Metadata for the

Great Lakes DEM


Developed by

U.S. Dept. of the Interior, U.S. Geological Survey National Mapping Division, National Topographic Data Base of Canada


These metadata were created using the Minnesota Geographic Metadata Guidelines .


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

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


This page last updated 08/25/1999.

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The Lake Superior Decision Support project is coordinated through the Center for Water and the Environment at the Natural Resources Research Institute. The project is funded by the USEPA Region 5 Coastal Environmental Management Grant Program through the Minnesota Department of Natural Resources.  For comments on this project or this home page, contact George Host.  Last updated: Friday, January 18, 2002 11:43
The University of Minnesota is an equal opportunity educator and employer.
1999-2000 University of Minnesota Duluth
Natural Resources Research Institute
CWE
5013 Miller Trunk Highway
Duluth, MN 55811 (218)720.4294