Section 1	Identification Information
Originator	US Geological Survey (LUDA) - US side, Environment Canada/Sensitivity Mapping Program 1996 - Canadian side
Title	Hydrography for the Lake Superior Basin
Abstract	This data set consists mostly of polygons taken from USGS landuse/landcover files and Environment Canada to create a basin-wide hydrography coverage. This data was clipped with a 50 km buffer of the Lake Superior Drainage basin, and then split into counties for the US side, and kept whole for the Canada side. The coverage displays most major lakes and water-bodies. For the fields 'time period of content and source scale denominator' the US information was used. The Canada information is 1996, and 250000, respectively. See readme file.
Purpose	A base data layer.
Time Period of Content Date	1976
Currentness Reference	Date of oldest program data (from USGS information)
Progress	Complete
Maintenance and Update Frequency	As needed
Spatial Extent of Data	Lake Superior Basin, including parts of Minnesota, Michigan, Wisconsin, and Ontario, Canada
Bounding Coordinates	-97.293 -81.564 49.255 41.573
Place Keywords	Minnesota, Michigan, Wisconsin, and Ontario
Theme Keywords	hydro, lakes, reservoirs, forested wetlands, non-forested wetlands
Theme Keyword Thesaurus	None
Access Constraints	None
Use Constraints	None
Contact Person Information	Gerald Sjerven, GIS Specialist Natural Resources Research Institute 5013 Miller Trunk Hwy Duluth, Minnesota 55811 Phone: (218)-720-4388 FAX: (218)-720-4328 E-mail: gsjerven@sage.nrri.umn.edu
Browse Graphic File Name	none available
Browse Graphic File Description
Associated Data Sets
Section 2	Data Quality Information - - - - - - Go back to top
Attribute Accuracy	US side: Contact USGS EROS Data Center, www.usgs.org Canada: Accuracy of geometric representation data is given by the difference between the position of the geometric representation associated with an entity and the real position of the corresponding topographic feature, as measured with respect to the geodetic network. Ancillary data give an indication of the quality of the NTDB topographic data. Among these ancillary data, one will find the accuracy as determined from the data acquisition process.
Logical Consistency	US side: Polygon and chain-node topology present. Canada side: None available
Completeness	US side: See entity and attribute overview, and lineage Canada side: None available
Horizontal Positional Accuracy	US side: None available, contact USGS EROS Data Center, www.usgs.org Canada side: None available
Vertical Positional Accuracy	Not applicaple
Lineage	US side: The LUDA data was downloaded as 16 tiles, converted to coverages, and mapjoined. The codes for lakes, reservoirs, bays and estuaries, forested wetlands, non-forested wetlands, intermittent/slough, waterbody, and wetlands were taken from the LUDA data. All excess items were dropped and the coverages were modified so that both the US LUDA data and the Canadian data could be merged together. Canada side: Each 1:250,000 quad was converted to a shapefile using mifshape. The shapefiles were then merged in Arcview. The shoreline and islands were extracted. Both the US and Canadian data were converted from shapefiles to Arc coverages and merged together. Then, a 50 km buffer of the Lake Superior Basin Boundary was used to clip out the relevant area. The data then was split into counties for the US side, and kept whole on the Canada side.
Source Scale Denominator	100000
Section 3	Spatial Data Organization Information - - - - - - Go back to top
Native Data Set Environment	UNIX-ARC/INFO Ver. 7.1.2, Sun Solaris operating system
Geographic Reference for Tabular Data	None
Spatial Object Type	Vector
Vendor Specific Object Types	Polygon, area
Tiling Scheme	US side: counties, Canada: canada-wide
Section 4	Spatial Reference Information - - - - - - Go back to top
Horizontal Coordinate Scheme	Geographic (Lat. Long.)
Ellipsoid	GRS80
Horizontal Datum	NAD83
Horizontal Units	Meters
Distance Resolution
Altitude Datum	Not applicable
Depth Datum	Not applicable
Map Projection Name	Albers Equal Area
Map Projection Parameters	Standard Parallel: 29.5 Standard Parallel: 45.5 Longitude Of Central Meridian: -96 Latitude Of Projection Origin: 23 False Easting: 0 False Northing: 0
Other Coordinate System's Definition	Planar Coordinate Encoding Method: Coordinate Pair Abscissa Resolution: 1 Ordinate Resolution: 1 Semi-Major Axis: 6378206.4 Denominator of Flattening Ratio: 294.98
Section 5	Entity and Attribute Information - - - - - - Go back to top
Entity and Attribute Overview	Entity and attribute information is self explanatory. There are the typical attributes such as shape, length, etc. The fields 'hydrocode' and 'hydroclass' compliment each other as follows: 21= no data or unknown 43= no data or unknown 51= no data or unknown 52= lakes 53= reservoirs 54= bays and estuaries 61= forested wetlands 62= non-forested wetlands 75= no data or unknown 1450= waterbody: intermittent/slough 1452= waterbody 1492= wetland See lineage.
Entity and Attribute Detailed Citation	None
Section 6	Distribution Information - - - - - - Go back to top
Publisher	Natural Resources Research Institute
Publication Date	Unpublished material
Contact Person Information	Gerald Sjerven, GIS Specialist Natural Resources Research Institute 5013 Miller Trunk Hwy Duluth, Minnesota 55811 Phone: (218)-720-4388 FAX: (218)-720-4328 E-mail: gsjerven@sage.nrri.umn.edu
Distributor's Data Set Identifier
Distribution Liability	No warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The University of Minnesota shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Transfer Format Name	ARC/Info export format
Transfer Format Version Number
Transfer Size
Ordering Instructions
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 - - - - - - Go back to top
Metadata Date	08/25/1999
Contact Person Information	Joel Nelson, GIS Intern Natural Resource Research Institute 5013 Miller Trunk Highway Duluth, Minnesota 55811 Phone: (218)-720-4254 FAX: (218)-720-4328 E-mail: jnelson@sage.nrri.umn.edu
Metadata Standard Name	Minnesota Geographic Metadata Guidelines
Metadata Standard Version	Datalogr 2.01
Metadata Standard Online Linkage	http://www.lmic.state.mn.us/gc/stds/metadata.htm

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