Web-based analytical tools for the exploration of spatial data

Luc Anselin, Yong Wook Kim, Ibnu Syabri

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)197-218
Number of pages22
JournalJournal of Geographical Systems
Issue number2
StatePublished - Jun 2004


  • Exploratory spatial data analysis
  • Geotools
  • Internet GIS
  • Smoothing
  • Spatial autocorrelation
  • Spatial outliers

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Economics and Econometrics


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