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Local weighted linear combination / J. Malczewski in Transactions in GIS, vol 15 n° 4 (August 2011)  

Public [article]  inTransactions in GIS > vol 15 n° 4 (August 2011) . - pp 439 - 455 Titre : Local weighted linear combination Type de document : Article/Communication Auteurs : J. Malczewski, Auteur Année de publication : 2011 Article en page(s) : pp 439 - 455 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse multicritère [Termes IGN] analyse spatiale [Termes IGN] classification barycentrique [Termes IGN] combinaison linéaire ponderée [Termes IGN] système d'information géographique [Termes IGN] voisinage (relation topologique) Résumé : (Auteur) The article focuses on one of the most often used GIS-based multicriteria analysis methods: the weighted linear combination (WLC). The WLC model has traditionally been used as a global approach based on the implicit assumption that its parameters do not vary as a function of geographical space. This assumption is often unrealistic in real-world situations. The article proposes a new approach to GIS-based multicriteria analysis. It develops a local form of the global WLC model. The range sensitivity principle is used as a central concept for developing the local WLC model. The principle postulates that the greater the range of criterion values is, the greater the weight assigned to that criterion should be. Consequently, the local criterion weight can be defined for each neighborhood within a study area as a function of the range of criterion values in a given neighborhood. The range of criterion values provides also the base for defining the local value function. The article presents the theory behind the local WLC modeling and illustrates an implementation of the model in a GIS environment. Numéro de notice : A2011-345 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01275.x Date de publication en ligne : 16/08/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01275.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31124 [article]

Street-level spatial interpolation using network-based IDW and ordinary kriging / N. Shiode in Transactions in GIS, vol 15 n° 4 (August 2011)  

Public [article]  inTransactions in GIS > vol 15 n° 4 (August 2011) . - pp 457 - 477 Titre : Street-level spatial interpolation using network-based IDW and ordinary kriging Type de document : Article/Communication Auteurs : N. Shiode, Auteur ; S. Shiode, Auteur Année de publication : 2011 Article en page(s) : pp 457 - 477 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] interpolation inversement proportionnelle à la distance [Termes IGN] interpolation spatiale [Termes IGN] krigeage [Termes IGN] lissage de données [Termes IGN] réseau routier Résumé : (Auteur) This study proposes network-based spatial interpolation methods to help predict unknown spatial values along networks more accurately. It expands on two of the commonly used spatial interpolation methods, IDW (inverse distance weighting) and OK (ordinary kriging), and applies them to analyze spatial data observed on a network. The study first provides the methodological framework, and it then examines the validity of the proposed methods by cross-validating elevations from two contrasting patterns of street network and comparing the MSEs (Mean Squared Errors) of the predicted values measured with the two proposed network-based methods and their conventional counterparts. The study suggests that both network-based IDW and network-based OK are generally more accurate than their existing counterparts, with network-based OK constantly outperforming the other methods. The network-based methods also turn out to be more sensitive to the edge effect, and their performance improves after edge correction. Furthermore, the MSEs of standard OK and network-based OK improve as more sample locations are used, whereas those of standard IDW and network-based IDW remain stable regardless of the number of sample locations. The two network-based methods use a similar set of sample locations, and their performance is inherently affected by the difference in their weight distribution among sample locations. Numéro de notice : A2011-346 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01278.x Date de publication en ligne : 16/08/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01278.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31125 [article]

The development of a web-based demographic data extraction tool for population monitoring / T. Chow in Transactions in GIS, vol 15 n° 4 (August 2011)  

Public [article]  inTransactions in GIS > vol 15 n° 4 (August 2011) . - pp 479 - 494 Titre : The development of a web-based demographic data extraction tool for population monitoring Type de document : Article/Communication Auteurs : T. Chow, Auteur ; Y. Lin, Auteur ; W. Chan, Auteur Année de publication : 2011 Article en page(s) : pp 479 - 494 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] base de données d'adresses [Termes IGN] données démographiques [Termes IGN] exploration de données géographiques [Termes IGN] extraction de données [Termes IGN] outil de découverte de connaissances [Termes IGN] population [Termes IGN] Texas (Etats-Unis) Résumé : (Auteur) The Internet contains a great wealth of information available online. People search engines, such as WhitePages (http://www.whitepages.com), gather personal-level demographic data, including full name, address, age and household members. Requiring only a surname and locational reference (e.g. city or postal code) as the minimum search criteria, such people search engines can be perceived as a gigantic database of demographic records. The objective of this article is to outline the development of a web-based demographic data extraction tool for population monitoring. In this study, a web prototype was developed to extract web demographics of the Vietnamese-American (VA) population in Texas, an ethnic minority with unique migration history, from WhitePages. After post-processing, the personal-level demographic data represent 40.3% of 202,003 VA in Texas reported by the American Community Survey (ACS) 2009. While all enumeration strategies, the web approach included, have their own strengths and weaknesses, this study suggests an alternative approach that is complementary to existing enumeration strategies. More research and development are needed to validate the accuracy of web demographics and further enhance data navigation and extraction rules. The utilization and release of web demographics must be cautious with regards to privacy and integrity of personal identity. Numéro de notice : A2011-347 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01274.x Date de publication en ligne : 16/08/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01274.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31126 [article]

Interpolating spatial interaction data / W. Jang in Transactions in GIS, vol 15 n° 4 (August 2011)  

Public [article]  inTransactions in GIS > vol 15 n° 4 (August 2011) . - pp 541 - 555 Titre : Interpolating spatial interaction data Type de document : Article/Communication Auteurs : W. Jang, Auteur ; X. Yao, Auteur Année de publication : 2011 Article en page(s) : pp 541 - 555 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] commutateur [Termes IGN] données localisées [Termes IGN] flux de données [Termes IGN] Géorgie (Etats-Unis) [Termes IGN] interpolation linéaire [Termes IGN] interpolation spatiale Résumé : (Auteur) Spatial interpolation has been widely used to improve the spatial granularity of data, or to mediate between inconsistent zoning schemes of spatial data. Traditional areal interpolation methods translate values of source zones to those of target zones. These methods have difficulty in dealing with flow data, as each instance is associated with a pair of zones. This study develops a new concept, flow line interpolation, to fill the abovementioned gap. We also develop a first flow line interpolation method to estimate commuting flow data between spatial units in a target zoning scheme based on such data in a source zoning scheme. Three models (i.e., areal-weighted, intelligent, and gravity-type flow line interpolation) are presented. To test the estimation accuracy and the application potential of these models, a case study of Fulton County in Georgia is conducted. The results reveal that both the areal-weighted and intelligent models are very promising flow line interpolation methods. Numéro de notice : A2011-348 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01273.x Date de publication en ligne : 16/08/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01273.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31127 [article]