Map: Human Activity Archives - Global Fishing Watch Publicly sharing knowledge about human activity at sea Wed, 12 Nov 2025 18:45:29 +0000 en-US hourly 1 https://wordpress.org/?v=6.8.3 https://globalfishingwatch.org/wp-content/uploads/cropped-gfwisologo512x512-1-1-32x32.png Map: Human Activity Archives - Global Fishing Watch 32 32 How do I view different types of fishing vessel data? (AIS, VMS, VIIRS, SAR) https://globalfishingwatch.org/faqs/how-do-i-view-different-types-of-data-ais-vms-viirs/ Wed, 17 Apr 2019 11:35:24 +0000 http://globalfishingwatch.local/?post_type=ht_kb&p=7383 To view different types of fishing vessel data, on the top of the left sidebar, we have the Activity section.  The ‘apparent fishing effort’ includes AIS and VMS data.  AIS data can be filtered by flag and gear type. VMS data can be filtered by source, flag and, in some cases, by gear type, fleet […]

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]]> How can I interpret night light detections (VIIRS) data in the map? https://globalfishingwatch.org/faqs/how-can-i-interpret-night-light-detections-viirs-data/ Fri, 10 May 2019 10:43:50 +0000 http://globalfishingwatch.stage.pixeledeggs.com/?post_type=ht_kb&p=7524 The VIIRS satellite sensor can identify bright lights at night. This is the same sensor that is used to make the maps of lights at night of the world that you may have seen. In the dark ocean, vessels using bright lights stand out to this sensor and can be tracked. Some forms of fishing, […]

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]]> What is a vessel encounter? https://globalfishingwatch.org/faqs/what-is-a-vessel-encounter/ Thu, 15 Jul 2021 16:30:20 +0000 https://globalfishingwatch.org/?post_type=ht_kb&p=22189 Overview Encounter events identify instances where two vessels appear to meet at sea. Global Fishing Watch classifies an event as an encounter when two vessels are detected: Within 500 meters of one another For a duration of at least 2 hours Traveling at a median speed of less than 2 knots And located at least […]

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]]> How do I upload my own polygon, region or points reference layer? https://globalfishingwatch.org/faqs/upload-polygon-region-or-reference-layer/ Thu, 15 Jul 2021 16:30:01 +0000 https://globalfishingwatch.org/?post_type=ht_kb&p=22195 On the left panel, in the ‘Reference Layers’ section, you can find a ‘+’ icon that allows you to upload your own reference layer. You can then select whether you’d like to add polygon or points data. For polygons, the supported format files are: ShapeFile .zip file containing at least:  .shp: shape format; the geometries […]

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