Spatial Analyst is an extension for ArcGIS that includes tools for raster-based (cell-based) spatial modeling and analysis.
ArcGIS Spatial Analyst software may be found at:
Here you will find a four-minute video of ArcGIS Spatial Analyst (http://www.esri.com/software/arcgis/extensions/spatialanalyst/demos.html) and much more additional information on the analytical functions available within this extension.
Note: Geographically Weighted Regression (GWR) was introduced with ArcGIS 9.3 and is available in the Spatial Statistics Toolbox with ArcInfo, ArcGIS Spatial Analyst, or ArcGIS Geostatistical Analyst.
For additional documentation for ArcGIS Spatial Analyst, visit
Erdey-Heydorn, M. 2008. An ArcGIS Seabed Characterization Toolbox Developed for Investigating Benthic Habitats. Marine Geodesy 31(4): 318–358.
Fall, S., D. Niyogi, and F.H.M. Semazzi. 2006. Analysis of Mean Climate Conditions in Senegal (1971–1998). Earth Interactions 10(5): 1–40.
Rejith, P.G., S.P. Jeeva, H. Vijith, M. Sowmya, and A.A. Hatha. 2009. Determination of Groundwater Quality Index of a Highland Village of Kerala (India) Using Geographical Information System. Journal of Environmental Health 71(10): 51–8.
For technical articles, visit http://support.esri.com/index.cfm?fa=knowledgebase.techarticles.browseFilter&p=43&pf=554