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Colchester

“ One of the big positives we saw with Radius Topology was the continuing use for data cleaning after the PAI exercise itself has been completed. This will assure the quality of our data as we add further layers and expand the user-base. ”

Ann Hockey,
Research and
Resources Manager
Colchester Borough Council

With the advent of GPS technology, Ordnance Survey Great Britain (OSGB) is now able to deliver its 1:2500 data to a greater degree of accuracy than was previously possible. Although the OSGB Positional Accuracy Improvement (PAI) programme “future-proofs” the data, it also means that many local authorities now experience a mismatch between their own datasets (captured to pre- PAI base data), and the new base data.

Colchester Borough Council (CBC) covers an area of approximately 130 square miles, with the Planning Department acting as custodian to over 150 data layers. Planning decisions can be affected by even the smallest infringement of constraint areas, therefore it is essential for CBC to have all its data in the correct position in relation to the underlying base data.

The Planning Department is addressing this issue with a combined solution from 1Spatial and DottedEyes based on an Oracle9i database. The process initially corrects their current features to pre-PAI base data, then “shifts” the features in each layer to the correct position, and finally snaps the features to the OSGB data. Throughout this entire operation the process maintains information about how all these features are related, this gives CBC accurate, error-free data that they can analyse to test the alignment.

Read the full case study here

A version of this case study has also been written by Ordnance Survey Great Britain. Read the Ordnance Survey joint case study here.

www.colchester.gov.uk

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