Metadata: Streams Network Dissolved to Management Segments

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Streams Network Dissolved to Management Segments

This page last updated: 04/02/2003
Metadata created using Minnesota Geographic Metadata Guidelines

Metadata Summary

Originator	Metropolitan Council, DNR, Mn/DOT
Abstract	Layer depicts stream segments aggregated from the Stream Network data layer based on stream order and minor watershed boundaries. This aggregation of stream segments was originally developed for a regional natural resource inventory and assessment (NRIA) of the Twin Cities. See the Lineage section of this metadata for additional information. The layer covers the seven counties in the Twin Cities metropolitan area.
Browse Graphic	View a sample of the data.
Time Period of Content Date	1990
Currentness Reference	Much of the data is current as of the date of the corresponding USGS 7.5-minute topographic quadrangle map. Some features have been updated based on recent aerial photography (1997 and 2000). See the metadata for the Stream Network dataset for additional information.
Access Constraints	None
Use Constraints	None
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. 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/ .
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, it is recommended that the GIS Data include a copy of this disclaimer and this metadata.
Online Linkage	I AGREE to the notice in "Distribution Liability" above. Clicking to agree will begin the download process (See Ordering Instructions above for details.)

Full Metadata


Section 1	Identification Information		Top of page
Originator	Metropolitan Council, DNR, Mn/DOT
Title	Streams Network Dissolved to Management Segments
Abstract	Layer depicts stream segments aggregated from the Stream Network data layer based on stream order and minor watershed boundaries. This aggregation of stream segments was originally developed for a regional natural resource inventory and assessment (NRIA) of the Twin Cities. See the Lineage section of this metadata for additional information. The layer covers the seven counties in the Twin Cities metropolitan area.
Purpose	To aggregate stream features from the Stream Network data layer into segments that are more practical for regional level assessment and management.
Time Period of Content Date	1990
Currentness Reference	Much of the data is current as of the date of the corresponding USGS 7.5-minute topographic quadrangle map. Some features have been updated based on recent aerial photography (1997 and 2000). See the metadata for the Stream Network dataset for additional information.
Progress	Complete
Maintenance and Update Frequency	None planned
Spatial Extent of Data	Includes the Twin Cities 7 County Metropolitan Area. This includes the counties of Anoka, Carver, Dakota, Hennepin, Ramsey, Scott and Washington.
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	streams, rivers, ditches, drainage, storm sewers, hydrography, hydrology, water resourses
Theme Keyword Thesaurus	None
Access Constraints	None
Use Constraints	None
Contact Person Information	Steve Kloiber, Environmental Analyst Metropolitan Council Environmental Services Mears Park Centre, 390 Robert Street North St. Paul, Minnesota 55101 Phone: 651-602-1056 FAX: 651-602-1130 E-mail: steve.kloiber@metc.state.mn.us
Browse Graphic	View a sample of the data.
Browse Graphic File Description	Sample map showing the Streams Network Dissolved to Management Segments dataset
Associated Data Sets	- Stream Network - Mn/DOT Streams - National Wetlands Inventory Lakes and Wetlands - Mn/DNR 24K Streams - Mn/DNR Lakes - Water Features from 2000 Land Use Data - Natural Resource Inventory Table for Streams

