1970's Land use data refined with 1990 population data to indicate new residential development for the conterminous United States
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资源简介：
This data set represents U.S. Geological Survey (USGS)
historical Land Use and Land Cover (LULC) from the 1970's that
has been refined with 1990 population density at the block group
level to indicate new residential development representative of
the 1990's. Any area having a population density of at least
1,000 people per square mile had been re-classified as "urban"
land in this data set.
创建时间：
2016-10-29
