The S-network contains lines representing shorelines, US county boundaries, and North American provinces. It is not a transportation network, but is used extensively in analyses with the other networks. The data are used primarily for background maps and to cut other geographic objects into counties.
The first plot below shows the complete S-network in the vicinity of Memphis, with the highway network for context. Land boundaries are black, water boundaries red, and shorelines green.
SDUO polygons |
Ocean shorelines at Chesapeake Bay |
The complete native format files are in 6 regional sections plus the state boundary files (s00). (The state boundary files are necessary no matter what states you may be interested in.) Each region contains separate files for each of the states in it. The entire US is approximately 460 MB uncompressed. County boundaries alone for the US are also available in shapefile format.
Differences from the previous version ST2C: Identification of ocean shorelines; Addition of Canada and Mexico.
Documentation (12 KB uncompressed ASCII)
Download SU37 (native format)
state
boundaries (1,778 KB) CT,DE,DC,ME,MD,MA,NH,NJ,NY,NC,PA,RI,SC,VT,VA,WV
(22,223 KB) AL,FL,GA,KY,MI,MS,OH,TN
(24,481 KB) IL,IN,IA,MN,MO,NE,ND,SD,WI
(31,656 KB) AR,KS,LA,NM,OK,TX
(25,868 KB) AZ,CO,ID,MT,NV,UT,WY
(11,596 KB) AK,CA,HI,OR,WA,PR,VI,
Pacific islands, Canada, Mexico (15,681
KB)
Download SCUL North
American boundaries
as polyline shapefile (11,429 KB)
Download
SCUO North
American boundaries
as polygon shapefile (11,939 KB)
Download
SDUL Boundaries
and ocean shorelines as polyline shapefile (34,524
KB)
Download
SDUO Boundaries
and ocean shorelines as polygon shapefile (37,293
KB)
List
of county codes (272KB)
CTA Transportation Networks - Home Page
