Transportation analysis zones are subdivisions of geographical areas that are delineated for land use and travel analysis purposes. This system is a modification of that developed jointly by the Minnesota Department of Transportation and the Metropolitan Council in late 1989, referred to as Transportation Analysis Zones, 1990 or TAZ1990. The principal difference between the 1990 and 2000 systems is that 27 TAZs were subdivided into smaller units, thus expanding the total number of TAZs from 1165 to 1201.
- The geography for this file is based on the Twin Cities Regional Travel Demand Forecast Model. Attributes included are population, households, total employment, retail employment, and non-retail employment for the years 2000, 2010, 2020 and 2030.
- As of early 2004, this set of TAZs became the official TAZ system for travel demand modeling, socioeconomic forecasts and community comprehensive plan development, in addition to its existing use for the 2000 Census Transportation Planning Package (CTPP).
- Where TAZs were split, significant boundary alignment differences exist between the 1990 and 2000 TAZ datasets.
- Generally, the 2000 TAZ system utilized 1998 TIGER line files for boundaries, which do not necessarily match the line files typically used with other Council generated GIS datasets. Because of this, some boundary lines take on a different appearance in instances where the more positionally accurate line doesn't follow acceptable TIGER boundary features.