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This page last updated: 05/19/2003
Metadata created using Minnesota Geographic Metadata Guidelines
| Originator | Metropolitan Council and The Lawrence Group (TLG) |
| Abstract | The Lawrence Group, under contract with Metropolitan Council, created a 1990 Census Bureau block polygon dataset for the Twin Cities Metropolitan Area (Anoka, Carver, Dakota, Hennepin, Ramsey, Scott and Washington Counties). This dataset is coincident with and developed using the TLG Street Centerline and Landmarks databases where 1990 block boundaries fall on those features. For those block boundaries that are defined by features not included in TLG databases, TLG used other digital resources to generate these boundaries, such as orthophotography or additional features from city and county GIS databases. TLG used it's best judgement to digitize block boundaries when the block boundaries followed nonvisible features or street extensions. This is a MetroGIS Regionally Endorsed dataset. |
| Browse Graphic | View a sample of the data. |
| Time Period of Content Date | 1990 |
| Currentness Reference | 1990 Census. Adjustment 1/17/01. |
| 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) - 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. |
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 and The Lawrence Group (TLG) | |||
| Title | Census Geography 1990 - TLG Aligned; Blocks, Block Groups & Tracts | |||
| Abstract | The Lawrence Group, under contract with Metropolitan Council, created a 1990 Census Bureau block polygon dataset for the Twin Cities Metropolitan Area (Anoka, Carver, Dakota, Hennepin, Ramsey, Scott and Washington Counties). This dataset is coincident with and developed using the TLG Street Centerline and Landmarks databases where 1990 block boundaries fall on those features. For those block boundaries that are defined by features not included in TLG databases, TLG used other digital resources to generate these boundaries, such as orthophotography or additional features from city and county GIS databases. TLG used it's best judgement to digitize block boundaries when the block boundaries followed nonvisible features or street extensions. This is a MetroGIS Regionally Endorsed dataset. |
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| Purpose | The dataset was developed to have a 1990 census block database that is aligned to the TLG street centerlines and landmarks files, for use in analysis which utilizes both the census data and TLG street centerlines/landmarks. Blockgroup and tract datasets have been desolved from the block dataset. Additionally, since TLG's street centerline dataset is aligned within county rights-of-way for these counties, this dataset allows for parcel based analysis as it may pertain to census blocks, block groups and tracts. This dataset is a precursor to creating a 2000 census block dataset when the 2000 TIGER/Line files are released by the Census Bureau. |
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| Time Period of Content Date | 1990 | |||
| Currentness Reference | 1990 Census. Adjustment 1/17/01. | |||
| Progress | Complete | |||
| Maintenance and Update Frequency | As needed | |||
| 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 |
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| Place Keywords | Twin Cities, Anoka County, Carver County, Dakota County, Hennepin County, Ramsey County, Scott County, Washington County | |||
| Theme Keywords | census, demographics, TIGER, blocks, block, block groups, block group, tracts, tract | |||
| 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. |
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| Contact Person Information | Tanya Mayer,
GIS Coordinator Metropolitan Council 390 Robert Street North St. Paul, Minnesota 55101-1805 Phone: 651-602-1604 FAX: 651-602-1674 E-mail: tanya.mayer@metc.state.mn.us | |||
| Browse Graphic | View a sample of the data. | |||
| Browse Graphic File Description | Sample map showing the census_1990_tlg layer. | |||
| Associated Data Sets | 1990 TIGER files from the Census Bureau TLG Street Centerlines - http://www.datafinder.org/metadata/tlg_roads.htm TLG Landmarks - http://www.datafinder.org/metadata/tlg_landmarks.htm |
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| Section 2 | Data Quality Information | Top of full metadata | Top of page | |
