Percent of Non-Federal Area in Developed Land, 1982 This map
shows the spatial distribution of the nation's developed land
(urban areas and rural transportation land) in 1982 as a
percentage of the total non-Federal land area for each 8-digit
hydrologic unit. Nationwide 4.7 percent of non- Federal area is
developed. Areas with 95% or more federal area are shaded gray.
Cautions for this Product: Use this map only to identify broad
spatial trends. Data are not collected on Federal land. Data are
not available for Alaska or the Pacific Basin. Data for Puerto
Rico and the U.S. Virgin Islands is shown by 6-digit hydrologic
unit. Source: National Resources Inventory, 1997 NRI sample data
are generally reliable at the 95% confidence interval for state
and certain broad substate area analyses. Generally, analyses
that aggregate data points by smaller geographic areas and/or
more specific criteria result in fewer data points for each
aggregation and therefore less reliable estimates. NRI maps
reflect national patterns