This readme file is for the 1990 Census Files derived from the Special

Tabulation Product #214 (STP214). These files are the 1099-by-1099 regional

zone summaries from the final version of STP214 (April 1996).

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These four files are:

     RTAZFLOW.GR1    3003118 bytes -- Workers, Income quartile #1

     RTAZFLOW.GR2    5745490 bytes -- Workers, Income quartile #2

     RTAZFLOW.GR3    8069934 bytes -- Workers, Income quartile #3

     RTAZFLOW.GR4    6725438 bytes -- Workers, Income quartile #4



These files are zipped into the following four archives:

     RTAZG1.ZIP      347766 bytes

     RTAZG2.ZIP      651401 bytes

     RTAZG3.ZIP      907466 bytes

     RTAZG4.ZIP      755280 bytes

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The household income quartiles used in these files are as follows:

     1 - Less than $25,000

     2 - $25,000 to $44,999

     3 - $45,000 to $74,999

     4 - $75,000+



The codes for the means of transportation to work used in these files are

as follows:

     1 - All Means, Total

     2 - Drove alone

     3 - 2-person carpool

     4 - 3-person carpool

     5 - 4-or-more person carpool

     6 - Bus or trolleybus

     7 - Streetcar, trolley car, subway or elevated

     8 - Railroad or ferryboat

     9 - Bicycle

    10 - Walked

    11 - Taxicab, motorcycle or other means

    12 - Worked at Home



The file format for all files is as follows:

    1-3    County of Residence (Census codes)

    4-7    Place of Residence (Census codes)

    8-11   Zone of Residence (MTC 1099 zone system)

    12-14  County of Work (Census codes)

    15-18  Place of Work (Census codes)

    19-22  Zone of Work (MTC 1099 zone system)

    23-24  Income Quartile Code (1-4)

    25-26  Means of Transportation to Work Code (1-12)

    27-32  Number of Workers

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The raw, original data file for STP214 is also available from MTC. This

file is at the block group level for within the Bay Area and at the census

tract level for neighboring counties. The income and means of transportation

codes are the same as on these 1099 zone summary files.



Questions or comments on this data should be directed to Chuck Purvis of

MTC at (510) 464-7731, or e-mail: cpurvi@mtc.ca.gov.

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