# Data ordering and currency

To get access to the OS NGD you must first log into the [OS Data Hub](https://osdatahub.os.uk/). The OS NGD is accessible via both the [Premium Plan and Public Sector Plan on the OS Data Hub](https://osdatahub.os.uk/plans).

## Geographic filtering

There are three options within OS Select+Build (the OS NGD download service) in relation to the geographic extent of your order. These are:

* **Great Britain**: Receive all data for the whole of Great Britain.
* **Customer Specified Area**: Draw an area of interest (AOI) and only receive the data which intersects this area.
* **Pre-defined Area**: Select a pre-defined area, and only receive the data which intersects this area.

{% hint style="info" %}

## Exceptions

* Exceptions to the geographic filtering bullets above include:
  * The OS Islands Address Collection – This collection contains data for Northern Ireland, the Isle of Man, and the Channel Islands, and it will be provided as a full supply of data independent of any geographic filtering applied to your OS NGD recipe.
  * The OS NI Postcodes Collection – This collection contains data for Northern Ireland and it will be provided as a full supply of data independent of any geographic filtering applied to your OS NGD recipe.
* COU Supplies are not available for AOIs, monthly Full Supplies are available for AOIs.
  {% endhint %}

## Order update options

When accessing the OS NGD, the following order update options will be available:

* One Off Full Supply
* Regular Full Supply
* Change-Only Update (COU; after an initial Full Supply)
* No Update

The following frequencies will be available dependent on the type of order you place:

* **Daily Supply**: This will provide you with the latest updates OS have loaded and verified for publication since the previous day as a COU file.
* **Monthly Supply:** Either a Full Supply or COU Supply of all the changes which have occurred in the previous month.
* **Annual Supply**: A Full Supply of the data to show how the data looked at the end of each year.

Further details about the options available to you can be found further down on this page.

{% hint style="info" %}

## Please note

* Monthly orders provide data for the first of the month. For example, if you ordered a Monthly Supply on 20 September 2025, you would receive the data as it was on 01 September 2025.
* If you select an Annual Full Supply frequency for your OS NGD data order in OS Select+Build, we will provide you with the data as it was on 01 January of the current year. This means if a new feature type or a new data schema version of an existing feature type was released after 01 January and you order either of these as part of your Annual Full Supply, you will receive an **empty data package** for the newly released feature type / new data schema version of an existing feature type. The data for the new feature type / new data schema version of an existing feature type will then be included in your supply on the next 01 January after the release.
  * For example, the March 2026 OS NGD data enhancements release contained six new feature types (Retail Area Aggregated, Retail Area Major, Retail Area Minor, Postcode Unit Point, Postcode Unit Point, and Postcode Unit Area) and one new data schema version for an existing feature type (Compound Structure v3.0). As per the bullet above, the data for the new feature types and the new data schema version for the existing feature type will not be part of Annual Full Supply orders until 01 January 2027.
    {% endhint %}

### Update files

If you choose to receive a COU supply for your CSV data, this can be provided on either a daily or monthly frequency. In both cases, your COU file will contain any changes which have been made to the underlying data within the selected time frequency. If no changes have been made to a selected feature type of your choice, then you will receive a blank COU file.

### File supply

If you use OS Select+Build to access the OS NGD, then a separate download file will be provided for each feature type you order. For example, if your selected theme has two feature types you will be supplied with two separate files (CSV or GeoPackage) as part of your order.

### Ordering combinations

The following tables summarise the different options available to you dependent on what you specify when ordering your data through OS Select+Build.

For the purposes of the tables below, the following definitions are being used:

* Unfiltered means a Great Britain supply with no further attribute filters applied.
* Filtered means an order for data which either has a geographic filter applied or an attribute filter applied.

#### GPKG files

<table><thead><tr><th width="277">Initial Supply</th><th width="471">Update Options</th></tr></thead><tbody><tr><td>Daily (filtered / unfiltered)</td><td>N/A</td></tr><tr><td>Monthly (filtered / unfiltered)</td><td>Monthly Full Supply</td></tr><tr><td>Annual (filtered / unfiltered)</td><td>Annual Full Resupply with data from 01 January</td></tr></tbody></table>

{% hint style="info" %}
Please note that COU supplies are only available for CSV files; they are not available for GeoPackage files.
{% endhint %}

#### CSV files

<table><thead><tr><th width="274">Initial Supply</th><th>Update Options</th></tr></thead><tbody><tr><td>Daily (filtered)</td><td>N/A</td></tr><tr><td>Daily (unfiltered)</td><td>Daily COU</td></tr><tr><td>Monthly (filtered)</td><td>Monthly Full Supply</td></tr><tr><td>Monthly (unfiltered)</td><td>Monthly COU or Monthly Full Supply</td></tr><tr><td>Annual (filtered / unfiltered)</td><td>Annual Full Resupply with data from 01 January</td></tr></tbody></table>

{% hint style="info" %}
You can use the [OS Downloads API](https://osdatahub.os.uk/docs/downloads/overview) to manage your daily / monthly COU supply of OS NGD data.
{% endhint %}

### Order Summary File

Feature types downloaded via OS Select+Build will be supplied with an Order Summary File, a small JSON manifest that provides key metadata about the supplied file. You can use this file to validate the data to ensure the currency, record count, schema version, feature name and coordinate reference system (CRS) match your expected order.

