Counties layer

The States layer is simply an outline of the counties in the covered state(s), with some additional information.

The counties of Colorado, colored by population Counties of central Florida

Details

Name

The date of the county

State

The state in which the county is located

Type

Whether this is a county or (rarely) some other political division, such as a municipality.

Surface

The surface of the county.

Population in 2008

The number of inhabitants in the county as of January 1, 2008, as estimated by the U.S. Census Bureau

FIPS Code

The FIPS code for the county

Options

Transparency

Determines how much the underlying layer(s) will show through this layer.

Fill

  • Transparent : no color is used to fill the outline
  • Color : color is used to fill the outline

Color

  • Random : a random color is assigned to each county
  • Population : the color is proportional to the county's population

Origin

Contents of the S data system
Shorelines and county boundaries as a network

Bruce Peterson
Oak Ridge National Laboratory
2003 January 21, rev 2003 July 20

Description

The S-network contains shorelines and North American political boundaries represented as a link-node network. As a network, analysis and maintenance may be facilitated by the use of techniques and programs developed for other types of networks. The network is analytic, and should produce polygons of any feature in the attribute set. Except for minor editing and edge matching, the US portion of the network was extracted from TIGER/Line files of approximately 1993. Hydrologic features without width, that is, represented by a single polyline with land on both sides, are not included. No hydrologic features are named. FIPS codes identifying counties are those of 2000. However, county sub-division numbers allow a mapping into 1990 FIPS codes. The Canadian provinces and Mexican states were drawn from the Bureau of Transportation Statistic's NORTAD dataset of 1997 (which was in turn derived from the Digital Chart of the World) and were integrated with the US portion. Canada and Mexico contain outside shorelines only, and Nunavut has not been separated from Northwest Territories.