These images are provided for use by newspapers, magazines, Web sites, and newsletters
publishing information about seafloor mapping in the Gulf
of Maine. The images are not copyrighted and may be used
freely, but they must be properly credited as indicated below.
Click on images to see and download high-resolution versions.
Click here for the GOMMI home page.
Map of the Gulf of Maine region
This map shows some major features of the Gulf of Maine region based on existing
Credit: Base map courtesy of United States Geological Survey/Geological Survey of Canada/Woods Hole Field
Areas mapped using high-resolution bathymetric surveys as of June 2007
Only parts of the Gulf of Maine have been mapped in sufficient detail
Interactive map (HTML)
Map with list of survey areas and data providers (Word, 762 MB)
Credit: Gulf of Maine Mapping Initiative
Examples of anticipated GOMMI map products
Seafloor topography and backscatter maps are
derived from acoustic (multibeam sonar) surveys. Geology
and habitat maps are produced by analyzing data from acoustic
surveys and groundtruthing.
Credit: Geological Survey of Canada (Atlantic)
Multibeam sonar image of the seafloor
This image shows the contours of the seafloor at Stellwagen Bank in Massachusetts
Bay based on data from multibeam sonar. The colors indicate
hardness and roughness of
the substrate. Red
and orange indicate coarse sand or rock. Green denotes
sand or muddy sand. Blue means mud or sandy mud. Data from
multibeam surveys can be combined with data from biological
sampling to produce habitat maps.
Credit: United States Geological Survey
Minimizing ecological and financial costs of routing a fiber-optic
Between 1994 and 1996, the National Marine Sanctuary Program worked with the
U.S. Geological Survey to map Stellwagen Bank National Marine Sanctuary
and portions of western Massachusetts Bay. Scientists collected
multibeam sonar data on bathymetry and substrate, which they ground-truthed
with video, photography, and sediment samples. The maps cover 3,900
square kilometers and provide important information for management
and research activities. When a private company needed to place
a fiber-optic cable through the Sanctuary in 2000, they used the
maps to route it across areas of soft sediment, avoiding hard gravel
bottom where the cable could not be buried for its protection. Normally,
extensive bottom sampling would have been required, increasing both
project costs and ecological impacts on seafloor habitats.
Credit: Stellwagen Bank National Marine Sanctuary