Geographic distribution and extent of the unmapped areas within U.S. ocean, coastal, and Great Lakes waters.
Analysis conducted in January 2020.
OAA released the first annual report on the progress made in mapping U.S. ocean, coastal, and Great Lakes waters.
The depth, shape, and composition of the seafloor are foundational data elements that we need to understand in order to explore, sustainably develop, conserve, and manage our coastal and offshore ocean resources.
The 2019 Presidential Memorandum on Ocean Mapping of the United States Exclusive Economic Zone and the Shoreline and Nearshore of Alaska and the global Seabed 2030 initiative make comprehensive ocean mapping a priority for the coming decade.
The Unmapped U.S. Waters report tracks progress toward these important goals.
“The progress made in mapping U.S. waters through 2019 represents the cumulative work of federal and state agencies, nongovernmental organizations, private contracting partners, and crowdsourced contributions,” said Rear Adm. Shep Smith, director of NOAA’s Office of Coast Survey. “Partnerships and advances in technology are key to making significant progress toward our common goal of completely mapping U.S. waters.”
Pulling from an analysis of publicly available bathymetry, the report presents the percentage of unmapped U.S. waters by region and shows our progress towards filling these basic bathymetry data gaps with each passing year.
At the end of 2019, the latest analysis yielded the following results:
Percent of U.S. waters that remain unmapped in 2019:
- U.S. total – 54% of 3,592,000 square nautical miles (snm)
- Atlantic and Gulf of Mexico – 43% of 472,200 snm
- Great Lakes – 95% of 46,600 snm
- Caribbean – 42% of 61,600 snm
- Alaska – 72% of 1,080,200 snm
- Pacific (California, Oregon, Washington) – 24% of 239,700 snm
- Pacific Remote Islands and Hawaii – 50% of 1,691,700 snm
In support of the integrated ocean and coastal mapping goal to “map once, use many times,” all of the data collected in this effort are publicly available to benefit numerous user communities.
For the latest status on these efforts and how you can contribute, visit :