Section 2	Data Quality Information	Top of full metadata	Top of page
Attribute Accuracy	unknown
Logical Consistency	The data are topologically correct and verified.
Completeness	The dataset is complete for the 89 USGS 7.5 minute quadrangles. Note that some additional drainage connections may be available from municipalities.
Horizontal Positional Accuracy	Positional accuracy for areas derived from 1:24,000 USGS maps cannot be assumed to exceed National Map Accuracy Standards for 1:24,000 scale maps (+/- 40 feet).
Lineage	APRIL 2000 The Streams Network layer was developed by taking the Mn/DOT steams layers from the Mn/DOT Base Maps series (digitized from 1:24,000 USGS quad maps) and connecting stream segments through lakes and wetlands. Breaks in stream network continuity and lake drainage were filled using a variety of data sources. Working in major watershed tiles, DNR lakes and wetlands (of NWI origin) were used to create connector arcs through these features. Further connections were interpreted by referencing 24k USGS Digital Raster Graphics, and, selectively, by analysis of DOQs produced by the Metropolitan Council. Subsurface drainage was added using maps and descriptions from numerous Watershed Management Organization reports and municipalities. To prepare the coverage for further processing, braided streams were removed from the network. The above named source materials were used to determine primary channels when choosing the appropriate arc to represent the stream. Finally, the major watersheds were joined together into one metropolitan area wide coverage. Topology was verified. Many of the original stream arcs did not coincide with lake shores. To ensure the presence of a node at every point where a lake connector and stream feature meet, an IDENTITY was performed with the lakes coverage. Attributes were updated appropriately. Once the network was determined to be complete, a network TRACE was run to verify connectivity and flag those arcs flowing in the wrong direction. Corrections were made so that the resulting stream network has all arcs flowing downhill, and connections are true. The original major watershed extents were clipped to the project area. This area is represented by a 300 meter buffered set of the 89 24k quads that intersect the minor watersheds intersecting the seven county metropolitan area. Many arcs remained isolated from the network. All those over 500 meters long were verified to flow in the right direction. Tolerance values for the coverage were set as follows: Fuzzy: 0.100 Dangle: 10.000 Verified Tic Match: 0.000 Edit: 10.000 Verified Node Snap: 10.000 Verified Weed: 1 Verified Grain: 10 Verified Snap: 3.000 Verified JULY 2000 DNR reviewed the metro streams product and conducted a comprehensive data quality review and editing process, focused primarily on data completeness issues. DNR staff used the 7.5 minute Digital Raster Graphics (DRG's) as the principal reference source during the editing process. DNR 24K Lakes were also used in the editing process. The work was conducted in ARC/INFO Workstation Version 8.02, using ARCEDIT. During the course of the work, numerous stream reaches were added and a variety of edits to existing features were made, including: extending streams, moving streams, deleting small spurious features, and snapping to lake polygon boundaries. DNR staff also tagged those features which are designated trout streams. Very few streams were actually deleted and redigitized during the process. Rather, the process was focused on making the data consistent with other portions of the DNR 24K Streams layer with regards to structure, content, and consistency of representation. JULY - SEPTEMBER 2002 To facilitate a management level assessment, stream features were aggregated into larger, relatively homogenous segments. The Strahler stream order was calculated for all arc features in this dataset using the Strahler extension downloaded from the ESRI script library. Met Council developed another script to find all connected stream arcs where the Strahler stream order was equal and assign a unique stream ID. Stream arcs were then dissolved (arcs were merged into larger segments) based on this unique stream ID. Streams longer than 10 km were manually split at DNR minor watershed boundaries and stream IDs were renumbered.
Source Scale Denominator	24000

Section 3	Spatial Data Organization Information	Top of full metadata	Top of page
Native Data Set Environment	ArcView 3.x
Geographic Reference for Tabular Data	None
Spatial Object Type	Vector
Vendor Specific Object Types	line shapes
Tiling Scheme	One layer for entire area.

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

STREAM_ID:  A unique numeric identifier for each stream segment.  Stream  
            segments were aggregated from the digitized features of the  
            original source data layer.  Stream features were aggregated  
            according to Strahler stream order and connectivity.  Initially,  
            all stream features that had the same stream order and were  
            connected in an upstream-downstream relationship were aggregated  
            using an ArcInfo dissolve process.  Stream segements longer than  
            10,000 meters were then manually split at DNR minor watershed  
            boundaries. 
 
COUNT:      A count of the number of features from the original data that were  
            aggregated to create the stream segment. 
 
OLD_ID:     The stream identification number from the first draft of the  
            aquatic assessment. 
 
STRAHLER:   The stream order number for each segment based on the Strahler  
            stream order system. 
 
LENGTH:     The length of the stream segment in meters. 
 
SPLIT:      A boolean variable (Y/N) that indicates if the segment was manually  
            split from a longer segment at the DNR minor watershed boundary.

Entity and Attribute Detailed Citation	None

Section 6	Distribution Information	Top of full metadata	Top of page
Publisher	Metropolitan Council
Publication Date	04/02/2003
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	StreamsNetworkDissolved
Transfer Format Name	Shapefile
Transfer Format Version Number	ArcGIS 8x
Transfer Size	2 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. 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/ .
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, it is recommended that the GIS Data include a copy of this disclaimer and this metadata.
Online Linkage	I AGREE to the notice in "Distribution Liability" above. Clicking to agree will begin the download process (See Ordering Instructions above for details.)

Section 7	Metadata Reference Information	Top of full metadata	Top of page
Metadata Date	04/02/2003
Contact Person Information	Steve Kloiber, Environmental Analyst Metropolitan Council Mears Park Centre, 390 Robert Street North St. Paul, Minnesota 55101-1805 Phone: 651-602-1056 FAX: 651-602-1130 E-mail: steve.kloiber@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: 04/02/2003