Section 1	Identification Information
Originator	U.S. Dept. of the Interior, U.S. Geological Survey National Mapping Division, National Topographic Data Base of Canada
Title	Great Lakes DEM
Abstract	This data set is a compilation of USGS and hybrid NTDB (National Topographic Data Base) of Canada information. Before the two sources were combined, the Canadian information was derived from elevation countours to create a DEM from the NTDB data set. It was later resampled to 1km resolution. After this data was assembled, it was clipped with the 50 km buffered basin boundary, and then split into counties on the US side. On the Canada side, the data was left whole. This was done to provide easier access for downloading the data sets.
Purpose	A base data layer.
Time Period of Content Date
Currentness Reference	Observed
Progress	Complete
Maintenance and Update Frequency	As needed
Spatial Extent of Data	Lake Superior Basin and 50 km buffer including: Ontario, Canada; Minnesota, Wisconsin, and Michigan
Bounding Coordinates	-97.293 -81.564 49.255 41.573
Place Keywords	Ontario, Canada, Michigan, Minnesota, Wisconsin
Theme Keywords	Digital Elevation Models
Theme Keyword Thesaurus	None
Access Constraints	None
Use Constraints	None
Contact Person Information	Mark White, Research Specialist Natural Resources Research Institute 5013 Miller Trunk Hwy Duluth, Minnesota 55811 Phone: (218)-720-2710 FAX: (218)-720-4328 E-mail: mwhite@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: Data were tested according to U.S.G.S. standards. See Digital Elevation Models -- Data Users Guide 5 for more information regarding accuracy. Canada: Contact NTDB, http://www.geocan.nrcan.gc.ca/ps/topoe.html
Logical Consistency	US: Data were tested according to U.S.G.S. standards. See Digital Elevation Models -- Data Users Guide 5 for more information regarding logical consistency. Canada: Contact NTDB, http://www.geocan.nrcan.gc.ca/ps/topoe.html
Completeness	US: See Digital Elevation Models Data Users Guide -- 5 for more information regarding completeness. Canada: Contact NTDB, http://www.geocan.nrcan.gc.ca/ps/topoe.html
Horizontal Positional Accuracy	US: See Digital Elevation Models -- Data Users Guide 5 Canada: Contact NTDB, http://www.geocan.nrcan.gc.ca/ps/topoe.html
Vertical Positional Accuracy	US: See Digital Elevation Models -- Data Users Guide 5 Canada: Contact NTDB, http://www.geocan.nrcan.gc.ca/ps/topoe.html
Lineage	US: Process Description: Data were downloaded via FTP from EROS Data Center, and imported to GRID format. Process Step Process Description: Data were projected to GLA Special Albers Conic projection. Process Date: 19960205 Canada: NRRI generated a Digital Elevation Model from elevation contours (canline, states) of the Lake Superior Basin with the Grid command 'topogrid.' NRRI used coverage lsb50 to limit the extent of the DEM to the Watershed, and river for the stream argument. Data was then clipped with the 50 km lake superior basin boundary, and split into county coverages for the US side. It was left whole for the canadian side.
Source Scale Denominator
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	Raster
Vendor Specific Object Types
Tiling Scheme	Counties
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
Cell Width	1000
Cell Height	1000
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 Type Label: Elevation Entity Type Definition: Elevation from 1:250,000-scale DEMs for Michigan, Wisconsin, and Minnesota Entity Type Definition Source: U.S. Dept. of Interior, U.S.G.S Attribute Attribute Label: Value Attribute Definition: Elevation in feet Attribute Definition Source: U.S. Dept. of Interior, U.S.G.S. Range Domain 560 Range Domain Minimum: 560 Range Domain Maximum: 2133 Entities and attributes are limited due to the nature of the coverage (DEM).
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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