5.3.16.1
Each Street Record in the ASG is maintained to level 1 as defined in the DEC-NSG and shall hold the start and end Easting and Northing coordinates of the Street.
5.3.16.2
These coordinates shall be provided with a maximum tolerance for Street STATE = 2, 4 or 5 of 10m for agreed Street Records which match in the NSG and the ASG.
5.3.16.3
The coordinates must be coterminous to or within the SNN Authority administrative area associated with the Street except if it is necessary to cross the border to complete a specific Street, for example a cul-de-sac.
5.3.16.4
For guidance on where the extremity points of a Street should be placed, see BS 7666-1:2006 page 11.
5.3.16.5
The SNN Officer is responsible for supplying initial extremity points for a new type 1 Street. Those coordinates should be set with a tolerance of the width of the carriageway. This is sufficient for level 1 LSG data.
5.3.16.6
The Authority Address Custodian is responsible for providing initial extremity points for a new type 2 Street and a new type 4 Street to the Authority Street Custodian who should pass any revision to those coordinates back to Authority Address Custodian.
5.3.16.7
When the level 3 geometry of a type 1, 2 or 4 Street is defined, the Authority Street Custodian should pass any revision to those coordinates back to Authority Address Custodian. The Authority Street Custodian and the Authority Address Custodian must liaise to ensure consistency of the data with Street Naming and Numbering.
5.3.16.8
The Authority Street Custodian is responsible for all data associated with a type 3 Street.