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Emerging technology gives first ever global view of hidden vessels

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Satellite radar and machine learning publicly reveal previously unseen vessel activity around the world

Washington, D.C., June 08, 2022 (GLOBE NEWSWIRE) -- Global Fishing Watch has developed and publicly released the first ever global map of previously undetected dark fleets, or vessels that do not broadcast their location or appear in public monitoring systems.

Powered by satellite radar imagery and machine learning, the map layer is updated daily within the main Global Fishing Watch map application. The portal is available for free to anyone in the world with an internet connection, helping arm authorities, researchers and the public alike with the power to monitor vessel activity in all coastal waters, identify dark fleet patterns and build the necessary understanding to quantify threats to the ocean. The user-friendly new map layer helps create equitable access to marine-related data in time for World Ocean Day on June 8.

The lack of information pertaining to how and where vessels are fishing has clouded our understanding of the true global footprint of fishing activity. This makes meaningful change difficult. To see these impacts, satellite radar technology, known as synthetic aperture radar (SAR), functions day and night in all types of weather and can generate imagery despite cloud cover or storm systems, resulting in detection capabilities that are significantly advanced over other satellite-mounted sensors. 

“It is surprising how little we have known to date about the true scale of human activity on the water,” said David Kroodsma, director of research and innovation at Global Fishing Watch. “If you combine vessels that intentionally shut off their signal with the significant number of boats that don’t make their whereabouts known in public systems at all, you end up with gaps in data, monitoring and accountability. We are using satellite radar imagery to reduce that information gap and put our findings at the fingertips of those who want to ensure our ocean is managed equitably and sustainably.” 

The new global map layer draws from a massive data-processing pipeline and uses machine learning to crunch petabytes, or millions of gigabytes, of radar imagery taken by the European Space Agency’s Sentinel-1 satellites. By analyzing the entire archive of Sentinel-1 radar imagery, Global Fishing Watch has made 20 million detections of sea-going vessels greater than approximately 10 meters in length—and matched these detections to 100 billion GPS points from vessels broadcasting their position on the automatic identification system. This matching differentiates vessels that broadcast their position from those that remain dark in public monitoring systems, resulting in more comprehensive views of vessel movements across the global ocean. This information can help authorities pinpoint areas with suspicious activity and identify vessel patterns that may indicate illegal activity or previously unquantified fishing pressures. 

Global Fishing Watch used satellite radar and optical imagery to reveal around 900 vessels of Chinese origin fishing illegally in North Korean waters in violation of United Nations sanctions—the largest known case of illegal fishing by an industrial fleet operating in another nation’s waters. Global Fishing Watch has since improved and expanded its use of satellite radar to study previously unseen fishing activity near marine protected areas in the Mediterranean Sea and hotspots of previously hidden activity in coastal waters around Africa. This emerging method of “seeing” vessels is revealing that the ocean is far busier than conventional monitoring systems show. 

“While there are often legitimate reasons for not broadcasting a vessel’s location—not all governments require it—illegal operators will often turn off their signals to conceal their activity,” added Kroodsma. “The use of satellite radar to detect and map previously hidden and potentially illegal or harmful activity has opened a new realm of possibilities for remote sensing and big tech’s battle for the environment.” 

Amplifying the potential of satellite radar technology, Global Fishing Watch partnered with the Defense Innovation Unit in July 2021 to host the xView3 competition. The challenge invited machine learning developers from all over the world to create and submit computer algorithms to help detect dark vessels, drawing 1,900 registrants from 67 countries. Global Fishing Watch is using the winning entries announced earlier this year to refine and advance dark vessel detection methods at global scale, and expects to be able to shed light on many human activities on the ocean in the near future.

“By seeing and characterizing the activity of these expansive dark fleets, we can begin to better understand and quantify not just illegal fishing but a great deal of human activity that is impacting our marine environment,” said Paul Woods, chief innovation officer at Global Fishing Watch. “These are exciting times when it comes to open, accessible data that anyone can use for free to understand and advocate for the fragile marine areas they care about most.”

About satellite radar imagery:Satellite radar is able to overcome limitations of other satellite-based monitoring systems with its ability to see through rain, darkness and cloud cover. Radar can detect at-sea vessels and structures in any weather conditions and its imaging capabilities make it one of the most powerful tools of remote sensing. Satellite radar is an active sensor that shoots microwaves to the earth surface and measures the amplitude and phase of the signals that are reflected back from objects on the ground and water, known as backscatter. The images formed from this backscatter contain rich information about size, orientation, composition, condition and texture of the features on the water. These imaging systems hold an advantage over passive satellite sensors, such as electro-optical imagery, which is similar to taking a picture with a camera and relies on sunlight and/or the infrared radiation emitted by objects on the ground. This latter method can be confounded by cloud cover, haze, weather events, and seasonal darkness at high latitudes. Satellite radar by comparison has proven to be the most consistent option for detecting vessels at sea.

Global Fishing Watch is an international nonprofit organization dedicated to advancing ocean governance through increased transparency of human activity at sea. By creating and publicly sharing map visualizations, data and analysis tools, we aim to enable scientific research and transform the way our ocean is managed. We believe human activity at sea should be public knowledge in order to safeguard the global ocean for the common good of all.

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