The following file naming convention will be applied to each Order Summary File you receive:

* collection\_featuretype\_orderSummary.json

For example, the file name for the Building Part Feature Type Order Summary File would look like this:

* bld\_fts\_buildingline\_orderSummary.json

The example below shows the information an Order Summary File contains:

```json
{
 "featureName": "bld-fts-buildingline",
 "crs": "http://www.opengis.net/def/crs/EPSG/0/27700",
 "schemaVersion": "1.0",
 "validFromDate": null,
 "validToDate": "2023-03-01",
 "recordCount": 202653
}
```

The following table provides a brief description of each field:

| Field         | Description                                              | Use                                                                                                                             |
| ------------- | -------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------- |
| featureName   | The feature type delivered in this order.                | Validate the downloaded feature against your recipe.                                                                            |
| crs           | The coordinate reference system used for your supply.    | Validate the coordinate reference system against the CRS selected for your recipe.                                              |
| schemaVersion | The OS NGD data schema version provided for the feature. | Coordinate data schema updates with changes to your data.                                                                       |
| validFromDate | The start date of coverage for this supply.              | Validate the currency of your data to ensure the earliest date aligns with the expected supply window for your order frequency. |
| validToDate   | The end date of coverage for this supply.                | Validate the currency of your data to ensure the latest date aligns with the expected supply window for your order frequency.   |
| recordCount   | The total number of records delivered in the file.       | Check that delivered entries match the number of records expected for your download.                                            |

## Currency of OS NGD data

### OS Select+Build and OS NGD API – Features

Whether accessing OS NGD data through OS Select+Build or OS NGD API – Features, the following currency of the data will apply:

| Theme                                       | Collection                                                                | Update Frequency                                                          |
| ------------------------------------------- | ------------------------------------------------------------------------- | ------------------------------------------------------------------------- |
| <p>OS NGD Address <br></p>                  | OS GB Address (\*N.B. Not available in OS NGD API – Features)             | Daily                                                                     |
|                                             | OS Islands Address (\*N.B. Not available in OS NGD API – Features)        | Daily                                                                     |
| OS NGD Administrative and Statistical Units | OS Boundaries (\*N.B. Not available in OS NGD API – Features)             | Biannual                                                                  |
|                                             | :new: OS Functional Areas (\*N.B. Not available in OS NGD API – Features) | Biannual                                                                  |
|                                             | :new: OS GB Postcodes                                                     | Monthly                                                                   |
|                                             | :new: OS NI Postcodes (\*N.B. Not available in OS NGD API – Features)     | Monthly                                                                   |
| OS NGD Buildings                            | OS Buildings Features                                                     | Daily                                                                     |
| OS NGD Geographical Names                   | OS Named Features                                                         | Daily                                                                     |
| OS NGD Land                                 | OS Land Features                                                          | Daily                                                                     |
| OS NGD Land Use                             | OS Land Use Features                                                      | Daily                                                                     |
| OS NGD Structures                           | OS Structure Features                                                     | Daily                                                                     |
| OS NGD Transport                            | OS Transport Features                                                     | Daily (apart from the Street Light Feature Type which is updated monthly) |
|                                             | OS Transport Network                                                      | Monthly                                                                   |
|                                             | OS RAMI                                                                   | Monthly                                                                   |
| OS NGD Water                                | OS Water Features                                                         | Daily                                                                     |
|                                             | OS Water Network                                                          | Quarterly                                                                 |

{% hint style="info" %}
\*Please see the ['What data is available' (for OS NGD API – Features)](https://docs.os.uk/osngd/getting-started/access-the-os-ngd-api/os-ngd-api-features/what-data-is-available) page for more information on what features are available in this API.
{% endhint %}

For collections that are not updated daily, the table below provides the date of the last update; it also shows the version of the OS MasterMap product to which the OS NGD data corresponds, if applicable:

