Habitat Surveys
Phase 1 Habitat Surveys This classification was developed in the 1980s for the purpose of mapping terrestrial and freshwater habitats within SSSIs and nature reserves, and for larger scale strategic surveys. The classification has subsequently been used extensively for major surveys, including a Phase 1 habitat survey of Wales completed in 1996. The classification has been adopted by the Institute of Environmental Assessors as one of the standard methods for preparation of Environmental Statements under the Environmental Impact Assessment Regulations 1988.
National Vegetation Classification Scheme (NVC) This is a phytosociological classification of terrestrial and freshwater vegetation, it is therefore less comprehensive in cover than the Phase 1 classification. The NVC is employed as the main classification for terrestrial habitats in Guidelines for the Selection of Biological SSSIs and has been used to interpret Annex I of the EC Habitats Directive where relevant. The conservation agencies and others have extensive data holdings coded using the NVC.
River Corridor Surveys are a means of recording the habitat types and general health of watercourses.