Special Designation Area
Special Designations are statutory and advisory designations that can be applied to protect a highway when street or road works are to be undertaken. A Special Designation feature will reference back to the Roads product through network reference and will reference a Street Feature. Features which are a partial reference will provide a network reference location.
Temporal filtering
The earliest date on which you can request a one-off snapshot of a date in the past for data in this feature type is 29 September 2022.
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.
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
authorityid
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Max Length: 17
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0
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
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
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The date this version of the feature was superseded by an update or ceased to exist.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
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
effectivestartdate
The date on which this record was inserted into the Local Authority database.
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
effectiveenddate
The date on which the record ceased to exist
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
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
Geometry Type: MultiPolygon
geometry_area
The measured area of the geometry in square metres.
Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)
Nullable: false
Precision: 15
Scale: 6
OS NGD API – Features Filterable: Yes
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
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: associatedstreetdatadescriptionvalue
Max Length: 20
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0
designation
Type of special designation.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: false
Code List Name: specialdesignationtypevalue
Max Length: 70
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0
designationdescription
Additional information describing the special designation.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 254
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
locationdescription
Textual description of the location extent of the referenced property when the feature partially references the network.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 250
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
timeinterval
Time period to which the restriction applies.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 254
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
contactauthority_identifier
The identifier of the Highway or Road Authority to be contacted for further consultation about the special designation.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 4
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0
contactauthority_authorityname
The name of the Highway or Road Authority to be contacted for further consultation about the special designation.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 100
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: Yes
Data Schema Version: 1.0
partialreference
Flag to indicate that the maintenance feature partially references a Street.
Data Types: Boolean (GeoJSON), Integer (GPKG), String (CSV)
Nullable: false
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
usrn
The Unique Street Reference Number (USRN) of the referenced Street.
Data Types: Integer (GeoJSON), Integer (GPKG), Integer (CSV)
Nullable: false
OS NGD API – Features Filterable: Yes
OS Select+Build Filterable: No
Data Schema Version: 1.0
Date Time Qualifier
datetimequalifierid
The OS identifier of the date time qualifier feature.
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
specialdesignationid
The identifier for the Special Designation feature.
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
specialdesignationversiondate
The version date of the Special Designation feature.
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
nameddate
The named month or period this time interval applies to.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: nameddatevalue
Max Length: 9
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
startdate
The date at which the restriction applied starts. This date will be in the format YYYY-MM-DD.
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
enddate
The date at which the restriction applied ends. This date will be in the format YYYY-MM-DD.
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
startmonthday
The date at which the restriction applied starts. This date will be in the format -MM-DD.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 6
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
endmonthday
The date at which the restriction applied ends. This date will be in the format MM-DD.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 6
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
namedtime
These are named time periods that do not relate to the same time each day.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: namedtimevalue
Max Length: 17
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
starttime
The time the restriction begins.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 8
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
endtime
The time the restriction ends.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Max Length: 8
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
namedperiod
A specified period in which the restriction applies.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: namedperiodvalue
Max Length: 28
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
namedday
The named day this restriction applies to.
Data Types: String (GeoJSON), String (GPKG), String (CSV)
Nullable: true
Code List Name: nameddayvalue
Max Length: 15
OS NGD API – Features Filterable: No
OS Select+Build Filterable: No
Data Schema Version: 1.0
Last updated