3.1.1
The National Street Gazetteer (NSG) provides the nationally definitive dataset for Street references (USRNs) linked to the names and extents of Streets associated with them in England and Wales.
3.1.2
The Additional Street Data (ASD) is not a nationally definitive dataset, rather it is an abstract of data collated from other sources.
3.1.3
Many of these sources are legally definitive, for example, Traffic Regulation Orders (TRO), PRoW Definitive Maps, section 36 of the Highways Act 1980 - List of Streets.
3.1.4
The ASD designations are not a legal substitute for these sources.
3.1.5
The purpose of this Reference Manual is to:
- Provide the source reference for GeoPlace to receive DCA Street Updates from Local Street Gazetteers (LSGs) created and maintained by local government and ASD Updates from National/Regional Highway Authorities, in England and Wales.
- Provide the basis for forming a consistent national dataset, the NSG, made up from the constituent LSGs and ASD, for NSG Users’ and for the Ordnance Survey street products.
- Strengthen the links between the Authority Street Custodian and all the DCA roles listed in Section 3.3 within DCA organisations and NSG Users.
- Ensure that accurate and consistent geospatial based street information is captured in an LSG and ASD is delivered as DCA Street Updates and ASD Updates to GeoPlace.
- Consider the technical definition of LSG, ASD and NSG data contained within the statutory legislation, supporting codes of practice and technical specifications and expand on the file definitions specified in the documents.
- Use in conjunction with the release of the EToN v6 Technical Specification which became effective on 1st October 2013.
- Take account of previous versions of the document (v3.x) which were compliant with the Technical Specification for EToN (v4 and v5) dated October 2007 and April 2009 and the 4th edition Code of Practice for the Co-ordination of Street Works and Works for Road Purposes and Related Matters dated October 2012.
- Introduce further changes to this Reference Manual, if required, when further provisions of the Traffic Management Act 2004 are introduced, or if further amendments, including Welsh Assembly Government versions, are made to the aforementioned documents.
- Provide guidance on the British Standard BS 7666-0:2006, BS 7666-1:2006 and BS 7666-2:2006 and its implementation by GeoPlace. Custodians should familiarise themselves with BS 7666-2:2006 for definitions of the Fields and data items described in this Reference Manual.
- Refer Authority Street Custodians, National/Regional Highway Authorities and NSG Users’ to the GeoPlace Data Transfer Format 8.1 for Streets specification document.
3.1.6
The NSG is collated monthly from DCA Street Updates and ASD Updates which are created, maintained and delivered by County and Unitary Councils and National/Regional Highway Authorities for use by NSG Users throughout government and beyond.
3.1.7
The DEC-Streets is for the use of DCA organisations. It provides guidance for:
- Street Custodians when entering and maintaining data in their LSG software systems.
- SNN Officers when creating or changing Street Names or property numbers.
- Authority Address Custodians when entering and maintaining data in their LLPG software systems.
- NSG Users when using NSG data.