Metadata: Transportation Analysis Zones: 1990

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Transportation Analysis Zones: 1990 - 2000

This page last updated: 11/03/2004
Metadata created using Minnesota Geographic Metadata Guidelines

Metadata Summary

Originator	Metropolitan Council
Abstract	Transportation analysis zones are subdivisions of geographical areas that are delineated for travel analysis and modeling purposes. They were initially created by the Minnesota Department of Transportation. The seven county Twin Cities region is divided into 1165 zones. In most cases TAZ boundaries align with Census block boundaries. Population and household data comes from the 1990 and 2000 Census and is aggregated to each TAZ. Employement data comes from the Minnesota Department of Economic Security and is also aggregated to each TAZ. Please note that as of early 2004, this set of TAZs was no longer being used for travel demand modeling, socioeconomic forecasts and community comprehensive plan development. Contact Bob Padock for more information (See contact person in Section 1 of this metadata). This dataset includes attributes from both 1990 and 2000 (see Section 5 for more information). Notes: - Residential and Employment density calculations are considered to be general numbers for trend analysis metro wide. Due to limitations in the positional accuracy of TAZ boundaries and generalized land use interpretation methods, it would be inappropriate to rely on the density figures to be an accurate reflection of the employment or residential density in any given TAZ. Also, the density relates to that part of the TAZ with the given type of land use, and not the TAZ as a whole. - In August of 2003, attributes for 2000 were added to the 1990 TAZ dataset to create this dataset. - The TAZ dataset that existed prior to August, 2003 (for 1990 only) was found to have some inaccuracies in some of the residential and employment density values. They have been corrected in this dataset. - On 12/29/2000 the boundaries of TAZs 629, 632 & 633 were corrected. - TAZ boundaries that are coincident with county and municipal boundaries do not match the more accurate county and municipal boundary layer used by the Metropolitan Council. - These 1990 TAZ boundaries have significant positional differences when compared to the 2000 boundaries of the same TAZes.
Browse Graphic	View a sample of the data.
Time Period of Content Date	1990
Currentness Reference	These TAZ boundaries were last updated for the 1990 Census. The attributes are for both 1990 and 2000.
Access Constraints	None
Use Constraints	By acceptance of this data, the user agrees to include a copy of this metadata record, including the liability disclaimer, whenever the user transmits or provides the GIS Data (or any portion of it) to another user. We recommend that other interested parties download this dataset from the Data Finder web site (www.datafinder.org) to ensure that the most current data is obtained.
Distributor Organization	Metropolitan Council
Ordering Instructions	This dataset is distributed on the internet by clicking below after 'Online Linkage'. Doing so will tell your browser to download a 'ZIP' file which will contain the following: - ArcView shape files - metadata for the dataset (.htm and .xml) - NOTICE.RTF, an important notice about this dataset that can be read by any word processing software. This dataset can also be viewed and downloaded from the MetroGIS DataFinder Cafe at http://www.datafinder.org/cafe/ . The Cafe allows users to subset or clip datasets using an existing feature, such as a city or school district boundary or an ad-hoc, user defined area. Additionally, this dataset is available for direct use via one or more map services. More information about what a web mapping service is can be found at http://www.datafinder.org/services/ . The specific map service and layer name for this dataset can be found by clicking the blue or green boxes under the map service column of the DataFinder Catalog at http://www.datafinder.org/catalog/ .
Online Linkage	Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" in Section 6 of this metadata.

Full Metadata

Transportation Analysis Zones: 1990 - 2000

Go to Section:
1. Identification Information
2. Data Quality Information
3. Spatial Data Organization Information
4. Spatial Reference Information
5. Entity and Attribute Information
6. Distribution Information
7. Metadata Reference Information


