Own work using: the following Public Domain datasets (grids):

• Great Lakes Bathymetry from National Geophysical Data Center http://www.ngdc.noaa.gov/mgg/greatlakes/greatlakes.html. Credits:
  • National Geophysical Data Center, 1999. Bathymetry of Lake Superior. National Geophysical Data Center, NOAA. [access date: 2015-03-23].
    (the general reference to NGDC because this lake was never published, compilation of Great Lakes Bathymetry at NGDC has been suspended).
  • National Geophysical Data Center, 1999. Bathymetry of Lake Huron. National Geophysical Data Center, NOAA. doi:10.7289/V5G15XS5 [access date: 2015-03-23].
    (only small portion of this map)
• GLOBE http://www.ngdc.noaa.gov/mgg/topo/gltiles.html - land part of this map. Credits:
  National Geophysical Data Center, 1999. Global Land One-kilometer Base Elevation (GLOBE) v.1. Hastings, D. and P.K. Dunbar. National Geophysical Data Center, NOAA. doi:10.7289/V52R3PMS [access date: 2015-03-16].

The coordinates of deepest point are taken from the NOAA Great Lakes Environmental Research Laboratory webpage (www.glerl.noaa.gov/, kml file Google Earth Great Lakes Tour).
The contours are generated by the GMT program, not downloaded from the NGDC website because they are not available for Lake Superior.
The color palette of the depth scale was made to be more or less similar to the color palettes used on the NGDC maps of other Great Lakes.

 

ไฟล์กราฟิกส์นี้ สร้างขึ้นโดยใช้ GMT