# Vector tiles

Boundary-Line is supplied as a national vector tiles set in a single MBTiles file (combined from individual PBF tiles). This is a lightweight set of tiles that are efficient to render in supported software, provide high-resolution data and give a seamless experience when zooming in and out. The data is supplied in Web Mercator projection (ESPG:3857).

## Vector tiles schema <a href="#id-7.1-vector-tiles-schema" id="id-7.1-vector-tiles-schema"></a>

The vector tiles schema is detailed in the following page.&#x20;

{% hint style="info" %}
All layers and their attributes are mapped within zoom levels 9 to 14, but not within zoom levels 0 to 8
{% endhint %}

### Boundary-Line ceremonial counties

* **Layer Name**: Boundary\_line\_ceremonial\_counties
* **Attribute Name**:&#x20;
  * name

### Boundary-Line historic counties

* **Layer Name**: Boundary\_line\_historic\_counties
* **Attribute Name**:&#x20;
  * name

### Community ward&#x20;

* **Layer Name**: community\_ward&#x20;
* **Attribute Names**:&#x20;
  * name
  * community

### County&#x20;

* **Layer Name**: county&#x20;
* **Attribute Names**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id&#x20;
  * census\_code&#x20;
  * hectares&#x20;
  * non\_inland\_area&#x20;
  * area\_type\_code

### County electoral division&#x20;

* **Layer Name**: county\_electoral\_division&#x20;
* **Attribute Name**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id&#x20;
  * census\_code&#x20;
  * hectares&#x20;
  * non\_inland\_area&#x20;
  * area\_type\_code

### Country region

* **Layer Name**: country\_region
* **Attribute Names**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id
  * census\_code&#x20;
  * hectares&#x20;
  * non\_inland\_area&#x20;
  * area\_type\_code

### District borough unitary

* **Layer Name**: district\_borough\_unitary
* **Attribute Names**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id&#x20;
  * census\_code&#x20;
  * hectares&#x20;
  * non\_inland\_area&#x20;
  * area\_type\_code

### District borough unitary ward

* **Layer Name**: district\_borough\_unitary\_ward
* **Attribute Names**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id&#x20;
  * census\_code&#x20;
  * hectares&#x20;
  * non\_inland\_area&#x20;
  * area\_type\_code

### English region

* **Layer Name**: english\_region
* **Attribute Names**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id&#x20;
  * census\_code&#x20;
  * hectares&#x20;
  * non\_inland\_area&#x20;
  * area\_type\_code

### Greater London const

* **Layer Name**: greater\_london\_const
* **Attribute Names**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id&#x20;
  * census\_code&#x20;
  * hectares
  * non\_inland\_area&#x20;
  * area\_type\_code

### High water

* **Layer Name**: high\_water
* **Attribute Names**:&#x20;
  * file\_name&#x20;
  * global\_link\_id

### Historic European region

* **Layer Name**: historic\_european\_region
* **Attribute Name**:&#x20;
  * name

### Parish

* **Layer Name**: parish
* **Attribute Names**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id&#x20;
  * census\_code&#x20;
  * hectares&#x20;
  * non\_inland\_area&#x20;
  * area\_type\_code

### Polling districts England

* **Layer Name**: polling\_districts\_england
* **Attribute Names**:&#x20;
  * pd\_id&#x20;
  * county&#x20;
  * district\_borough&#x20;
  * ward&#x20;
  * parish

### Scotland and Wales const

* **Layer Name**: scotland\_and\_wales\_const
* **Attribute Names**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id&#x20;
  * census\_code&#x20;
  * hectares&#x20;
  * non\_inland\_area&#x20;
  * area\_type\_code

### Scotland and Wales region

* **Layer Name**: scotland\_and\_wales\_region
* **Attribute Names**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id&#x20;
  * census\_code&#x20;
  * hectares&#x20;
  * non\_inland\_area&#x20;
  * area\_type\_code

### Unitary electoral division

* **Layer Name**: unitary\_electoral\_division
* **Attribute Names**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id&#x20;
  * census\_code&#x20;
  * hectares&#x20;
  * non\_inland\_area&#x20;
  * area\_type\_code

### Westminster const

* **Layer Name**: westminster\_const
* **Attribute Names**:&#x20;
  * name
  * area\_code&#x20;
  * global\_polygon\_id&#x20;
  * census\_code&#x20;
  * hectares&#x20;
  * non\_inland\_area&#x20;
  * area\_type\_code


---

# 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/areas-and-zones-portfolio/boundary-line/boundary-line-technical-specification/vector-tiles.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.