OS MasterMap Topography Layer User guide Contents Section Page no Preface ..................................................................................................................................................4 Contact details ..........................................................................................................................4 Use of the product.....................................................................................................................4 Purpose and disclaimer ............................................................................................................4 Copyright in this guide ..............................................................................................................5 Data copyright and other intellectual property rights ................................................................5 Trademarks...............................................................................................................................5 Back-up provision of the product ..............................................................................................5 Using this guide.........................................................................................................................5 Chapter 1 Introduction to OS MasterMap products ..............................................................................6 Introduction ...............................................................................................................................6 The vector and raster data models ...........................................................................................7 The Digital National Framework (DNF).....................................................................................8 System requirements ................................................................................................................9 The data model .......................................................................................................................10 Layers .....................................................................................................................................10 Topography Layer..............................................................................................................10 Address Layers..................................................................................................................11 Integrated Transport Network (ITN) Layer.........................................................................12 Imagery Layer ....................................................................................................................13 Themes ...................................................................................................................................13 Features..................................................................................................................................13 Attributes.................................................................................................................................14 Chapter 2 Introduction to OS MasterMap Topography Layer............................................................15 Purpose...................................................................................................................................16 Applications.............................................................................................................................18 Chapter 3 Feature life cycles and tracking change.............................................................................19 Life-cycle rules ........................................................................................................................19 Unique feature references (TOIDs) ........................................................................................19 Feature version numbers ........................................................................................................20 Feature version date ...............................................................................................................21 Life cycle rules ........................................................................................................................21 Polygon feature life cycle rules ..........................................................................................21 Creation of polygon features due to real-world change.....................................................21 Deletion of polygon features due to real-world change .....................................................21 Modification of polygon features due to real-world change ...............................................22 Changes to geometry of polygon features.........................................................................22 Splitting of polygon features ..............................................................................................22 Joining of polygon features................................................................................................23 Change of polygon feature classification...........................................................................23 Modification of polygon features due to error correction ...................................................24 Line feature life cycle rules ................................................................................................24 Inferred links ......................................................................................................................25 Creation of line features.....................................................................................................25 Deletion of line features .....................................................................................................25 Modification of line features due to real-world change ......................................................26 Modification of line features due to error correction ..........................................................26 General point feature life cycle rules .................................................................................26 Creation of point features ..................................................................................................26 Deletion of point features...................................................................................................26 Modification of point features due to real-world change....................................................26 Modification of point features due to error correction ........................................................26 Chapter 4 OS MasterMap Topography Layer themes.........................................................................27 Administrative boundaries.......................................................................................................27 OS MasterMap Topography Layer user guide contents v1.9 – 12/2010 © Crown copyright Page 2 of 142 Parliamentary boundaries..................................................................................................27 Local government boundaries ...........................................................................................28 Application of precedence .................................................................................................28 Buildings..................................................................................................................................29 Heritage and antiquities ..........................................................................................................29 Land ........................................................................................................................................30 Rail ..........................................................................................................................................31 Roads, tracks and paths .........................................................................................................31 Roads.................................................................................................................................31 Tracks ................................................................................................................................32 Paths..................................................................................................................................32 Made paths ........................................................................................................................32 Unmade paths....................................................................................................................32 Structures................................................................................................................................33 Terrain and height...................................................................................................................34 Triangulation stations.........................................................................................................34 Spot height.........................................................................................................................34 Water.......................................................................................................................................34 Theme rules 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