Section 1	Identification Information		Top of page
Originator	Metropolitan Council
Title	Transportation Analysis Zones: 1990 - 2000
Abstract	Transportation analysis zones are subdivisions of geographical areas that are delineated for travel analysis and modeling purposes. They were initially created by the Minnesota Department of Transportation. The seven county Twin Cities region is divided into 1165 zones. In most cases TAZ boundaries align with Census block boundaries. Population and household data comes from the 1990 and 2000 Census and is aggregated to each TAZ. Employement data comes from the Minnesota Department of Economic Security and is also aggregated to each TAZ. Please note that as of early 2004, this set of TAZs was no longer being used for travel demand modeling, socioeconomic forecasts and community comprehensive plan development. Contact Bob Padock for more information (See contact person in Section 1 of this metadata). This dataset includes attributes from both 1990 and 2000 (see Section 5 for more information). Notes: - Residential and Employment density calculations are considered to be general numbers for trend analysis metro wide. Due to limitations in the positional accuracy of TAZ boundaries and generalized land use interpretation methods, it would be inappropriate to rely on the density figures to be an accurate reflection of the employment or residential density in any given TAZ. Also, the density relates to that part of the TAZ with the given type of land use, and not the TAZ as a whole. - In August of 2003, attributes for 2000 were added to the 1990 TAZ dataset to create this dataset. - The TAZ dataset that existed prior to August, 2003 (for 1990 only) was found to have some inaccuracies in some of the residential and employment density values. They have been corrected in this dataset. - On 12/29/2000 the boundaries of TAZs 629, 632 & 633 were corrected. - TAZ boundaries that are coincident with county and municipal boundaries do not match the more accurate county and municipal boundary layer used by the Metropolitan Council. - These 1990 TAZ boundaries have significant positional differences when compared to the 2000 boundaries of the same TAZes.
Purpose	The transportation analysis zones layer was developed as a means to compile, analyze and exhibit demographic data and data related to capacity to produce travel. The primary analysis is the magnitude of tripmaking created within each TAZ and the interaction of these trips between the various zones within the region.
Time Period of Content Date	1990
Currentness Reference	These TAZ boundaries were last updated for the 1990 Census. The attributes are for both 1990 and 2000.
Progress	Complete
Maintenance and Update Frequency	None planned
Spatial Extent of Data	Twin Cities 7 County Metropolitan Area. This includes the counties of Anoka, Carver, Dakota, Hennepin, Ramsey, Scott and Washington in Minnesota.
Bounding Coordinates	-94.012 -92.732 45.415 44.471
Place Keywords	Twin Cities, Anoka County, Carver County, Dakota County, Hennepin County, Ramsey County, Scott County, Washington County
Theme Keywords	Transportation Analysis Zones, Traffic Assignment Zones, Traffic Analysis Zones, employment, jobs, population, households, density, transportation, demographics
Theme Keyword Thesaurus	None
Access Constraints	None
Use Constraints	By acceptance of this data, the user agrees to include a copy of this metadata record, including the liability disclaimer, whenever the user transmits or provides the GIS Data (or any portion of it) to another user. We recommend that other interested parties download this dataset from the Data Finder web site (www.datafinder.org) to ensure that the most current data is obtained.
Contact Person Information	Bob Paddock, Planner Metropolitan Council 390 Robert Street North St. Paul, Minnesota 55101-1805 Phone: 651-602-1340 FAX: 651-602-1674 E-mail: bob.paddock@metc.state.mn.us
Browse Graphic	View a sample of the data.
Browse Graphic File Description	Sample map showing the taz_1990-2000 layer.
Associated Data Sets	Transportation Analysis Zones for External Counties ( http://www.datafinder.org/metadata/taz_ext.htm ) Metropolitan Council Generalized Land Use (( http://www.datafinder.org/metadata/luse_hist.htm )

