Journal of Geographical Systems

, Volume 6, Issue 2, pp 197–218

Web-based analytical tools for the exploration of spatial data


DOI: 10.1007/s10109-004-0132-5

Cite this article as:
Anselin, L., Kim, Y. & Syabri, I. J Geograph Syst (2004) 6: 197. doi:10.1007/s10109-004-0132-5


This paper deals with the extension of internet-based geographic information systems with functionality for exploratory spatial data analysis (esda). The specific focus is on methods to identify and visualize outliers in maps for rates or proportions. Three sets of methods are included: extreme value maps, smoothed rate maps and the Moran scatterplot. The implementation is carried out by means of a collection of Java classes to extend the Geotools open source mapping software toolkit. The web based spatial analysis tools are illustrated with applications to the study of homicide rates and cancer rates in U.S. counties.

Key words

internet GISexploratory spatial data analysisspatial outlierssmoothingspatial autocorrelationGeotools

Copyright information

© Springer-Verlag Berlin Heidelberg 2004

Authors and Affiliations

  1. 1.Spatial Analysis LaboratoryDepartment of Agricultural and Consumer EconomicsUSA