Aerial photographic interpretation was carried out to extract information on 50 types of landscape feature in the National Parks of England and Wales for two time periods, the mid 1970s and the late 1980s. The aim of the work was to identify and quantify changes at different administrative levels (National Park, County, District, and Parish). To facilitate this investigation, data were converted to digital format and analysed with a Geographic Information System (GIS). The work was carried out under commerical contract but required considerable research and development input to achieve the results. In this paper we report on the methodological developments. We present some of the main results at national level and give an example of how the GIS can be used to analyse landscape change in specific locations. The work for this Project was completed in 1991. At the beginning of a new millenium, we reflect on appropriate modifications to the approach in the context of current technical developments.
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Taylor et al. (2000) studied this question.