contiguity
See Also: polygon-arc topology
[data analysis] In a coverage, the topological identification of adjacent polygons by recording the left and right polygon for each arc.
Contiguity The topographical identification of adjacent polygons by recording the left and right polygons of each arc.
Contiguity Measures
Contiguity measures evaluate the characteristics of spatial units that are connected. These units share one or more characteristics with adjacent units and form a group. The term UNBROKEN is the key concept.
contiguity
In a coverage, the topological identification of adjacent polygons by recording the left and right polygon for each arc.
Connectivity and contiguity are implemented through topology: the link-node structure for connectivity through networks and the arc-polygon structure for contiguity.
left-right topology The topological data structure ArcInfo uses to represent contiguity between polygons. Left-right supports analysis functions such as adjacency. See also topology. legend 1.
There are four traditional types of spatial analysis: topological overlay and contiguity analysis, surface analysis, linear analysis, and raster analysis.
Topology, derived from geometrical mathematics, is concerned with order, contiguity and relative position rather than with actual linear dimensions. A good illustration of a topological map is that of the London Underground metro system.
In addition to the initial value, position, contiguity, and size of features, shape characteristics also can be used as the basis for reclassifying map categories.
* What are the spatial factors (e.g. contiguity, patch size, edge, etc.) most influencing change ? How do they influence change?
* Are the activities of the agricultural parastatals (e.g. Sodifitex, Sodagri) accelerating the rate of change?
Geary's C is also known as Geary's Contiguity Ratio, Geary's Ratio, or the Geary Index.
This statistic was developed by Roy C. Geary.[1]
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Adjacency - A topological relationship that occurs when neighboring polygons share a common boundary. Adjacency is sometimes referred to as contiguity. There are two other topological relationships, namely: containment and connectivity.
The coverage model enforces three topological relationships with its data structures:
Connectivity
Area definition
Contiguity ...
Spatial analysis is useful for evaluating suitability and capability, for estimating and predicting, and for interpreting and understanding. There are four traditional types of spatial analysis: topological overlay and contiguity analysis, ...
Example of Topological Relationships (Foote and Huebner/Geographer's Craft) -- Nodes, arcs, polygons, contiguity.
 See also: Analysis, Cover, GIS, Information, Relation
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