Section 2	Data Quality Information	Top of full metadata	Top of page
Attribute Accuracy	The TAZ dataset that existed prior to August, 2003 (for 1990 only) was found to have some inaccuracies in some of the residential and employment density values. They have been corrected in this dataset.
Logical Consistency	The dataset is topologically 'clean'.
Completeness	Entire seven county geographic area is covered.
Horizontal Positional Accuracy	The positional accuracy of the dataset has not been tested under the National Standards for Spatial Data Accuracy. The positional accuracy of the dataset is UNKNOWN. Boundary lines are generally based on 1990 Census block boundaries. TAZ boundaries that are coincident with county and municipal boundaries do not match the more accurate county and municipal boundary layer used by the Metropolitan Council.
Lineage	TAZ GEOGRAPHY: The TAZ layer was created initially by staff at the Minnesota Department of Transportation. The layer was imported into an Arc/Info environment at the Metropolitan Council in the mid 1990s. Since that time the Council has modified the attributes in the layer, but not the geography. POPULATION AND EMPLOYMENT VALUES: The population and household data for each TAZ is aggregated from block level census data. In most cases, census blocks fit neatly into each TAZ. In the few cases where they did not, a determination was made as to the appropriate TAZ in which to include the block, based on the general location of population within the block. Employment data was recieved from the Minnesota Department of Economic Security MNDES. For 1990, MNDES aggregated the employment data to each TAZ. For 2000, MNDES provided the Metropolitan Council a file of employer address that the Metropolitan Council address matched and aggregated to each TAZ. In a few cases, the employment numbers for a TAZ did not meet the discloser thresholds required by MNDES. In such cases, the numbers were adjusted with a neighboring TAZ to prevent disclosure. This was more common with retail employment numbers than with total employment. RESIDENTIAL AND EMPLOYMENT ACRES: The residential and employment acres for each TAZ were derived from the Metropolitan Council's Generalized Land Use dataset. (See http://www.datafinder.org/metadata/landuse_hist.htm for more information.) The acreages consist of the following land use classes for each year (Note: Land use categories differed in the two years): 1990 Residential: 1 = Single Family 2 = Muli-family 11 = Farmstead 1990 Employment: 3 = Commercial 4 = Industrial 5 = Public Semi-Public 6 = Airports 2000 Residential: 111 = Farmstead 112 = Seasonal/Vacation 113 = Single Family Detached 114 = Single Family Attached 115 = Multifamily 116 = Manufactured Housing Parks 2000 Employment: 120 = Retail and Other Commercial 130 = Office 141 = Mixed Use Residential 142 = Mixed Use Industrial 143 = Mixed Use Commercial and Other 151 = Industrial and Utility 160 = Institutional 203 = Airport See the Generalized Land Use metadata at http://www.datafinder.org/metadata/landuse_hist.htm#eainfo for a more detailed description of these land use classes. RESIDENTIAL AND EMPLOYMENT DENSITY Residential and Employment density calculations are considered to be general numbers for trend analysis metro wide. Due to limitations in the positional accuracy of TAZ boundaries and generalized land use interpretation methods, it would be inappropriate to rely on the density figures to be an accurate reflection of the employment or residential density in any given TAZ. The density relates to that part of the TAZ with the given type of land use, and not the TAZ as a whole. Some density values may be very skewed do to positional accuracy issues with the alignment of TAZ boundaries as compared to the land use data.
Source Scale Denominator

Section 3	Spatial Data Organization Information	Top of full metadata	Top of page
Native Data Set Environment	ArcGIS 8x
Geographic Reference for Tabular Data	TAZ ID number
Spatial Object Type	Vector
Vendor Specific Object Types	polygon shapes
Tiling Scheme	One layer for entire seven county region.

Section 4	Spatial Reference Information	Top of full metadata	Top of page
Horizontal Coordinate Scheme	UTM
Ellipsoid	GRS80
Horizontal Datum	NAD83
Horizontal Units	Meters
Distance Resolution
UTM Zone Number	15

Section 5	Entity and Attribute Information	Top of full metadata	Top of page

Entity and Attribute Overview

POLYGON ATTRIBUTES: 
  
TAZ_1990:   The ID developed for each 1990 TAZ 
  
POP_1990:   Population within the TAZ  (Source: 1990 Census) 
  
HH_1990:    Households within the TAZ  (Source: 1990 Census) 
  
EMP_1990:   Employment (jobs) within the TAZ  (Source: MN Dept. of Economic  
            Security) 
  
RET_1990:   Retail employment within the TAZ  (Source: MN Dept. of Economic  
            Security) 
 
NRET_1990:  Non-retail employment within the TAZ (EMP_1990 - RET_1990) 
 
RES_AC_90:  Total acreage of the TAZ that is residential usage.  See Lineage in  
            Section 2 of this metadata for more information.  (Source:  1990  
            Metropolitan Council Generalized Land Use data) 
  
EMP_AC_90:  Total acreage of the TAZ that is commercial, industrial or other  
            employment uses.  See Lineage in Section 2 of this metadata for  
            more information. (Source:  1990 Metropolitan Council Generalized  
            Land Use data) 
  
RES_DEN_90: Residential density 1990, expressed as households per acres of  
            residential area (HH_1990/RES_AC_90).  See Lineage in Section 2 of  
            this metadata for more information. 
  
EMP_DEN_90: Employment density 1990, expressed as jobs per acre of employment  
            area (EMP_1990/EMP_AC_90).  See Lineage in Section 2 of this  
            metadata for more information. 
  
