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Lesson Navigation IconSpatial Queries

Unit Navigation IconIntroduction to spatial queries

Unit Navigation IconThematic query

Unit Navigation IconGeometric query

LO Navigation IconThe geometric primitives

LO Navigation IconGeometric measurement functions

Unit Navigation IconTopological query

Unit Navigation IconSummary

Unit Navigation IconGlossary

Unit Navigation IconBibliography

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Geometric query

In addition to the information and search options based on theme, analysis functions based on spatial (geometric and topological) selection criteria are also implemented in GIS. In this unit, the geometric query is discussed. The geometry can be measured, such as the area or the perimeter of an object, or the distance or direction between two objects, respectively (measuring functions). To explain these concepts, it is important to distinguish between raster and vector models.

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