# Buildings and Infrastructure Portfolio

## Buildings and infrastructure products

This portfolio provides information about the built environment. It brings together detailed data on buildings, structures and transport infrastructure to support planning, asset management and emergency response with precision and clarity.

The following downloadable products are available within the Buildings and Infrastructure Portfolio:

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="image">Cover image</th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><h3>OS MasterMap Topography Layer – Building Height Attribute</h3></td><td>An enhancement to OS MasterMap Topography Layer that provides building height properties to manage assets, plan works and visualise urban density.</td><td data-object-fit="cover" data-alt="Example image showing OS MasterMap Topography Layer – Building Height Attribute product data."><a href="https://1897589978-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FcNpJpLP8RROUaWVQo5ea%2Fuploads%2F0r6Sp1CKhq90dfGBabMp%2FMasterMap-Topography-And-Building-Heights-2.PNG?alt=media&#x26;token=ea35a13d-4a5a-441d-ab11-ebb2a4915a5d">MasterMap-Topography-And-Building-Heights-2.PNG</a></td><td><a href="buildings-and-infrastructure-portfolio/os-mastermap-topography-layer-building-height-attribute">os-mastermap-topography-layer-building-height-attribute</a></td></tr><tr><td><h3>OS Open Linked Identifiers</h3></td><td>An open dataset of cross-referenced identifiers detailing relationships between Unique Property Reference Numbers (UPRNs), Unique Street Reference Numbers (USRNs) and Topographic Identifiers (TOIDs).</td><td data-object-fit="cover" data-alt="Example image showing OS Open Linked Identifiers product data over a background map."><a href="https://1897589978-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FcNpJpLP8RROUaWVQo5ea%2Fuploads%2F0bS2LgTUy6nCxRJO59Pk%2FLinkedIDs_banner_small.png?alt=media&#x26;token=261b1132-6a05-4d71-80b1-e5e7671cedd8">LinkedIDs_banner_small.png</a></td><td><a href="buildings-and-infrastructure-portfolio/os-open-linked-identifiers">os-open-linked-identifiers</a></td></tr><tr><td><h3>OS Open TOID</h3></td><td>An open dataset of unique identifiers for landscape and built environment features with a generalised location extracted from OS MasterMap products.</td><td data-object-fit="cover" data-alt="Example image showing OS Open TOID product data over a background map."><a href="https://1897589978-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FcNpJpLP8RROUaWVQo5ea%2Fuploads%2FzqzREBnCTFHoLtSoQIny%2Fopen-toid-data.xdc094ecd%20(1).webp?alt=media&#x26;token=427552bf-c664-4997-be13-a003716e0932">open-toid-data.xdc094ecd (1).webp</a></td><td><a href="buildings-and-infrastructure-portfolio/os-open-toid">os-open-toid</a></td></tr></tbody></table>


---

# Agent Instructions: Querying This Documentation

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

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.os.uk/os-downloads/products/buildings-and-infrastructure-portfolio.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.