Data compiled from land files: geographical buffers built around spot objects representing residential plots. The basic land files come from the 2011 vintage. To each task is associated a period: 1962 (base year) or period at which the urban spot appeared: 62-68, 68-75, 75-82, 82-90, 90-99, 99-2010. Web and downloadable documents describe how to measure space consumption and urban sprawl
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