Acres of Non-Federal Developed Land, 1997
Description
This dot density map shows the total number of
1997 developed land acres aggregated by 8-digit
hydrologic unit. Developed land includes urban
and built-up areas and rural transportation
land. Each red dot = 15,000 acres.
Metropolitan Statistical Areas (MSAs) are
shaded beige. The MSA Central Cities are
indicated by black squares. Areas with 95% or
more Federal area are shaded gray.
Cautions for this Product:
This map may not be used for site-specific
information. The data have been aggregated such
that dots are placed by hydrologic units within
each state. The data have been masked and dots
do not appear on areas determined to be 95
percent or more Federal land. Data for Puerto
Rico and the U.S. Virgin Islands are aggregated
by 6-digit hydrologic unit.
Sources
Source:
National Resources Inventory, 1997
Distributor:
USDA-NRCS-RIAD
Reliability:
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 rather than site-
specific information.
Layers
Aggregate Layer:
Cross of State with 8 Digit Hydrologic Units and
Federal Land
Other Layers Displayed:
States, Rivers, Metropolitan Statistical Area (MSA) Lat/Long selections
from GNIS, Metropolitan Statistical Areas (MSA)
Definitions
Developed land:
A combination of land cover/use categories,
Urban and built-up areas, and Rural
Transportation Land.
Federal land:
A land ownership class designating land that is
owned by the Federal Government. It does not
include, for example, trust lands administered
by the Bureau of Indian Affairs nor Tennessee
Valley Authority (TVA) land. No data are
collected for any year that land is in this
ownership. [NRI-97]
Hydrologic units:
A hierarchical system developed by the U.S.
Geological Survey that divides the United States
and the Caribbean into 21 major regions, 222
subregions, 352 accounting units, and further
subdivided into 2,150 cataloging units that
delineate river basins having drainage areas
usually greater than 700 square miles. [USGS]
Land cover/use:
A term that includes categories of land cover
and categories of land use. Land cover is the
vegetation or other kind of material that covers
the land surface. Land use is the purpose of
human activity on the land; it is usually but
not always related to the land cover. The NRI
uses the term (land cover/use) to identify the
categories that account for all the surface area
in the United States [BS-1982; NRI-97]
Metropolitan Statistical Area (MSA):
A geographic entity, defined by the Federal OMB
for use by Federal statistical agencies, based
on the concept of a core area with a large
population nucleus, plus adjacent communities
having a high degree of economic and social
integration with that core. Qualifications of
an MSA requires the presence of a city with
50,000 or more inhabitants, or the presence of
an Urban Area and a total population of at least
100,000 (75,000 in New England). The county or
counties containing the largest city and
surrounding densely settled territory are
central counties of the MSA. Additional
outlying counties qualify to be included in the
MSA by meeting certain other criteria of
metropolitan character, such as a specified
minimum population density or percentage of the
population that is urban. MSA's in New England
are defined in terms of cities and towns,
following rules concerning commuting and
population density. MSA's were first defined
and effective June 30, 1993.
Rural transportation land:
A Land Cover/Use category which consists of all
highways, roads, railroads and associated rights-
of-way outside urban and built-up areas;
including private roads to farmsteads or ranch
headquarters, logging roads, and other private
roads, except field lanes. [NRI-97]
Urban and built-up areas:
A Land Cover/Use category consisting of
residential, industrial, commercial, and
institutional land; construction sites; public
administrative sites; railroad yards;
cemeteries; airports; golf courses; sanitary
landfills; sewage treatment plants; water
control structures and spillways; other land
used for such purposes; small parks (less than
10 acres) within urban and built-up areas; and
highways, railroads, and other transportation
facilities if they are surrounded by urban
areas. Also included are tracts of less than 10
acres that do not meet the above definition but
are completely surrounded by Urban and Built-up
land. Two size categories are recognized in the
NRI: (i) areas 0.25 to 10 acres, and (ii) areas
greater than 10 acres. [NRI-97]
Product Information
Product ID:
4974
Production Date:
12/4/00
Product Type:
Map
For additional information
contact the Resources Inventory and Assessment Division.
Please include the Product ID you are inquiring about.
nri@wdc.usda.gov
or 1400 Independence Avenue SW - P.O. Box 2890 -
Washington D.C. 20013. If you use our analysis products,
please be aware of our disclaimer.
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