Acknowledgments
We gratefully acknowledge Barry Hunter and contributors to Geograph British Isles (http://www.geograph.org.uk/credits/2008-04-31), whose work is made available under the following Creative Commons Attribution-ShareAlike 2.5 License (http://creativecommons.org/licenses/by-sa/2.5/).
Ross Purves's and Alistair Edwardes's work on Geograph is also gratefully acknowledged. This has been undertaken as part of the project TRIPOD, supported by the European Commission under contract 045335.
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