Ordnance Survey – Great Britain's national mapping agency
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This page has been designed to provide some answers to the common questions that are directed to Ordnance Survey about OS MasterMap. Please use the search box on the right to find a frequently asked question.
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1. What is the difference between geocorrected and orthorectified imagery?
2. I'm having problems with the Java® plug-in. What advice can you give?
3. What is the default OS MasterMap style?
4. What scale is OS MasterMap® Topography Layer data?
5. What do 'absolute positional accuracy' and 'relative positional accuracy' mean?