6.3.6.1
For the definition of extremity points, see Section 6.3.1.
6.3.6.2
For guidance on where the extremity points of a Street must be placed, see BS 7666:2006 Part 1 page 11.
6.3.6.3
For guidance on how to set the extremity points if a Street crosses an SNN Authority boundary, see Section 10.3.
6.3.6.4
The SNN Officer must supply the initial extremity points for a new type 1 Street. Those coordinates must be set with a tolerance of the width of the carriageway. This is enough for Level 1 LSG data.
6.3.6.5
The Authority Street Custodian must supply the initial extremity points for a new type 2 Street and a new type 4 Street.
6.3.6.6
When the level 3 geometry of a type 1, 2 or 4 Street is defined, the Authority Street Custodian must pass any revision to those coordinates back to the Authority Address Custodian.
6.3.6.7
The Authority Street Custodian and the Authority Address Custodian must liaise to ensure consistency of the data with SNN.
6.3.6.8
The Authority Street Custodian is responsible for all data associated with a type 3 Street.
6.3.6.9
The tolerance Field is the radius of influence of the chosen coordinated point and its value encompasses all likely definitions of the end of the street.
6.3.6.10
The value of tolerance must consider the quality of the recorded coordinates. The tolerance for each Record is normally 1m. The Authority Street Custodian must try to achieve a maximum tolerance of 1 metre. Where appropriate, data must be continuously improved.
6.3.6.11
The tolerance Field has a maximum permitted value depending on the Street State Code. For full details, see Table 6. Closed Records must not be retrospectively corrected. Only new Records created after 1st October 2013 are subject to this rule.
1 - Under Construction
50m
2 - Open
50m. Once completely open, 10m or half the carriageway width whichever is the smaller.
4 – Permanently closed
10m if closed date is later than 1 October 2013.
5 – Street for addressing purposes only
10m
Table 6 - Maximum Permitted Tolerance Value