Countryside Survey Summary Data A range of datasets are available via the NERC Environmental Information Platform, with associated citations and Digital Object Identifiers (DOIs). Stock data: National estimates of Habitat extent Maps: | | Tables: | | | | National estimates of linear feature extents Maps: | | | Tables: | | | Change data: National estimates of Habitat extent 1990-1998-2007: 1990-1998: 1990-2007: 1998-2007: