A Treemap is a visualisation of hierarchical structure. You can upload data to online tools such as Many Eyes to create interactive Treemaps. However, we are not aware of any standard desktop tools that can be used to create Treemaps (please email if you know of anything!).
Examples presented on this site have been taken from published material available on the web. If you are the author of the example, and would like this removed from the site (or additional information provided), please contact us. Where shown, Ordnance Survey data is reproduced under Communities and Local Government Licence 100024857. Crown copyright material is reproduced with permission of the controller of HMSO.