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Description: The ports are politically defined by port limits or Corps projects, excluding non-Corps projects not authorized for publication. The determination for the published Principal Ports is based upon the total tonnage for the port for the particular year; therefore the top 150 list can vary from year to year. US Army Corps of Engineers (USACE) at http://www.iwr.usace.army.mil/About/TechnicalCenters/WCSCWaterborneCommerceStatisticsCenter.aspx
Copyright Text: U.S. Army Corps of Engineers, Navigation Data Center, Waterborne Commerce Statistics Center, New Orleans, LA.
Description: The National Highway Planning Network is a comprehensive network database of the nation's major highway system. It consists of the nation's highways comprised of Rural Arterials, Urban Principal Arterials and all National Highway System routes. The data set covers the 48 contiguous States plus the District of Columbia, Alaska, Hawaii, and Puerto Rico. The nominal scale of the data set is 1:100,000 with a maximal positional error of ±80 meters. Refer to Strategic Highway Network (STRAHNET) (https://www.fhwa.dot.gov/policy/2004cpr/chap18.htm) for more information.
Description: The Rail Network is a comprehensive database of the nation's railway system at 1:24,000 to 1:100,000 scale. The data set covers all 50 States plus the District of Columbia. Refer to Strategic Rail Corridor (STRACNET) (https://www.fhwa.dot.gov/policy/2004cpr/chap18.htm) for more information.
Copyright Text: Acknowledgment of the Federal Railroad Administration (FRA)
Description: Military commuting layers are a product conducting an analysis of data from the Census Transportation Planning Products (CTPP) (http://www.fhwa.dot.gov/planning/census_issues/ctpp), then projecting origin-destination tables through the NC Statewide Travel Demand Model (https://connect.ncdot.gov/projects/planning/Pages/ModelResearchDevelopment.aspx) and filtering destinations which lie in a base.