Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text on the opening pages of each chapter.
Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.
Do not use for reproduction, copying, pasting, or reading; exclusively for search engines.
OCR for page 24
24
Figure 5.4. Freight Analysis Framework highway network.
Intermodal Terminals National Transportation Atlas Database (NTAD)
Intermodal terminals are facilities for transferring freight The National Transportation Atlas Database (NTAD) is a
from one mode, such as truck, to another mode, such as rail. collection of GIS data layers in 1:1,000,000 scale developed by
Knowing the location of these terminals is important when the U.S. Department of Transportation and other Federal
assigning a complete freight shipment from an initial origin agencies. The NTAD is available from the Bureau of Trans-
to its ultimate destination. It also is important in forecasting portation Statistics Mapping Center at http://www.transtats.
the behavior of freight since freight is neither produced nor bts.gov/mappingcenter.asp.
consumed at these terminals but merely transshipped. The
Bureau of Transportation Statistics provides data on the 5.4 Forecasting Data
location and attributes of these intermodal terminals, includ-
ing the type of commodity handled. While intermodal freight Population
is often considered freight moving in sealed containers, the Population data used in freight forecasting is typically used
intermodal terminals include all facilities where freight in traditional transportation forecasting. This includes both
including bulk shipments changes modes. a base and a forecast horizon year or years for a variety of
TAZ. For areas outside of the state study area, population
Bureau of Transportation Statistics Intermodal data can be obtained from the U.S. Census Bureau, which
Terminals typically is the basis for base year passenger transportation
forecasting. Forecasts of national population only are avail-
The Bureau of Transportation Statistics Intermodal Termi- able through commercial vendors.
nal Facilities data set contains geographic data for freight trans-
fer facilities in the United States. Attribute data includes the
Employment
modes serving the facility, the name of the railroad (if any)
serving the facility, the type of cargo, and the direction of the While employment data are typically used in passenger
transfer. The database provides location and attribute infor- transportation forecasting, the level of industry detail is
mation for use in national and regional network analysis insufficient for freight forecasting. Industry information is
applications. Attribute data are extracted from a variety of rail- developed from mandatory quarterly ES-220 submittals by
road and port carriers operators and associations. Data reflects employers to state employment security agencies and used by
conditions at facilities in 1995-1996 and is subject to frequent the U.S. Bureau of Labor to compute unemployment statis-
change. Some facilities may be dormant or permanently closed. tics. However processed, the data released to the public is
The intermodal terminal database is available from the aggregated to suppress confidential information. That data,
Bureau of Transportation Statistics Mapping Center at available from the Census Bureau's County Business Pat-
http://www.transtats.bts.gov/mappingcenter.asp. terns, is described below. More geographic detail is available