POP_2000:   Population within the TAZ  (Source: 2000 Census) 
  
HH_2000:    Households within the TAZ  (Source: 2000 Census) 
  
EMP_2000:   Employment (jobs) within the TAZ  (Source: MN Dept. of Economic  
            Security) 
  
RET_2000:   Retail employment within the TAZ  (Source: MN Dept. of Economic  
            Security) 
 
NRET_2000:  Non-retail employment within the TAZ (EMP_2000 - RET_2000) 
 
RES_AC_2K:  Total acreage of the TAZ that is residential usage.  See Lineage in  
            Section 2 of this metadata for more information.  (Source: 2000  
            Metropolitan Council Generalized Land Use data) 
  
EMP_AC_2K:  Total acreage of the TAZ that is commercial, industrial or other  
            employment uses.  See Lineage in Section 2 of this metadata for  
            more information. (Source:  2000 Metropolitan Council Generalized  
            Land Use data) 
  
RES_DEN_2K: Residential density 2000 expressed as households per acres of  
            residential area (HH_2000/RES_AC_2K).  See Lineage in Section 2 of  
            this metadata for more information. 
  
EMP_DEN_2K: Employment density 2000 expressed as jobs per acre of employment  
            area (EMP_2000/EMP_AC_2K).  See Lineage in Section 2 of this  
            metadata for more information. 
 
ACRES:      Acreage of the TAZ polygon 
 
CO_NAME:    Name of the county in which the TAZ resides (e.g. RAMSEY)

Entity and Attribute Detailed Citation

Section 6	Distribution Information	Top of full metadata	Top of page
Publisher	Metropolitan Council
Publication Date	08/07/2003
Contact Person Information	Mark Kotz GIS Database Administrator Metropolitan Council 390 Robert Street North St. Paul, Minnesota 55101-1805 Phone: 651-602-1644 FAX: 651-602-1674 E-mail: mark.kotz@metc.state.mn.us
Distributor's Data Set Identifier	taz_1990-2000
Distribution Liability	NOTICE: The Geographic Information System (GIS) Data to which this notice is attached are made available pursuant to the Minnesota Government Data Practices Act (Minnesota Statutes Chapter 13). THE GIS DATA ARE PROVIDED TO YOU AS IS AND WITHOUT ANY WARRANTY AS TO THEIR PERFORMANCE, MERCHANTABILITY, OR FITNESS FOR ANY PARTICULAR PURPOSE. The GIS Data were developed by the Metropolitan Council for its own internal business purposes. The Metropolitan Council does not represent or warrant that the GIS Data or the data documentation are error-free, complete, current, or accurate. You are responsible for any consequences resulting from your use of the GIS Data or your reliance on the GIS Data. You should consult the data documentation for this particular GIS Data to determine the limitations of the GIS Data and the precision with which the GIS Data may depict distance, direction, location, or other geographic features. If you transmit or provide the GIS Data (or any portion of it) to another user, the GIS Data must include a copy of this disclaimer.
Transfer Format Name	Shape File
Transfer Format Version Number	ArcGIS 8x
Transfer Size	1 meg. for ZIP file.
Ordering Instructions	This dataset is distributed on the internet by clicking below after 'Online Linkage'. Doing so will tell your browser to download a 'ZIP' file which will contain the following: - ArcView shape files - metadata for the dataset (.htm and .xml) - NOTICE.RTF, an important notice about this dataset that can be read by any word processing software. This dataset can also be viewed and downloaded from the MetroGIS DataFinder Cafe at http://www.datafinder.org/cafe/ . The Cafe allows users to subset or clip datasets using an existing feature, such as a city or school district boundary or an ad-hoc, user defined area. Additionally, this dataset is available for direct use via one or more map services. More information about what a web mapping service is can be found at http://www.datafinder.org/services/ . The specific map service and layer name for this dataset can be found by clicking the blue or green boxes under the map service column of the DataFinder Catalog at http://www.datafinder.org/catalog/ .
Online Linkage	Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" above.

Section 7	Metadata Reference Information	Top of full metadata	Top of page
Metadata Date	11/03/2004
Contact Person Information	Mark Kotz, GIS Database Administrator Metropolitan Council 390 Robert Street North St. Paul, Minnesota 55101-1805 Phone: 651-602-1644 FAX: 651-602-1674 E-mail: mark.kotz@metc.state.mn.us
Metadata Standard Name	Minnesota Geographic Metadata Guidelines
Metadata Standard Version	1.2
Metadata Standard Online Linkage	http://www.gis.state.mn.us/stds/metadata.htm

This page last updated: 11/03/2004