Abstract
The whole land area of Great Britain is covered by mapping at one or another of the three basic scales of 1:1250, 1:2500 or 1:10 000; this requires nearly 220 000 individual map sheets. The Ordnance Survey is responsible for the custody, maintenance and revision of this ‘Archive’ of topographic information. Many of the maps are subject to a process of ‘continuous revision’, for which ground survey techniques are usually most suitable, but sometimes aerial photography is used; and the applications of photogrammetry for periodic update or improvement of other areas are increasing. The impact of digital mapping introduces complex requirements for the digital capture of revision information but it may permit some of the constraints imposed by scale, specification and sheet-edges to be reviewed. The full integration of photogrammetry into an environment of topographic databases promises to be interesting and challenging.
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