OS Emergency Services Gazetteer
A Lightning Talk
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OS Data HubA Lightning Talk
Last updated
The OS Emergency Services Gazetteer product is a comprehensive and maintained gazetteer of locations including names, places, and objects.
Aligned to the AddressBase Premium Format.
Every feature in OS ESG will have a Unique Property Reference Number (UPRN).
Coverage is England, Scotland and Wales.
A set of granular classifications types.
Comprises of the Basic Land Property Unit (BLPU), Land Property Identifier (LPI) and Classification components ONLY.
Published monthly in GeoPackage and CSV formats.
The OS ESG provides a national, consistent and maintained view of the locations. Currently these are Named Junctions and Geographical Names, but with a wider range of features in future releases
It enables quick and accurate gazetteer searches and visualisation in applications and supports incident response, planning and coordinating emergency responses, situational awareness and incident reporting.
| March 2024 | Future Releases |
|---|---|
OS ESG will be made available via the OS Data Hub, as part of Premium Downloads.
The GeoPackage format comes ready to load into the GIS package of the users choice with different gpkg files for each layer. You will need to join the data using the UPRN.
The CSV format is more suited for loading into a database. All of the same feature types are accessible in csv format and all the same attribution as the Geopackage, however instead of storing the geometry in a GIS ready format, ‘BLPU’ for example is stored as a POINT attribute with a co-ordinate pair for each point.
The OS ESG will align to the AddressBase Premium specification, in line with user requirements. Therefore, it will be structured as a series of relational tables:
Basic Land and Property Unit (BLPU) - a real-world object that is ‘an area of land, property or structure of fixed location having uniform occupation, ownership or function’.
Local Property Identifier (LPI) - a structured entry that identifies a BLPU. The AddressBase Premium data structure provides the facility to describe a BLPU by more than one LPI. In England and Scotland there will be one Approved LPI, while in Wales there will be two Approved LPIs (English and Welsh)
Classification - a structured entry that provides the code for the type of feature.
The data includes names of features and places of geographic significance, providing orientation and identity.
A subset of the existing OS NGD Geographical Names, such as named water and geographic features, will be provided as part of OS ESG.
The data offers a comprehensive list of names of features such as hills, valleys, cliffs and waterfalls.
OS ESG Geographical Names is a subset of the OS NGD Named Point Feature. For example, woodlands aren’t in OS ESG as they are included within AddressBase Plus and AddressBase Premium
A named intersection between roads at a junction or roundabout. The intersection will be assigned a modelled name based on the names of the intersecting roads and may have a number or an official name. The feature will have a classification code and description also e.g. CT14MJ Numbered Motorway Junction.
Junction features will be provided for junctions where two or more named or numbered roads intersect. The SAO Text field can include Alternate Road Names. These can be a different spelling or an alternate road name.
In OS ESG as there is a hierarchy of assigning an LPI area name, it is derived from:
The OS NGD Geographical Names Named Area Polygon if it is within one (this may have a different extent to the locality of the same name in Addressing data)
(NEAR) indicates either within 1 km of a settlement onshore, or within 500 m of a named island or 1 km from a Lower Tier Local Authority if the point is offshore
In non-urban areas the Lower Tier Local Authority is provided.
The OS ESG feature area name can include a combination of polygon descriptions based on hierarchy e.g. Suburban Area, Other Urban Area, City
The address & street data in your 999 Control system that the OS ESG may sit alongside may have a locality field in some instances. This locality information may differ from the Area Name in OS ESG as they come from a different source
The USRN is supplied as part of the OS ESG is to allow compatibility with AddressBase Premium so it can be used with existing import tools
When assigning the USRN to a junction, the USRN of the lowest classification Street within AddressBase intersecting a junction is assigned e.g. if you have a Designated Street Name and Officially Described Street then the Officially Described Street is selected, see StreetRecordTypeCode in the AddressBase Premium Technical Specification.
If there are multiple Streets with the same lowest classification, the USRN of the shortest Street intersecting a junction is assigned.
Where roads intersecting a junction do not have an associated Street and hence a USRN, the USRN of the nearest non-motorway Street is assigned.
The OS ESG will only reference USRNs that are in AddressBase Premium.
Geometry: Motorway Junctions and Roundabouts are a single point geometry in OS ESG and Multipoint geometry in OS NGD Named Junctions
Schema: OS ESG is in an AddressBase Premium format and OS NGD Named Junctions have an OS NGD schema
Attribution: OS ESG has an AREA_NAME. There is no AREA_NAME on the OS NGD Named Junction feature
Classification: OS ESG has a classification scheme and OS NGD Named Junction has a description
Looking at the OS NGD Geographical Names Lightning Talk may also be of benefit.
Links that may be useful:
This content has been developed from what was originally a Lightning Talk PowerPoint slide set. These slides are available to PSGA members to view and download from the PSGA members area of the OS website
Names and Numbers of Junctions
Bridge Interactions
Geographical Names
Tunnels
Slipways
Weirs
Motorway Marker Posts
Motorway Emergency Phones
Vernacular Names
