Although the notion of spatial interaction plays a central role in the definition of contemporary geography, it is extremely difficult to define, so various are the definitions that have been proposed for it. An attempt may however be made to make a rough classification of these definitions in order to distinguish between what constitutes the heart of the notion, and what points to extensions of it and the theoretical issues it raises.
1. The spatial interaction and gravity model.A (...)
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spatial autocorrelation
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Spatial interaction
3 December 2004, by Cl. G. 
Spatial statistics
6 August 2004, by L. S.Taken in its broadest methodological meaning, this term designates any analysis using the statistical tool and presenting a spatial dimension, whether this dimension concerns the tool itself, the object of analysis or variables used as descriptors of this object. Various combinations are indeed possible: only the object is spatial: the focus is set on localised spatial entities (regions, cities, municipalities, plots) but this location does not play an " active " role in statistical (...)

Neighbourhood
26 August 2004, by D. P.The term neighbourhood is used for everything that is close, nearby, contiguous. Distance as measure of separation, of interval between two places may not be dissociated from the definition of a neighbourhood. The neighbourhood reaches its limit point (immediate neighbourhood) when the spatial units are contiguous, adjoining. A neighbourhood is always expressed into a metric space. The measure of topological relations may be used to express contiguities between objects or places which are (...)