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Lesson Navigation IconFundamental spatial concepts

Unit Navigation IconThe Scale

Unit Navigation IconGeoreferencing: Positioning and Projections

Unit Navigation IconSpatial Relations

LO Navigation IconDistance

LO Navigation IconNeighborhood

LO Navigation IconSpatial relations between thematic properties

Unit Navigation IconTopology, fundamental concept

Unit Navigation IconSpatial Distance and Properties of the Environment

Unit Navigation IconGlossary

Unit Navigation IconBibliography

Unit Navigation IconMetadata


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Spatial relations between thematic properties

Other situations depend on the relation between elements and the phenomena under consideration. The relation is not constant; it's a function of distance. This corresponds to phenomena which move in space having an origin and a destination and disperse progressively in the geographic space such as noise or a cloud of smoke. In addition to the modeling of phenomena, GIS are applied to define the limits of proximity or neighborhood as well as to classify neighborhood. When does an object belong to another object's neighborhood? The answer to this question depends on the interpreter. The concept of neighborhood depends on the object of interest.

Les modèles d'atténuationLes modèles d'atténuation

A spatial relation identifies all the properties between the spatial units. The spatial relation is always related to the concept of neighborhood or of liaison, which makes two phenomena depending on each other. Hence they are expressed by the geometry in the case of neighborhood or by liason functionally expressed in an attribute.
The concept of neighborhood is discussed in the unit "Topological Relations". The concept of topology is discussed in the next unit.

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