These data were created as part of the National Oceanic and Atmospheric Administration Office for Coastal Management's efforts to create an online mapping viewer called the NOAA Lake Level Viewer. It depicts potential lake level rise and fall and its associated impacts on the nation's coastal areas. The purpose of the mapping viewer is to provide coastal managers and scientists with a preliminary look at lake level change, coastal flooding impacts, and exposed lakeshore. The viewer is a screening-level tool that uses nationally consistent data sets and analyses. Data and maps provided can be used at several scales to help gauge trends and prioritize actions for different scenarios. The NOAA Lake Level Viewer may be accessed at: https://coast.noaa.gov/llv.

This metadata record describes the Lake Michigan digital elevation model (DEM), which is a part of a series of DEMs produced for the National Oceanic and Atmospheric Administration Office for Coastal Management's Lake Level Viewer described above. This DEM includes the best available lidar, US Army Corps of Engineer dredge surveys, and National Park Service multibeam data known to exist at the time of DEM creation that met project specifications. This DEM includes data for Allegan, Antrim, Benzie, Berrien, Charlevoix, Delta, Emmet, Grand Traverse, Leelanau, Mackinac, Manistee, Mason, Menominee, Muskegon, Oceana, Ottawa, Schoolcraft, and Van Buren counties in Michigan; Lake, La Porte, and Porter Counties in Indiana, Cook and Lake Counties in Illinois, and Brown, Door, Kenosha, Kewaunee, Manitowoc, Marinette, Milwaukee, Oconto, Ozaukee, Racine, and Sheboygan Counties in Wisconsin.

  The DEM was produced from the following lidar data sets:
  1. 2016 NOAA Topobathy Lidar: Upper Lake Michigan Islands 
  2. 2015 FEMA Marinette County
  3. 2013 Indiana Statewide Lidar Collection: Lake, La Porte, Tippecanoe, Newton, Jasper and Porter County Buy-Up
  4. 2013 Muskegon County, Michigan Lidar Co-Op
  5. 2013 USACE NCMP Topobathy Lidar: Lake Michigan North (MI)
  6. 2012 USACE NCMP Topobathy Lidar: Lake Michigan (MI,WI)
  7. 2012 USACE NCMP Topobathy Lidar: Lake Michigan (IL,IN,MI,WI)
  8. 2010 Brown County Lidar     
  9. 2008 USACE NCMP Topobathy Lidar: Lake Michigan (IN)
 10. 2008 USACE NCMP Topobathy Lidar: Lake Michigan (WI)
 11. 2008 USACE NCMP Topobathy Lidar: Lake Michigan (IL)
 12. 2008 USACE NCMP Topobathy Lidar: Lake Michigan (MI)
 13. 2007 USACE NCMP Topobathy BE Lidar: Lake Michigan (MI) and Lake Erie (PA)
 14. 2007 ARRA Lidar: Lake County (IL)
 15. 2006 USACE NCMP Topobathy Lidar: Lake Michigan (IN), Lake Erie (OH,PA), Lake Huron (MI)

  The DEM was produced from the following sonar data sets:
 16. 2015 USACE Detroit District, Port Washington Harbor, WI
 17. 2015 USACE Detroit District, South Haven Harbor, MI
 18. 2015 USACE Detroit District, Washington Island (Detroit Harbor), WI
 19. 2015 USACE Detroit District, Washington Island (Jackson Harbor), WI
 20. 2015 USACE Detroit District, Grand Haven Harbor, MI
 21. 2015 USACE Detroit District, Pentwater Harbor, MI
 22. 2015 USACE Detroit District, Pensaukee Harbor, WI
 23. 2015 USACE Detroit District, St. Joseph Harbor, MI
 24. 2015 USACE Detroit District, Manistee Harbor, MI
 25. 2015 USACE Detroit District, Green Bay Harbor, WI
 26. 2015 USACE Detroit District, Saugatuck Harbor, MI
 27. 2015 USACE Detroit District, Oconto Harbor, WI
 28. 2015 USACE Detroit District, White Lake Harbor, MI
 29. 2015 USACE Detroit District, Manistique Harbor, MI
 30. 2014 USACE Detroit District, Milwaukee Harbor, WI
 31. 2014 USACE Detroit District, Frankfort Harbor, MI
 32. 2014 USACE Detroit District, St. Joseph Harbor, MI
 33. 2014 USACE Detroit District, Holland Harbor, MI
 34. 2014 USACE Chicago District, Burns Waterway Harbor, IN
 35. 2014 USACE Chicago District, Burns Small Boat Harbor, IN
 36. 2014 USACE Chicago District, Michigan City, IN
 37. 2014 USACE Chicago District, Waukegan Harbor, IL
 38. 2014 USACE Chicago District, Calumet River, IL
 39. 2014 USACE Detroit District, Menominee Harbor, MI/WI

  The DEM was produced from the following NPS multibeam sonar data sets:
 40. 2011, National Park Service, Sleeping Bear Dunes National Lakeshore Multibeam Sonar
 41. 2012, National Park Service, Sleeping Bear Dunes National Lakeshore Multibeam Sonar

  The DEM is referenced vertically to the North American Vertical Datum of 1988 (NAVD88) with vertical units of meters and horizontally to the North American Datum of 1983 (NAD83). The resolution of the DEM is approximately 3 meters.