This data set was derived from the Lake Superior Watershed Boundary. A 50 km buffer was generated around the watershed boundary to account for factors outside of the watersheds which may influence the Lake Superior Basin. All states and provinces being part of a 50 km buffer of the Lake Superior Drainage Basin. This includes parts of Michigan, Wisconsin, Minnesota, and Ontario, Canada. Attributes appear to be fairly accurate. Limitations may only exist in the mapping of the watershed boundary. There are no known deficiencies in the data set. The Lake Superior Watershed boundary was buffered 50 km, as mentioned in the abstract. This was then used as our ‘clip coverage.’ Entity and attribute information is self-explanatory. There is only 6 attributes associated with lsb50: shape, area, perimeter, lsb50, lsb50-id, and inside. 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. to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in ‘Distribution Liability’ above. . 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 Source.