New Acres of Developed Land in Metropolitan Areas, 1992-1997
This dot map shows the increase in acres of developed land (urban areas and rural transportation land) from 1992 to 1997 within metropolitan counties. Each red dot represents 5,000 new acres of developed land in a metropolitan area. There was a total of 11,217,000 acres developed, with 7,402,400 acres located in metropolitan areas. A county was considered metropolitan if any portion of the county was in a Metropolitan Statistical Area. Metropolitan Statistical Areas (MSAs) are shaded beige. MSA Central Cities are indicated by black squares. Areas with 95% or more Federal area are shaded gray.
Cautions for this Product:
This map does not show the total amount of developed land. Data are not collected on Federal land. Data are not available for Alaska or the Pacific Basin. Data are aggregated by county, not MSA. In New England and Puerto Rico MSA and county boundaries (NRI service area boundaries in Puerto Rico) do not coincide. In these areas some acres included in the metropolitan area total are not shown because they fell outside MSA boundaries.
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 rather than site- specific information.
Source: U.S. Census Bureau
Distributor: U.S. Census Bureau
Aggregate Layer: County with Federal Land
Other Layers Displayed: States, Rivers, Metropolitan Statistical Areas (MSA), Metropolitan Statistical Area (MSA) Lat/Long selections from GNIS
A combination of land cover/use categories, Urban and built-up areas, and Rural Transportation 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]
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 ID: 5123
Production Date: 12/13/00
Product Type: Map
For additional information contact the Resources Inventory and Assessment Division. Please include the Product ID you are inquiring about. firstname.lastname@example.org 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.