> For the complete documentation index, see [llms.txt](https://docs.os.uk/osngd/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/osngd/using-os-ngd-data/os-ngd-land-use/understanding-land-use-in-the-os-ngd.md).

# Understanding land use in the OS NGD

This guide provides a detailed overview of how land use data is represented in OS NGD and includes the following topics: 

* How OS represents human activity or the economic function of an area or piece of land
* How OS Land Use Tier A and Tier B classifications are assigned and maintained
* How Sites relate spatially to surrounding features
* How address records are matched and summarised 
* How Site Description values map across to National Land Use Database (NLUD) values
* How OS Land Use Tier A and Tier B classifications map across to one another
* How Site Description values map across to OS Land Use Tier A and Tier B classifications
* Which Sites have populated Status attribute values

### Index

* [What is land use in the OS NGD?](/osngd/using-os-ngd-data/os-ngd-land-use/understanding-land-use-in-the-os-ngd/what-is-land-use-in-os-ngd.md)
* [Land use classifications](/osngd/using-os-ngd-data/os-ngd-land-use/understanding-land-use-in-the-os-ngd/land-use-classifications.md)
* [Address data in land use](/osngd/using-os-ngd-data/os-ngd-land-use/understanding-land-use-in-the-os-ngd/address-data-in-land-use.md)
* [Mapping from Site description values to NLUD value](/osngd/using-os-ngd-data/os-ngd-land-use/understanding-land-use-in-the-os-ngd/mapping-from-site-description-values-to-nlud-values.md)
* [Hierarchy of land use classification values in the OS NGD](/osngd/using-os-ngd-data/os-ngd-land-use/understanding-land-use-in-the-os-ngd/hierarchy-of-land-use-classification-values-in-the-os-ngd.md)
* [Land use Sites with populated Status attribute values](/osngd/using-os-ngd-data/os-ngd-land-use/understanding-land-use-in-the-os-ngd/land-use-sites-with-populated-status-attribute-values.md)


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