> 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-cover-enhancements/summary.md).

# Summary

<table data-header-hidden><thead><tr><th width="213"></th><th></th></tr></thead><tbody><tr><td><strong>Theme​</strong> </td><td>Land, Structures, Transport, Water ​[1]</td></tr><tr><td><strong>Collections</strong>​ </td><td>OS Land Features, OS Structure Features, OS Transport Features and OS Water Features Collections </td></tr><tr><td><strong>Feature Types​</strong> </td><td>​Land, Rail, ​Road Track or Path, Structure, Water [1]</td></tr><tr><td><strong>Coverage</strong>​ </td><td>Great Britain​ (‘Excavated or Deposited’, ‘Open Vegetation’, ‘Mineral’, ‘Multiple’, ‘Trees’, ‘Under Construction’ or ‘Water’ [1] topographic area features) [2] [3]</td></tr><tr><td><strong>Geometry</strong>​ </td><td>Polygons​ </td></tr><tr><td><strong>Data Sources​</strong> </td><td>Classification of topographic area features is from existing ground and remote survey methods. Automated classification from OS aerial imagery (25cm) to determine percentage cover value. </td></tr><tr><td><strong>Data Updates​</strong> </td><td>Three-year cyclical revision from OS aerial imagery. Updates are processed up-to-daily into OS NGD. </td></tr><tr><td><strong>Supply Type</strong>​ </td><td>Full supply and Change-Only Update (COU)​. </td></tr><tr><td><strong>Supply Formats​</strong> </td><td><p>GeoPackage or CSV download from OS NGD Select+Build. </p><p>GeoJSON from OS NGD API – Features​. </p></td></tr></tbody></table>

\[1] No percentage value for Water features.&#x20;

\[2] Other features are included in scope where they have a natural land cover, i.e.  areas under construction are included because they are generally sand or bare earth until construction is complete. ‘Constructed’ or ‘Made’ features are out of scope.&#x20;

\[3] Only features above the Mean High Water (Springs) line have a percentage value.&#x20;


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.os.uk/osngd/using-os-ngd-data/os-ngd-land-cover-enhancements/summary.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.