Special Designation

Detailed attribute comparison for OSMM Highways Network's Special Designation Feature Type with the equivalent OS NGD feature type.

In OS NGD, all features have geometry and have been split into three separate feature types depending on their geometry type:

• Special Designation Area

• Special Designation Line

• Special Designation Point

The OS NGD attribute links below all point to Special Designation Area feature type, however structure and attribution of all three feature types are identical with the exception of the geometry measures, i.e. geometry_area and geometry_length attributes on Area and Line feature types respectively.

OSMM Attribute	OSMM Code List (if Applicable)	OS NGD Attribute	OS NGD Code List (if Applicable)	Notes
networkRef > element	N/A	usrn	N/A	Attribute serves the same purpose.
networkRef > LocationDescription	N/A	locationdescription	N/A	Attribute serves the same purpose.
networkRef > LocationStart	N/A	geometry	N/A	Information is now provided as geometry rather than attribution.
networkRef > LocationEnd	N/A	geometry	N/A	Information is now provided as geometry rather than attribution.
networkRef > LocationLine	N/A	geometry	N/A	Information is now provided as geometry rather than attribution.
networkRef > LocationArea	N/A	geometry	N/A	Information is now provided as geometry rather than attribution.
designation	SpecialDesignationTypeValue	designation	specialdesignationtypevalue	Attribute serves the same purpose.
description	N/A	designationdescription	N/A	Attribute serves the same purpose.
timeInterval > namedDate	N/A	Date Time Qualifier Reference Table > nameddate	N/A	Attribute serves the same purpose.
timeInterval > dateRange > StartDate	N/A	Date Time Qualifier Reference Table > startdate	N/A	Attribute serves the same purpose.
timeInterval > dateRange > EndDate	N/A	Date Time Qualifier Reference Table > enddate	N/A	Attribute serves the same purpose.
timeInterval > dateRange > StartMonthDay	N/A	Date Time Qualifier Reference Table > startmonthday	N/A	Attribute serves the same purpose.
timeInterval > dateRange > EndMonthDay	N/A	Date Time Qualifier Reference Table > endmonthday	N/A	Attribute serves the same purpose.
timeInterval > dayPeriod > TimePeriod >TimeRange >StartTime	N/A	Date Time Qualifier Reference Table > starttime	N/A	Attribute serves the same purpose.
timeInterval > dayPeriod > TimePeriod >TimeRange >EndTime	N/A	Date Time Qualifier Reference Table > endtime	N/A	Attribute serves the same purpose.
timeInterval > dayPeriod > TimePeriod > NamedTime	N/A	Date Time Qualifier Reference Table > namedtime	N/A	Attribute serves the same purpose.
timeInterval > dayPeriod > NamedPeriod	N/A	Date Time Qualifier Reference Table > namedperiod	N/A	Attribute serves the same purpose.
timeInterval > dayPeriod > NamedDay	N/A	Date Time Qualifier Reference Table > namedday	N/A	Attribute serves the same purpose.
contactAuthority > Identifier	N/A	contactauthority_identifier	N/A	Attribute serves the same purpose.
contactAuthority > AuthorityName	N/A	contactauthority_authorityname	N/A	Attribute serves the same purpose.
partialReference	N/A	partialreference	N/A	Attribute serves the same purpose.

The following attribution is not included in the OS NGD feature types:

1. validFrom – This was an unused attribute within OSMM Highways Network.

2. validTo – This was an unused attribute within OSMM Highways Network.

All the OSMM Highways Network products' attributes above use the names from the GML format; please see the Attribute naming differences between GML and GeoPackage formats page for the GeoPackage equivalents.