This test file provides users with the opportunity to test ...
README File for Census 2000 Redistricting Files Delivered via FTP
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|Note: Users processing these FTP files in a Windows environment should read carefully the File Information section of this document. |
About the FTP Application
This FTP (File Transfer Protocol) application is intended for experienced users of census data, compressed files, and spreadsheet/database software. It provides quick access to data users, such as State Data Centers and news media, who need to begin their analysis immediately upon data release. Due to the size of the files, the FTP user should have a fast file transfer capability.
Each state directory provides all files available for the identified state. Once uncompressed, the data are in a flat ASCII format. The geographic file is in a fixed-field format; the two data files are in comma delimited format. No software is provided. Users of the FTP application need to unzip the compressed file after downloading, then import it into the spreadsheet/database software of their choice for data analysis and table presentation.
Other Sources of the Data
The Census Bureau releases most Census 2000 data on a state-by-state basis. Tables are available in American FactFinder (factfinder.) upon release of the designated state file. Within American FactFinder, individual tables can be downloaded in a text delimited or comma delimited format.
For users without immediate need for the data, CD-ROMs containing the data and access software are scheduled for shipping shortly after the state file release. They can be ordered from the Census Bureau?s Customer Services Center at 301-457-4100.
FTP Directory
The FTP directory is at . When the Census 2000 redistricting data are added to their respective directories, each state directory has three data files, reflecting the three data segments. See below for more information on the data segments.
File Information
Once uncompressed, these files are in flat ASCII format. The geographic header file (see below) contains fixed fields while the data files (File01 and File02, see below), including the geographic link fields, are in comma-delimited format. These files have been constructed in a UNIX environment. They use an ASCII linefeed, chr(10), to indicate a new record.
For successful use with many programs running in a Windows environment, these files need to be modified to use the ASCII carriage return/linefeed sequence, chr(13) + chr(10) as a record terminator. This is an easy step in the UnZIP process using any UnZIP software which offers the conversion option. We tested PKZIP for Windows, version 4.00 following the steps outlined below. This PKZIP shareware can be downloaded from . After installing PKZIP, do the following:
--Select the file
--Select the Extract option on the tool bar
--Select the options button at the bottom of the Extract page
--Under the Miscellaneous section, select the "DOS - convert to CR/LF"
The resulting file will meet the ANSI MS-DOS/Windows standard used by Access 97 and other MS Windows-based programs. If the data are being processed in a UNIX environment, they can be unzipped using any standard ZIP/UnZIP package.
These FTP data are available as compressed files at the 90% (approximately) file compression ratio. We estimate that an average state FTP download (at 56K bps) of the redistricting data will take approximately 2 hours. Larger states, of course, will take longer. Our estimate for an FTP download for California is approximately 8 hours at the 56K bps speed. If you are using a modem/telephone line link to the Internet, we do not recommend using the FTP option.
Segmented Data
The data in the redistricting files and other Census 2000 summary files are segmented. This is done so that individual files will not have more than 255 fields, facilitating exporting into spreadsheet or database software. In short, to get the complete data set for the redistricting files, users must FTP all three files in the state directory.
These test files contain:
Geographic Header file
File01 (Tables 1 and 2)
File02 (Tables 3 and 4)
It is easiest to think of the file set as a logical file. However, this logical file consists of three physical files: the geographic header file, file01, and file02. This structure is a change from previous decennial census files.
The explanation below for linking the three redistricting test files requires specific location information for the geographic header. These are located in Chapter 7 of the Technical Documentation . A unique logical record number (LOGRECNO in the geographic header) is assigned to all files for a specific geographic entity; all records for that entity can be linked together across files. Additional identifying fields are also carried over from the geographic header file to the table files. These are file identification (FILEID), state/U.S. abbreviation (STUSAB), characteristic iteration (CHARITER), characteristic iteration file sequence number (CIFSN).
The geographic header record layout is identical across all electronic data products from Census 2000. Since the redistricting data files are quite simple, some of the fields, including some geographic header fields that appear in all three files (geographic header, tables 1/2, and tables 3/4) are not used. For example, the character iteration (CHARITER) field is only used in SF2/SF4. In the redistricting data file, it is always coded as 000.
File Record Layout
For a layout of the individual tables for each file, see . Select Chapter 6, Summary Table Outlines.
Estimated File Sizes
State Geo file File 1 File 2
unzipped zipped unzipped zipped unzipped zipped
Alabama 80M 6M 64M 2M 64M 2M
Alaska 11M .8M 9M .4M 9M. 3M
Arizona 70M 5M 55M 2M 55M 2M
Arkansas 68M 5M 53M 2M 53M 2M
California 234M 16M 186M 12M 186M 113M
Colorado 68M 5M 54M 3M 54M 3M
Connecticut 26M 2M 20M 2M 20M 2M
Delaware 9M .6M 7M .3M 7M .3M
District of
Columbia 3M .2M 2M .2M 2M .2M
Florida 155M 10M 123M 6M 123M 6M
Georgia 100M 7M 79M 4M 79M 4M
Hawaii 10M .6M 7M .6M 7M .6M
Idaho 40M 3M 31M .9M 31M .9M
Illinois 190M 13M 151M 6M 151M 6M
Indiana 100M 7M 78M 3M 78M 3M
Iowa 79M 6M 62M 2M 62M 2M
Kansas 80M 6M 64M 2M 64M 2M
Kentucky 53M 4M 42M 2M 42M 2M
Louisiana 71M 5M 56M 2M 56M 2M
Maine 25M 2M 19M .6M 19M .6M
Maryland 41M 3M 32M 2M 32M 2M
Massachusetts 53M 4M 42M 3M 42M 3M
Michigan 125M 9M 98M 5M 98M 5M
Minnesota 95M 7M 75M 3M 75M 3M
Mississippi 65M 5M 50M 2M 50M 2M
Missouri 115M 8M 90M 3M 90M 3M
Montana 41M 3M 32M .8M 32M .8M
Nebraska 62M 5M 50M 2M 50M 2M
Nevada 30M 2M 25M 1M 25M 1M
New
Hampshire 15M 1M 12M .5M 12M .5M
New Jersey 75M 5M 60M 4M 60M 4M
New Mexico 60M 4M 50M 2M 50M 2M
New York 162M 11M 130M 7M 130M 7M
North Carolina 110M 8M 90M 4M 90M 4M
North Dakota 39M 3M 30M .6M 30M .6M
Ohio 125M 9M 100M 5M 100M 5M
Oklahoma 81M 6M 64M 3M 64M 3M
Oregon 66M 5M 51M 2M 51M 2M
Pennsylvania 160M 12M 125M 5M 125M 5M
Rhode Island 10M .7M 8M .4M 8M .4M
South Carolina 68M 5M 53M 2M 53M 2M
South Dakota 37M 3M 30M .7M 30M .7M
Tennessee 85M 6M 68M 3M 68M 3M
Texas 310M 22M 245M 11M 245M 11M
Utah 37M 3M 30M 1M 30M 1M
Vermont 11M .8M 9M .3M 9M .3M
Virginia 70M 5M 55M 3M 55M 3M
Washington 92M 6M 73M 4M 73M 4M
West Virginia 40M 3M 32M 1M 32M 1M
Wisconsin 90M 7M 70M 3M 70M 3M
Wyoming 30M 2M 23M .5M 23M .5M
Puerto Rico 33M 2M 27M 1M 27M 1M
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