 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810600711345 En ligne : https://doi.org/10.1080/13658810600711345 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28072 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06081	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06082	RAB	Revue	Centre de documentation	En réserve L003	Disponible

OpenCIS: open source GIS-based web community information system / D. Caldeweyher in International journal of geographical information science IJGIS, vol 20 n° 8 (september 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 8 (september 2006) . - pp 885 - 898 Titre : OpenCIS: open source GIS-based web community information system Type de document : Article/Communication Auteurs : D. Caldeweyher, Auteur ; Jinglan Zhang, Auteur ; B. Pham, Auteur Année de publication : 2006 Article en page(s) : pp 885 - 898 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] logiciel libre [Termes IGN] logiciel SIG [Termes IGN] MapScript [Termes IGN] Mapserver Résumé : (Auteur) Geographic Information System (GIS) technology has many applications and plays a vital role in the majority of the daily operations by government and public administration. However, due to its technical complexity and cost, communities lacking the expertise and resources cannot benefit from this technology. The OpenCIS project, a user-friendly free Open Source GIS-based Web Community Information System, seeks to address this issue by bridging the gap between a simple map viewer and full GIS, representing one of the first steps towards the goal of grassroots empowerment through GIS technology. Copyright Taylor & Francis Numéro de notice : A2006-349 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810600711378 En ligne : https://doi.org/10.1080/13658810600711378 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28073 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06081	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06082	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Ad hoc shared-ride trip planning by mobile geosensor networks / Stephan Winter in International journal of geographical information science IJGIS, vol 20 n° 8 (september 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 8 (september 2006) . - pp 899 - 916 Titre : Ad hoc shared-ride trip planning by mobile geosensor networks Type de document : Article/Communication Auteurs : Stephan Winter, Auteur ; Silvia Nittel, Auteur Année de publication : 2006 Article en page(s) : pp 899 - 916 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] méthode heuristique [Termes IGN] mobilité urbaine [Termes IGN] réseau de transport [Termes IGN] trajet (mobilité) [Termes IGN] transport collectif Résumé : (Auteur) Recent developments in miniaturization of computing devices, in location-sensing technology and in ubiquitous short-range wireless networks enable new types of social behaviour. This paper investigates one novel application of these technologies, ad hoc inner-urban shared-ride trip planning: Transportation clients such as pedestrians are seeking ad hoc shared rides from transportation hosts such as private automobiles, buses, taxi cabs or trains. While centralized trip planners are challenged by assigning clients and hosts in an ad hoc manner, in particular for non-scheduled hosts, we consider the transportation network as a mobile geosensor network of agents that interact locally by short-range communication and heuristic wayfinding strategies. This approach is not only fully scalable; we can also demonstrate that with short-range communication, and hence, incomplete transportation network knowledge a system still can deliver near-to-optimal trips. Numéro de notice : A2006-350 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600816664 En ligne : https://doi.org/10.1080/13658810600816664 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28074 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06081	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06082	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A spatial approach to forest-management optimization: linking GIS and multiple objective genetic algorithms / E.I. Ducheyne in International journal of geographical information science IJGIS, vol 20 n° 8 (september 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 8 (september 2006) . - pp 917 - 928 Titre : A spatial approach to forest-management optimization: linking GIS and multiple objective genetic algorithms Type de document : Article/Communication Auteurs : E.I. Ducheyne, Auteur ; R.R. DE Wulf, Auteur ; Bernard De Baets, Auteur Année de publication : 2006 Article en page(s) : pp 917 - 928 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] algorithme génétique [Termes IGN] forêt [Termes IGN] forêt tempérée [Termes IGN] optimisation (mathématiques) [Termes IGN] outil d'aide à la décision [Termes IGN] sylviculture Résumé : (Auteur) Forest-management decision-support systems are largely monolithic structures. Spatial details are left out during the optimization process and are elaborated during the operational planning. This might produce misleading results and plans that are impossible to implement. In this paper, a forest-management spatial decision-support systems is presented, in which spatial formulation needed for wildlife models is included during the optimization process. To this end, a multiple-objective genetic algorithm is combined with a geographical information system. An online spatial evaluation of the objective functions is made possible. This is illustrated by a pilot study in Kirkhill forest, Aberdeen. Copyright Taylor & Francis Numéro de notice : A2006-351 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE Nature : Article DOI : 10.1080/13658810600711287 En ligne : https://doi.org/10.1080/13658810600711287 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28075 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06081	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06082	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Relationship between herbicide concentration during the 1960s and 1970s and the contemporary MERIS terrestrial chlorophyll index (MTCI) for southern Vietnam / J. Dash in International journal of geographical information science IJGIS, vol 20 n° 8 (september 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 8 (september 2006) . - pp 929 - 939 Titre : Relationship between herbicide concentration during the 1960s and 1970s and the contemporary MERIS terrestrial chlorophyll index (MTCI) for southern Vietnam Type de document : Article/Communication Auteurs : J. Dash, Auteur ; P.J. Curran, Auteur Année de publication : 2006 Article en page(s) : pp 929 - 939 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] chlorophylle [Termes IGN] flore locale [Termes IGN] image Envisat-MERIS [Termes IGN] indice de végétation [Termes IGN] pesticide [Termes IGN] Viet Nam Résumé : (Auteur) Large concentrations of herbicide were sprayed onto the forests of southern Vietnam in the 1960s and early 1970s. Over 30 years later, many of these contaminated forests have regained full canopy cover, albeit with reduced chlorophyll content. The European Space Agency produces an operational product for the estimation of terrestrial chlorophyll content over large areas of terrain. This product uses data recorded by the Medium Resolution Imaging Spectrometer (MERIS) on Envisat and is called the MERIS Terrestrial Chlorophyll Index (MTCI). The relationship between historical levels of herbicide contamination and contemporary MTCI was strong (R = 0.86) and negative, with high levels of herbicide contamination being associated (via low levels of chlorophyll concentration) with low levels of MTCI. This is the first published study to demonstrate a relationship between MTCI and a surrogate for chlorophyll content. The next stage of this research is to build on the strength of this relationship and use contemporary MTCI to estimate historical herbicide levels during the 1960s and 1970s across southern Vietnam. Copyright Taylor & Francis Numéro de notice : A2006-352 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810600816805 En ligne : https://doi.org/10.1080/13658810600816805 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28076 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06081	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06082	RAB	Revue	Centre de documentation	En réserve L003	Disponible