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Readme File for Filetype ctpp2000 -
Census of Transportation Planning Package, 2000 Census
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Overview :
Technical Documentation :
Access Via MoDOT SEIR Application :
Related Filetypes :
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Overview
These files represent a special tabulation of the 2000 Census long-form data for use in transportation planning applications. As such, the tables have relevance to commuting information such as when people leave home for work, how they travel to work, how long it takes to get there, etc. There is also some custom geography found on these files such as TAZ's (Transportation Analysis Zones) and MPOs
(metropolitan planning organizations). There are 3 parts to this collection:
- Part 1 provides table summaries based on where people resided;
- Part 2 provides summaries of workers and work trips based on where people worked;
- Part 3 deals with dual geography, giving characteristics of commuters for specified origin-destination geographic combinations.
These data were prepared by the Census Bureau using specifications from the US Dept of Transportation (DOT), who are the distributors of the data and who are responsible for its content. We have downloaded and converted files for Missouri, Illinois and Kansas only.
For the official overview of this product from DOT with references to other online sites and cd-rom based access to the data see the About.pdf file in this (data/ctpp2000) directory.
According to this About.pdf file:
CTPP is the only Census product that summarizes data by place of work and provides information on the travel flow between home and work. This is not quite true, since the Census Bureau also did a special tab product that had simple counts of work flows at the county to county (and higher) levels. We have some of these data in our archive which can be accessed in the
workflow data directory.
Technical Documentation
We have copied the orginal Technical Documentation files that came with the data from DOT and stored it in a series of Techdoc subdirectories. While running uexplore against the ctpp2000 data directory (http://mcdc2.missouri.edu/cgi-bin/uexplore?/pub/data/ctpp2000) you can access these directories from the links at the top of the page. Most of what you need is in the Techdoc directory, which has the unusual structure of consisting almost entirely of Appendices. This is the documentation that accompanied the Part 1 data, but a lot of it applies to the entire collection. The Techdoc2 and Techdoc2 contain additional files that pertain specifically to parts 2 and 3, respectively.
Of course, the Missouri Census Data Center has done custom conversions of the raw datasets as they came to us from DOT/Census. The best technical documentation relating to the specifics of how we have converted and stored the data can be found by accessing the
Datasets.html page and then looking at the various Details page links for individual datasets.
Access Via the MoDOT SEIR Application
In addition to the standard generic extraction tools provided by uexplore/dexter you can also make use of a much more customized extraction system that OSEDA developed for the Missouiri Department of Transportion. As part of the MoDOT Socioeconomic Indicator Resource system there is a CTTP2000 Data Access Application that lets you select custom geography for Missouri (as well as Illinois and Kansas when Missouri MPOs include parts in those states). We developed custom extracts from the tables which can be accessed in various formats and the hmtl format reports have hyperlinks that will cause complete original tables to be displayed. As of the spring of 2005, we have only data from parts 1 and 2 available via this application.
Related Filetypes
Users who are familiar with the MCDC's approach to complex table files, whereby we attempt to distill
their contents into standard extract collections will understand what we have done in creating the
ctppx filetype. It is similar to the relationship that our sf32000x collection has with the sf32000 filetype. Except, perhaps, that the nature of these data really preclude the creation of stand-alone indicators. Instead,
the ctppx collection is still a set of tables, but they have been simplified and reduced. It is these extracted tables that comprise much of the data that is accessible via the MoDOT SEIR CTTP2000 Data Access application (see above).
The workflows filetype, already mentioned above, also has related data. This collection is greatly simplified, containing only
counts of workers commuting between geographic areas. Part 3 of the ctpp2000 collection has those counts as well as detailed characteristics of those commuters.
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