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Lack of agreement on how to define and measure sprawl has hampered development of policy related to its causes and consequences. We question previous work for two reasons: the use of study areas that overbound or underbound sprawl landscapes, and the failure to account for land unavailable for development. We formulate “extended urban areas,” based on housing density and commuting patterns and argue that they represent a preferable geographic basis for measuring sprawl. We operationalize with satellite imagery a way for measuring land unavailable for development in these areas. We then compute five measures of urban development using the National Land Cover Data Base and decennial census data to assess the extent of sprawl in the extended urban areas of Atlanta, Baltimore, Boston, Los Angeles, and Washington. Our sensitivity analyses reveal that the measurement of sprawl critically depends on which land area forms the basis of the analysis, and, to a lesser degree, how one accounts for land unavailable for development. *This research was funded in part by the U.S. Geological Survey (USGS) under Cooperative Agreement No. 01CRAG0009, whose support is gratefully acknowledged. The opinions expressed in this report are the authors and do not necessarily reflect the views of the USGS or the organizations for whom they work. The authors gratefully acknowledge the efforts of Doug Towns and Jackie Cutsinger of Wayne State's Center for Urban Studies for their GIS and programming assistance. Anonymous referees provided helpful suggestions on an earlier draft.
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