---
title: Spatial concepts
description: Introduces the spatial concept reference and its geometry, dimension, coordinate reference system and format sections.
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The Concepts reference organizes explanations of the spatial model independently
of LongitudeOne APIs and database platforms.

- [Geometries](geometries.md): geometry families, relationships and properties.
- [Dimensions](dimensions.md): coordinate dimensions and coordinate components.
- [Coordinate reference systems](crs.md): spatial referencing and identification.
- [Formats](formats.md): spatial representations and their relationship to the model.