Great Britain’s national mapping agency, the Ordnance Survey (OS), has a worldwide reputation for providing the most accurate and high quality mapping of any nation. The increasing availability and use of high technology surveying methods and global positioning systems, is enabling the OS to break new ground by measuring and recording the position of real world features more accurately than ever before. The most recent initiative in this area, with a focus on rural areas, is known as the Positional Accuracy Improvement (PAI) Programme.
For many years, organisations in the public and private sector have also been capturing their own information, in GIS and CAD systems, against the backdrop features of Ordnance Survey data. Features such as building footprints, property boundaries and highways have been digitised by reference to the location of features on the base map. These organisations now have the opportunity to ensure that their own spatial information assets remain as accurate as possible by realigning them to newly updated base map data being distributed by the OS.
ESRI (UK), the leading provider of GIS software has released two new tools that will help its customers undertake this task. PAI Tools are available as free downloads from the company’s web site at
ESRI (UK)’s PAI Tools are designed to perform two important tasks. The Load Link Files’ tool enables links representing position change, supplied by the Ordnance Survey, to be loaded directly into a personal geodatabase, making this information readily available for use with the ESRI GIS product set. The Shift data’ tool allows you to use GIS to select relevant features for shift, and shifts your data relative to the Ordnance Survey base map and links.
For many organisations, the challenge of updating their data is not a simple one. Many thousands of features are potentially affected by PAI and the task of shifting and checking all the data requires careful planning and coordination. ESRI (UK) is therefore also providing specialised consultancy services to help smooth and accelerate the implementation of data update projects. This includes for example a Data Audit service to identify datasets affected by the PAI Programme and on-site training in the new tools.
For more information about the PAI Programme, visit
www.esriuk.com/pai where you will find further resources and guidance documents. ESRI (UK) is also running a series of technical update seminars, which cover PAI and other topics. For more information on these visit
For supporting screen shots or further information, please contact Lee Kilroy at the Aylesbury office on Tel 01296 745 632, Fax 01296 745 544,
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For over 30 years ESRI Inc of Redlands, California has been the leading supplier of geographic information systems (GIS) software with more than 220,000 clients worldwide. ESRI (UK) Ltd is the UK distributor for ESRI software. ESRI (UK) Ltd and its sister company CAPS Solutions Ltd make up the ESRI Holdings Ltd group.
Within the UK, ESRI (UK) Ltd has established the ESRI Arc’ software family as the GIS and mapping system of choice, with many thousands of installations in a broad range of market areas including business, finance, government, utilities, defence and education. ESRI (UK) Ltd is focused entirely towards the provision of GIS software and professional services to our extensive user base, new clients and business partners.