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ITN data structure

The OS MasterMap product specification defines the following data structure:

Figure 1: OS MasterMap product data structure

Layers

A layer is a set of related OS MasterMap themes. A layer may consist of one or more themes.

Themes

A theme is a logical collection of features grouped according to their classification or relationship with other features. Themes do not form part of the classification of a feature or affect feature life cycle rules; their primary purpose is to facilitate feature identification and use. There are three themes in OS MasterMap® Integrated Transport Network™ Layer (ITN): Road Network, Road Routing Information (RRI) and Urban Paths Network.

Features

Features are digital representations of real-world entities.

Attributes

An attribute is any item of information associated with an OS MasterMap feature. TOIDs and geometry, for example an x,y coordinate pair marking the location of a point feature, are both attributes, as are versionDate, theme and featureCode.

In this section:

ITN Technical specification – home

Purpose of this specification

ITN network features

ITN data structure

Overview of ITN themes

ITN Road Network theme

ITN Road Routing Information (RRI) theme

ITN Urban Paths theme

ITN Path Routing Information (PRI) theme

ITN Layer qualifiers

Feature types and attribution in the Road Network theme

Feature types and attribution in the Road Routing Information theme

Feature types and attribution in the Urban Paths Network theme

Feature types and attribution in the Path Routing Information theme

Descriptions of ITN Layer attributes

Attribution checklists for the Road Network and Urban Paths Network themes

ITN attribute definitions and values

ITN GML output format

ITN Layer GML examples

ITN character set

ITN weights and width attribution

ITN steep gradient attribution

This web page is part of the technical specification for OS MasterMap® Integrated Transport Network™ Layer. For the terms that apply to use of this specification, refer to Purpose of this specification.

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