Contents Boundary-Line™ user guide Chapter 1 An introduction to Boundary-Line ........................................................................................................................................ 9 Boundary-Line features ........................................................................................................................................................................9 Boundary-Line benefits ......................................................................................................................................................................11 Boundary-Line applications................................................................................................................................................................11 Boundary-Line files and sub-levels ....................................................................................................................................................12 Requirements to utilise Boundary-Line...............................................................................................................................................14 Hardware ......................................................................................................................................................................................14 Software........................................................................................................................................................................................14 Transfer formats............................................................................................................................................................................14 Media............................................................................................................................................................................................14 Update..........................................................................................................................................................................................14 Chapter 2 Overview of Boundary-Line ............................................................................................................................................... 15 Data overview.....................................................................................................................................................................................15 Basic principles ............................................................................................................................................................................15 Boundary-Line data source ..........................................................................................................................................................15 Complex polygons........................................................................................................................................................................16 Feature information .......................................................................................................................................................................17 Feature position ............................................................................................................................................................................17 Feature attribute data....................................................................................................................................................................19 Area codes ...................................................................................................................................................................................19 Other attributes .............................................................................................................................................................................19 Unique identifiers for administrative unit, link and polygon ..........................................................................................................19 Text ...............................................................................................................................................................................................19 Chapter 3 Boundary-Line explained................................................................................................................................................... 20 Relationships of administrative areas.................................................................................................................................................20 Boundary-Line principles and features ..............................................................................................................................................24 Administrative area .......................................................................................................................................................................24 Area values ...................................................................................................................................................................................25 Boundary ......................................................................................................................................................................................26 Ceremonial counties .....................................................................................................................................................................26 Detached parts .............................................................................................................................................................................26 Boundary-Line user guide contents v4.1 – 10/2005 © Crown copyright Page 1 Divorcement..................................................................................................................................................................................26 Effective date ................................................................................................................................................................................27 Exception areas ............................................................................................................................................................................28 Honorary titles...............................................................................................................................................................................31 National boundaries......................................................................................................................................................................31 Census agency codes..................................................................................................................................................................31 Unannexed areas .........................................................................................................................................................................34 Unitary authorities .........................................................................................................................................................................34 The coastline and associated items ...................................................................................................................................................34 Extent of the realm (EOR) .............................................................................................................................................................34 Foreshore......................................................................................................................................................................................36 Islands and rocks in the sea .........................................................................................................................................................37 Mean high water (springs) ............................................................................................................................................................37 Mean low water (springs)..............................................................................................................................................................37 Normal tidal limit (NTL) .................................................................................................................................................................38 Pier................................................................................................................................................................................................38 Point B...........................................................................................................................................................................................38 Seaward extensions......................................................................................................................................................................38 Structures in the sea .....................................................................................................................................................................39 Appendix A Glossary...........................................................................................................................................................................