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Contents

 

In this technical specification:

Purpose of this specification
Explains the terms under which we make this specification available.

ITN network features
A description of concepts underlying the features in ITN.

ITN data structure
Summarises the relationships between the data components in ITN.

Overview of ITN themes
Explains the features and feature groups that are collected within the different ITN themes.

ITN Road Network theme
Identifies the features included in the Road Network theme and describes the real-world information that is recorded in this theme.

ITN Road Routing Information (RRI) theme
Identifies the types of information captured in the RRI theme.

ITN Urban Paths theme
Identifies the features included in the Urban Paths theme and describes the real-world information that is recorded in this theme.

ITN Path Routing Information (PRI)
Identifies the types of information that are included in PRI data, which records movement restrictions or requirements that might affect the choice of a path.

ITN qualifiers
Explains the three categories of qualifiers (environmental, vehicular and date/time) used to qualify restrictions recorded in RRI and PRI.

Feature types and attribution in the Road Network theme
Identifies the features included in the Road Network theme and defines the attributes relevant to each feature.

Feature types and attribution in the Road Routing Information theme
Identifies the features included in the RRI theme and defines the attributes relevant to each feature.

Feature types and attribution in the Urban Paths Network theme
Identifies the features included in the Urban Paths Network theme and defines the attributes relevant to each feature.

Feature types and attribution in the Path Routing Information theme
Identifies the features and attribution present in Path Routing Information, which can support the Urban Paths Network theme by providing information that might affect a choice of route.

Descriptions of ITN attributes
Explains the different types of attributes to be found in ITN data.

Attribution checklists for the Road Network and Urban Paths Network themes
Identifies all the attributes applicable to each feature in the Road Network and Urban Path themes.

ITN attribute definitions and values
Defines the different attribute types found in ITN data and describes the attribute values applied to various feature types.

ITN GML output format
Explains how Ordnance Survey uses Geographic Markup Language and other XML based standards to encode information in ITN.

ITN GML examples
Shows examples of GML code for the different types of ITN features.

ITN character set
Lists the characters and accents found in ITN data.

ITN weights and width attribution
Explains how ITN provides information about weight and width restrictions on bridges in addition to restriction information captured in RRI.

ITN steep gradient attribution
Explains how ITN provides information on steep gradients.

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