OS Locator: technical information and specifications

Technical Information

Column	Field name	Format	Example	Description
1	Name	A*	ALRESFORD ROAD	Feature name
2	Classification	A*	B3404	Road number classification
3	Cent x	I6	449590	X co-ord for centre point of road object
4	Cent y	I7	129430	Y co-ord for centre point of road object
5	Min x	I6	448797	X co-ord for SW corner of the road object box
6	Max x	I6	450392	X co-ord for NE corner of road object box
7	Min y	I7	129422	Y co-ord for SW corner of the road object box
8	Max y	I7	129510	Y co-ord for NE corner of road object box
9	Postsector	A7	SO230	Postcode sector for the centre point of the object
10	Settlement	A	WINCHESTER	Town in which the centre of the object falls
11	Locality	A*	St. John and All Saints	Newly created dataset
12	Cou_Unit	A*	Hampshire County	County or Unitary Authority in which the centre of the object falls
13	Local Authority	A*	Winchester District	Local Authority in which the centre of the object falls
14	Tile_10k	A6	SU42N	1:10 000 tile reference for the centre point of the object
15	Tile_25k	A	SU42	1:25 000 tile reference for the centre point of the object
16	Source	A*	ROADS	Source of information

Specification	OS Locator™
Coverage	Great Britain (England, Scotland and Wales)
Availability	Order by; Great Britain
Data source	OS Locator is derived from; OS MasterMap Integrated Transport Network™ Layer, Boundary Line™, Code Point^® with polygons, Meridian^® 2 and a specifically created localities database, with the product first released in November 2004.
Data structure	Vector
Scale	Nominal scale of 1:10 000. OS Locator was designed to be viewed with 1:10 000 scale data, principally OS Street View, which is best displayed at the following scales: Recommended minimum to maximum scale range for viewing is 1:5000 to 1:15 000 scale. It is best viewed between 1:7000 and 1:10 000 scale.
Transfer format	Colon separated variable text file.
Storage	108 Mb
Supply media	CD
Coordinate precision	1 metre
Update interval	Available every six months, usually May and November.
Styling	A symbol set is not supplied with this product.
Geometry type	Point and polygon.
Coordinate reference system	British National Grid (OSGB36)
Unique reference	Features do not have unique identifiers

The OS Locator user guide contains information on the technical specification and product specification to help you understand how to use the data.

OS Locator is supplied as an ASCII Text file, colon separated (ASCII: American Standard Code for Information Interchange)