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Lesson Navigation IconFundamental spatial concepts

Unit Navigation IconThe Scale

Unit Navigation IconGeoreferencing: Positioning and Projections

Unit Navigation IconSpatial Relations

Unit Navigation IconTopology, fundamental concept

LO Navigation IconTopological relations

LO Navigation IconAdjacency

LO Navigation IconConnectivity

LO Navigation IconInclusion

LO Navigation IconIntersection

LO Navigation IconMultiple-choice test

Unit Navigation IconSpatial Distance and Properties of the Environment

Unit Navigation IconGlossary

Unit Navigation IconBibliography

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Adjacency

The concept of adjacency implies that the spatial elements share a side or a boundary. The adjacency is called strict if there is a boundary line in common; the adjacency is called broad if there is a vertex in common (cf. illustration above). It answers the following question: "What is next to what?"
However, the topology provides nuances in the concept of adjacency. It takes into account only the order in which the spatial elements are located away from the target device.
If the two objects are in contact, the adjacency is said to be of first order. If there is another object lying in between, it is called to be of second order etc. (cf. illustration below). The order of adjacency is of interest, for example in transportation to determine the number of transshipments required to move goods or people from one place to another.

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