This project demonstrates a method for creating satellite-derived bathymetry (SDB) through fusion of Landsat 8 Operational Land Imager (OLI)
and ICESat-2 Advanced Topographic Laser Altimeter System (ATLAS) data. NASA's ICESat-2, which carries a single-photon, green-wavelength (532 nm) lidar,
serves as the reference data from which bathymetric digital elevation models (DEMs) can be produced using a ratio between logarithms of
blue and green OLI bands. Previous work by the Oregon State University team that inspired this project is described in detail in recent publications
in Remote Sensing and
Photogrammetric Engineering and Remote Sensing.
This webGIS was developed with support from NASA ROSES Grant #80NSSC20K0964, as well as Grant #G14AP00002 from the Department of the Interior, United States Geological Survey (USGS) to AmericaView.
All data are in UTM, with a vertical datum of EGM2008, and units in meters
Lingering clouds, shadows, and other obstructions in the input imagery need to be clipped out since bathymetric depths can only be obtained from areas where seafloor is visible. This includes includes areas that are considered "optically deep" (i.e. where the seafloor is not longer visible through the water column). While effort is made to find the best, most cloud-free imagery to run our process on, this is not always the case. Therefore, the problematic areas described have been clipped out from the final DEMs.
Continuing with the topic topic above, sometimes it is too difficult/time consuming to clip out ALL areas where bathymetric depth retrieval failed. This includes piers, docks, boats, small clouds, and other features that otherwise obstruct visibility of the seafloor.
The team involved in the production and dissemation of the data on this website do not claim responsibility for improper use of said data. These bathymetric models are intented for research and should not be used for activities that could put body or vessel in harm's way. As mentioned above, these data do not meet International Hydrographic Organization (IHO) hydrographic survey standards, and as such should not be used for nautical navigation.
Bathymetric DEMs and website created by:
Ben Babbel (firstname.lastname@example.org)
Special thanks to Richie Slocum and Chris Parrish