| Attribute Accuracy | Each block has a census block number assigned to it that represents the original Census block in the TIGER/Line file. Several small water blocks that have radically changed since the 1990 census are not included in this. Due to differences in accuracy and geographical representation, there are 22 land Census blocks not included in this file (most of these are small islands) and 6 Census blocks assigned to more than 1 polygon. For a more detailed list see the TLG90Miss-Dup-blks.xls file. Other than these cases, a one-to-one correspondence has been confirmed between this dataset and the 1990 census data. For a complete description of Census Bureau block numbering, please reference the TIGER Technical Documentation (prior to 2000 TIGER) at www.census.gov/geo/www/tiger |
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| Logical Consistency | Each county polygon file is topologically 'clean'. | |||
| Completeness | Entire seven county Twin Cities metro area is covered. | |||
| Horizontal Positional Accuracy | The positional accuracy of the dataset has not been tested under the National Standards for Spatial Data Accuracy. There are differing degrees of positional accuracy throughout the file. TLG adjusts the positional accuracy of the road boundary segments to available sources that are known to have a greater degree of accuracy than those used to generate the original data. However, in all cases (including instances where COGO line work has been the reference) TLG generalizes the segments to at most 4 feet in order to greatly reduce the number of vertices. Segments depicting road centerlines have been aligned or snapped to county provided COGO linework, Parcel data, street centerlines or right of ways. Where city boundaries are used as block boundaries, TLG has used the 'Counties and Minor Civil Divisions, Twin Cities Metropolitan Area' coverage which was developed by Metropolitan Council, Dakota, Hennepin, Scott & Washington Counties and the Minnesota Dept. of Transportation, unless there were differences from the 1990 census files due to annexations occurring after the 1990 Census boundaries were defined -- in which case, the 1990 MCD boundaries from TIGER were followed. |
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| Lineage | The Lawrence Group, under contract with Metropolitan Council, created this 1990 Census Bureau block polygon dataset for the Twin Cities Metropolitan Area (Anoka, Carver, Dakota, Hennepin, Ramsey, Scott and Washington Counties). This dataset is coincident with and developed using the TLG Street Centerline and Landmarks databases where 1990 block boundaries fall on those features. For those block boundaries that are defined by features not included in TLG databases, TLG used other digital resources to generate these boundaries, such as orthophotography or additional features from city and county GIS databases. TLG used it's best judgement to digitize block boundaries when the block boundaries followed nonvisible features or street extensions. After the data was received from TLG, Metropolitan Council GIS staff projected the coverages in to the current projection, added/standardized the attribute items, and created final shapefiles. |
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| Source Scale Denominator | ||||
| Section 3 | Spatial Data Organization Information | Top of full metadata | Top of page | |
| Native Data Set Environment | ArcInfo Version 8x, UNIX platform | |||
| Geographic Reference for Tabular Data | None | |||
| Spatial Object Type | Vector | |||
| Vendor Specific Object Types | arcs, nodes, polygons, label points | |||
| Tiling Scheme | One layer for entire seven county region in ArcView shape file format. | |||
| 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 | The polygon attribute table contains: |
| Entity and Attribute Detailed Citation | ||||
| Section 6 | Distribution Information | Top of full metadata | Top of page | |
| Publisher | Metropolitan Council | |||
| Publication Date | Unpublished material | |||
| Contact Person Information | Mark Kotz GIS Database Administrator Metropolitan Council Mears Park Centre, 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 |
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| Distributor's Data Set Identifier | census_1990_tlg | |||
| 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 | Arc Export files and ArcView Shape files | |||
| Transfer Format Version Number | ArcView: 3x | |||
| Transfer Size | 7.8 MB 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) - 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/ . |
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| 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 | 05/19/2003 | |||
| Contact Person Information | Tanya Mayer,
GIS Coordinator Metropolitan Council Mears Park Centre, 390 Robert Street North St. Paul, Minnesota 55101-1805 Phone: 651-602-1604 FAX: 651-602-1674 E-mail: tanya.mayer@metc.state.mn.us |
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| 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: 05/19/2003
