Bathymetry of Lake Michigan
The online sample offered in the link above demonstrates the interface that accompanies the Bathymetry of Lake Michigan CD-ROM. Links to page size and expanded .GIF images of bathymetry are live in the online demonstration, and images are available for download. Higher resolution .EPS and .JPEG versions of the images are only available on the CD-ROM due to their large size. Links to raster and vector data file are also not active in the online demonstration. For a full description of the Bathymetry of Lake Michigan CD-ROM and accompanying full-size poster, please follow the Data Announcement link above."
Bathymetry of Lake Michigan has been compiled as a component of a NOAA project to rescue Great Lakes lake floor geological and geophysical data and make it more accessible to the public. The project is a cooperative effort between investigators at the NOAA National Geophysical Data Center's Marine Geology and Geophysics Division (NGDC/MGG) and the NOAA Great Lakes Environmental Research Laboratory (GLERL). was compiled utilizing the entire historic sounding database. This bathymetry resolves physiography of the lake floor to an extent that known features are revealed more accurately and features never before seen are revealed for the first time. Bathymetry has been compiled using the entire array of good-quality historical hydrographic soundings collected in support of nautical charting over a 120-year period by the NOAA National Ocean Service and its predecessor agency for Great Lakes surveying, the Army Corps of Engineers. More than 600,000 bathymetric soundings were employed, of which approximately 60 per cent were already in digital form, 25 per cent were digitized in conjunction with this effort, and the remaining 15 per cent were available only on paper survey sheets.
Click on the image above for a larger view of the bathymetry of Lake Michigan.
GEODAS Desktop Software is a user friendly software package which can be used to view, revise, subset and re-format GRD98, ARC ASCII and Binary grids.