OS NGD Fundamentals

Introduction

The following pages provide an overview of the OS National Geographic Database (NGD). They cover the core elements of its design, including the format of data you can access, the coordinate reference systems used, and how Change-Only Updates (COUs) will be provided, amongst other topics.

• Terminology and access

• File formats and naming

• Data ordering and currency

• COU supplies

• Data schema versioning

• Unique identifiers

• Coordinate reference systems

• Attribute information for feature types

These pages should be used in conjunction with the more detailed pages available within the Data Structure section which are specifically focussed on the different OS NGD themes, collections and feature types.