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enhance environmental quality
Gulf of Maine Times
Committees and Programs > Gulf of Maine Mapping Initiative > Image Library
High-resolution images for downloading and publication

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
data. The Gulf of Maine Mapping Initiative intends
to produce detailed maps of the undersea landscape, including
seafloor topography, geology, and habitats. Recent technological
advances allow seafloor mapping on an unprecedented scale.
Mapping the Gulf of Maine seafloor is one of the essential
first steps for achieving effective management of trawling,
dredging, aquaculture, mining, fiber-optic and electric
power cables, oil
and gas pipelines, wind farms, and other activities that
can affect seabed habitats.
High resolution image 55MB

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
for ocean management. The Gulf of Maine Mapping Initiative is
a multi-year project to secure funding and conduct a comprehensive
mapping program of areas not already covered by high-resolution bathymetric surveys.
The goal is to provide seafloor images, maps, and surveys that
are fundamental for resource management, planning, and many commercial

Interactive map (HTML)
Small version for Web, email, and PowerPoint: 72 dpi, 10×10 inches (JPEG, 496 KB)
for printing:
300 dpi, 10×10 inches
1 MB)
Large version for printing: 300 dpi, 25×25 inches (JPEG, 3.9 MB)

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
cable at Stellwagen Bank in Massachusetts Bay

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

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