Last active index for S1 (French, GEOJSON)

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Publisher-reported update

2026-09-09

Ice maps produced for the prevention of flooding by ice jams and the monitoring of river ice during spring floods, winter temperatures or even during problems with ice jams. The maps are derived from radar satellite images, therefore available regardless of cloud cover, from several different sources, using algorithms to classify pixels into types of ice cover. Data is only processed and displayed on the main rivers at risk. The date the image was taken and the approximate region covered by the data is shown in the layer name. Data is added several times a week, but the frequency of revisits to each river can vary between 2 days and 2 weeks. The satellites and algorithms used according to the periods are summarized in this list: Image prefix: period covered; source satellite; resolution of maps produced; algorithm used R2: 2018 - 2022; Radarsat 2; 7m; ICEMAP-r RCM: 2024 - now; Radarsat Constellation Mission; 5m; ICEMAP-r version 2024 S1: 2018 - now; Sentinel 1; 12.5m; Arctus proprietary algorithm The different classes in the legend make it possible to differentiate the following types of ice: __Water (dark blue) __: open water __Water/Smooth Ice (blue) __: combination of water on…

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