Site Access Location

Feature which has a point geometry and represents the locations where pedestrians and / or vehicles can enter or exit a site.

Data schema versioning

The following table provides details about this feature type’s data schema versions, including the reasons behind the changes and the related launch date when each version went live.

Data schema version table

Version ↓	Launch Date	Latest Date	Change
2.0	27 March 2025	Ongoing	Major version increment adding new Access Purpose, Accessed Network Node Feature Type, Accessed Network Node ID, and Distance To Network Node attribution.
1.0	03 October 2022	Ongoing	Initial launch of the Site Access Location Feature Type.

Please see Data schema versioning for in-depth information about data schema versioning in the OS NGD.

Temporal filtering

Temporal filtering allows you to order a one-off snapshot of data from the OS NGD from a current or past date. It is an optional step when you create a new data package in OS Select+Build (the OS NGD download service).

The earliest and latest dates on which you can request a one-off snapshot of a date in the past for this feature type's data schema versions are indicated in the Data schema version table above. Please note that any data temporally filtered earlier than the specified launch date indicated in the table for the data schema versions may contain data inconsistencies.

More information about temporal filtering on OS NGD feature types is available from the Getting started with temporal filtering guide.

Feature type attributes

The following sub-sections provide details about the attributes included with this feature type, their data types in the different output formats, and other important metadata about them.

Loading OS NGD CSV files into databases

Comma-separated values (CSV) file format is universally supported for easy ingestion into all major database products. Before loading OS NGD data contained in CSV files into a database, it is necessary to create relevant tables. Data definition language (DDL) statements for PostgreSQL, SQL Server and Oracle can be accessed in our OS NGD Resources GitHub repository.

For instructions on loading CSV files, see the Getting Started with CSV guide.

osid

Primary identifier for the feature. The OSID is a Globally Unique Identifier (GUID) and requires no centralised authority to ensure uniqueness. Note that the same OSID can occur in more than one feature type when a single feature is represented multiple times in the OS NGD.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Max Length: 36

• OS NGD API – Features Filterable: Yes

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

toid

Topographic identifier (TOID) of the feature, as published in the OS MasterMap suite of products.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: true

• Max Length: 20

• OS NGD API – Features Filterable: Yes

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

versiondate

Date when the version was last updated.

• Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

• Nullable: false

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

versionavailablefromdate

The date this version of the feature became the latest version.

• Data Types: String (GeoJSON), DateTime (GPKG), DateTime (CSV)

• Nullable: false

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

versionavailabletodate

The date this version of the feature was superseded by an update or ceased to exist.

• Data Types: String (GeoJSON), DateTime (GPKG), DateTime (CSV)

• Nullable: true

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

changetype

The type of change that generated a new version of the feature.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Code List Name: changetypevalue
• Max Length: 50

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

description

A single descriptive value intended for a quick understanding of what the feature represents.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Code List Name: siteaccesslocationdescriptionvalue
• Max Length: 15

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

geometry

Geometry for the feature.

• Data Types: Geometry (GeoJSON), Geometry (GPKG), WKT (CSV)

• Nullable: false

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

• Geometry Type: Point

geometry_evidencedate

The date on which the latest evidence was gathered to make an update if required. For example the date of collection by a surveyor or third party information received.

• Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

• Nullable: true

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

🆕 geometry_capturemethod

Indication of the method used to capture or produce the data.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: true

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 2.0

geometry_updatedate

Date when the attribute was last updated.

• Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

• Nullable: false

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

geometry_source

The source organisation who provided the data.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: true

• Max Length: 50

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

theme

The OS NGD theme to which this feature belongs.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Code List Name: themevalue
• Max Length: 40

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

accesstype_source

The organisation that provided the information.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: true

• Max Length: 50

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

🆕 access_mode (formerly accesstype)

This attribute was called accesstype in data schema version 1.0, and was renamed access_mode from version 2.0 onward.

v2.0

A description of the method(s) of access normally utilised at the Site Access Location (for example, Pedestrian).

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Code List Name: accessmodevalue
• Max Length: 25

• OS NGD API – Features Filterable: Yes

• OS Select+Build Filterable: Yes

• Data Schema Version: 2.0

v1.0

This describes the methods of access normally utilised at the SiteAccessLocation.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Code List Name: accesstypevalue
• Max Length: 30

• OS NGD API – Features Filterable: Yes

• OS Select+Build Filterable: Yes

• Data Schema Version: 1.0

🆕 access_purpose

A description of the principal access function at the Site Access Location (for example, Private or Public).

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: true

• Code List Name: accesspurposevalue
• Max Length: 15

• OS NGD API – Features Filterable: Yes

• OS Select+Build Filterable: Yes

• Data Schema Version: 2.0

🆕 access_evidencedate (formerly accesstype_evidencedate)

This attribute was called accesstype_evidencedate in data schema version 1.0, and was renamed access_evidencedate from version 2.0 onward.

2.0

The date on which the latest evidence was gathered to make an update if required. For example, the date of collection by a surveyor or third party information received.

• Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

• Nullable: true

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 2.0

1.0

The date the source of information for the update was provided. For example the date of imagery capture or the date of a field visit.

• Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

• Nullable: true

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

🆕 access_updatedate (formerly accesstype_updatedate)

This attribute was called accesstype_updatedate in data schema version 1.0, and was renamed access_updatedate from version 2.0 onward.

Date when the attribute was last updated.

• Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

• Nullable: false

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

🆕 accessedsiteid (formerly siteid)

This attribute was called siteid in data schema version 1.0, and was renamed accessedsiteid from version 2.0 onward.

The unique identifier (OSID) of the site feature to which the SiteAccessLocation feature relates.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Max Length: 36

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0, 2.0

routingpointid

The unique identifier (OSID) of the related SiteRoutingPoint feature.

From 25 April 2023, this value has no longer been populated. As part of a data enhancement programme in late Spring 2023, all Site Routing Point features were recreated as Road Nodes and therefore network references are now recorded and captured as roadnodeid in data schema version 1.0 of Site Access Locations.

See also Site Routing Point for more information.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: true

• Max Length: 36

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

🆕 accessednetworknodefeaturetype

The OS NGD network that the feature is accessed from (for example, Road Network).

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: true

• Code List Name: networknodefeaturetypevalue
• Max Length: 20

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 2.0

🆕 accessednetworknodeid (formerly roadnodeid)

This attribute was called roadnodeid in data schema version 1.0, and was renamed accessednetworknodeid from version 2.0 onward.

2.0

The unique identifier (OSID) of the network node that represents the point on that network that provides access to the Site Access Location feature.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: true

• Max Length: 36

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 2.0

1.0

The unique identifier (OSID) of the related RoadNode feature.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: true

• Max Length: 36

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

🆕 distancetonetworknode_m

The straight line measure between the accessednetworknodeid and the location of the access feature.

• Data Types: Number(GeoJSON), Float (GPKG), Real (CSV)

• Nullable: true

• Precision: 5

• Scale: 1

• OS NGD API – Features Filterable: No

• OS Select+Build Filterable: No

• Data Schema Version: 2.0