|
|
States layer
The States layer is simply an outline of the main state(s) and surrounding states for context.
 |
 |
| The state outlines for Geology NY |
Zoomed in on lower Manhattan |
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.
|
