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Spatial autoregressive model for population estimation at the census block level using lidar-derived building volume information / F. Qiu in Cartography and Geographic Information Science, vol 37 n° 3 (July 2010)  

Public [article]  inCartography and Geographic Information Science > vol 37 n° 3 (July 2010) . - pp 239 - 257 Titre : Spatial autoregressive model for population estimation at the census block level using lidar-derived building volume information Type de document : Article/Communication Auteurs : F. Qiu, Auteur ; H. Sridharan, Auteur ; Y. Chun, Auteur Année de publication : 2010 Article en page(s) : pp 239 - 257 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] auto-régression [Termes IGN] bati [Termes IGN] densité de population [Termes IGN] données lidar [Termes IGN] recensement démographique Résumé : (Auteur) The collection of population by census is laborious, time consuming and expensive, and often only available at limited temporal and spatial scales. Remote sensing based population estimation has been employed as a viable alternative for providing population estimates based on indicators that make use of two-dimensional areal information of buildings or one-dimensional length information of roads The recent advancement of LIDAR remote sensing provides the opportunity to add the third dimension of height information into the modeling of population distribution. This study explores the use of building volumes derived from LIDAR as a population indicator. Our study shows the volume-based model consistently outperforms area and length-based models at the census block level. Additionally, the study examines the impact of spatial autocorrelation, the presence of which violates the independence assumption of the traditional OLS models. To address this problem, a spatial autoregressive model is employed to account for the spatial autocorrelation in the regression residuals. By incorporating the spatial pattern, the volume-based spatial error model achieves a goodness of fit (R2) of 85 percent, with a significant improvement in model performance and estimation accuracies in comparison with its OLS counterpart. The study confirms building volume as a more valuable indicator and estimator for block level population distribution, especially if an appropriate spatial autoregressive model is adopted. Numéro de notice : A2010-358 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1559/152304010792194949 En ligne : https://doi.org/10.1559/152304010792194949 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30552 [article]

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Visualizing migration flows using kriskograms / N. Xiao in Cartography and Geographic Information Science, vol 36 n° 2 (April 2009)  

Public [article]  inCartography and Geographic Information Science > vol 36 n° 2 (April 2009) . - pp 183 - 191 Titre : Visualizing migration flows using kriskograms Type de document : Article/Communication Auteurs : N. Xiao, Auteur ; Y. Chun, Auteur Année de publication : 2009 Article en page(s) : pp 183 - 191 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique [Termes IGN] carte thématique [Termes IGN] flux [Termes IGN] migration humaine Résumé : (Auteur) This paper describes a new approach called kriskogram to visualizing migration flows. To create a kriskogram, geographical units are projected as a set of points on a straight line segment called a location line. The migration flow between two points on the location line is represented using a half-circle drawn from the origin to the destination in a clockwise direction. Translucent symbols and a classification scheme can be used to make a kriskogram more effective. We demonstrate this method using a set of interstate migration data of four time periods for the conterminous United States. Copyright CaGISociety Numéro de notice : A2009-165 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304009788188763 En ligne : https://doi.org/10.1559/152304009788188763 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29795 [article]

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