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About David Kroodsma

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So far David Kroodsma has created 19 blog entries.

Transshipment Data and Report

Today we published our initial research on transshipment at sea. Transshipment at sea is where a fishing vessel offloads its catch to a refrigerated cargo vessel (or “reefer”) far from port. You can download a copy of our report via this link. The image above was created by our data scientist Nate Miller, who has [...]

By | 2019-04-12T17:28:41+00:00 February 22nd, 2017|Data blog|

Updated Fishing Lists – Version 0.2

For the first release of Global Fishing Watch, we included only vessels that had more than 1000 positions in a given year, and broadcast their identity as fishing vessels 100 percent of the time in their AIS identity messages. The list of these mmsi can be seen here. However, many vessels have fewer than 1000 position [...]

By | 2018-06-22T19:09:26+00:00 December 22nd, 2016|Data blog|

Web Visualization at Scale

Background One of the main outputs of the Global Fishing Watch project is the interactive map of global fishing. This map presented some particular challenges to implement. This blog post is about these challenges and our solutions to them. Vessel tracks are derived from time series data, that is, ordered points, each of which each have [...]

By | 2018-06-22T19:11:03+00:00 December 21st, 2016|Data blog|

Example of AIS Data for One Vessel Nov 1, 2016

The sample vessel track below shows position broadcasts of the Jin Sheng No.2, a Chinese fishing vessel with mmsi number 413270430. Over three weeks in March of 2015, this vessel steamed from the central Pacific to the coast of Japan, Korea, and China. While moving, a vessel broadcasts its position via AIS every 2 [...]

By | 2019-04-12T11:48:41+00:00 November 1st, 2016|Data blog|
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