<table><thead><tr><th width="254">Collection</th><th width="167.33333333333331">Last Updated</th><th>Corresponding OS MasterMap Product</th></tr></thead><tbody><tr><td>OS Boundaries </td><td>16 October 2025</td><td><p>Boundary-Line – </p><p>October 2025 publication</p></td></tr><tr><td>OS Functional Areas</td><td>26 March 2026</td><td>N/A</td></tr><tr><td>OS GB Postcodes</td><td>17 March 2026</td><td>N/A</td></tr><tr><td>OS NI Postcodes</td><td>17 March 2026</td><td>N/A</td></tr><tr><td>OS RAMI</td><td>06 March 2026</td><td>OS MasterMap Highways Network – March 2026 publication</td></tr><tr><td>OS Transport Features – Street Light Feature Type only</td><td>06 March 2026</td><td>N/A</td></tr><tr><td>OS Transport Network</td><td>06 March 2026</td><td>OS MasterMap Highways Network – March 2026 publication</td></tr><tr><td>OS Water Network</td><td>28 January 2026</td><td>OS MasterMap Water Network – January 2026 publication</td></tr></tbody></table>

### OS NGD API – Tiles

When accessing OS NGD data through OS NGD API – Tiles, the data currency is weekly for the basemap and variable for the four data overlays – please see the ['What data is available' (for OS NGD API – Tiles) page](https://docs.os.uk/osngd/getting-started/access-the-os-ngd-api/os-ngd-api-tiles/what-data-is-available) for more information on update frequency, available feature types and available attribution for this API.

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### Please note:

* The OS Functional Areas, OS GB Address, OS Islands Address, and OS NI Postcodes Collections are only available via OS Select+Build and are not available via OS NGD API – Features or OS NGD API – Tiles.
* The OS GB Postcodes and OS Routing and Asset Management Information (RAMI) Collections are only available via OS Select+Build and OS NGD API – Features and are not available via OS NGD API – Tiles.
* The OS Boundaries Collection is only available via OS Select+Build and OS NGD API – Tiles and is not available via OS NGD API – Features.
* The Tidal Boundary Continuous High, Tidal Boundary Continuous Low, River Basin District Catchment and Waterbody Catchment Feature Types (of the OS Water Features Collection) are not available via OS NGD API – Features, but they are available via OS Select+Build and OS NGD API – Tiles.
  {% endhint %}

## Feature counts for the OS NGD Transport Theme

Feature counts are detailed below for the [OS Routing and Asset Management (RAMI)](https://docs.os.uk/osngd/data-structure/transport/rami) and [OS Transport Network](https://docs.os.uk/osngd/data-structure/transport/transport-network) Collections of the [OS NGD Transport Theme](https://docs.os.uk/osngd/data-structure/transport). These feature counts will be updated monthly to reflect data currency for these collections.

<details>

<summary>OS RAMI Collection feature counts for March 2026 (click the arrow to view the table)</summary>

| Feature Type                 | Full Supply Feature Count |
| ---------------------------- | ------------------------- |
| Average And Indicative Speed | 8 570 178                 |
| Highway Dedication           | 4 041 972                 |
| Maintenance Area             | 1 419                     |
| Maintenance Line             | 1 467 435                 |
| Maintenance Point            | 65 840                    |
| Reinstatement Area           | 2 016                     |
| Reinstatement Line           | 1 610 609                 |
| Reinstatement Point          | 132 959                   |
| Restriction                  | 1 101 215                 |
| Routing Hazard               | 43 651                    |
| Routing Structure            | 1 404 192                 |
| Special Designation Area     | 21 949                    |
| Special Designation Line     | 525 642                   |
| Special Designation Point    | 283 456                   |

</details>

<details>

<summary>OS Transport Network Collection feature counts for March 2026 (click the arrow to view the table)</summary>

| Feature Type     | Full Supply Feature Count |
| ---------------- | ------------------------- |
| Bus Lane         | 25 633                    |
| Connecting Link  | 2 015 598                 |
| Connecting Node  | 1 869 425                 |
| Cycle Lane       | 424 576                   |
| Ferry Link       | 223                       |
| Ferry Node       | 340                       |
| Ferry Terminal   | 340                       |
| Path             | 25 414                    |
| Path Link        | 3 385 955                 |
| Path Node        | 3 994 615                 |
| Pavement Link    | 9 363 867                 |
| Railway Link     | 155 733                   |
| Railway Link Set | 154                       |
| Railway Node     | 152 409                   |
| Road             | 858 598                   |
| Road Junction    | 6 884                     |
| Road Link        | 8 570 177                 |
| Road Node        | 7 595 842                 |
| Street           | 1 570 604                 |
| Tram On Road     | 3 246                     |

</details>

{% hint style="info" %}
Please note, feature counts are currently **only provided for two OS NGD collections**: the OS RAMI and OS Transport Network Collections of the OS NGD Transport Theme.
{% endhint %}