Iceberg picture from helicopter11/22/2023 ![]() The area covered by the image analysis coincides with an area related to the satellite path. Upon request of specific clients, Synthetic Aperture Radar imagery will be analysed in more detail than for the daily ice charts and these image analysis usually available to the public. The Canadian Ice Service acquires Synthetic Aperture Radar Satellite imagery in order to have data available for the provision of ice information. Since the fall of 2011, the Arctic charts have been issued weekly year-round. Beginning in March 2006, for the International Polar Year, that frequency was increased to twice a month. Originally the Arctic Regional charts were issued monthly over winter. The frequency of the charts has increased over time. These charts are also valuable to researchers studying ice conditions over time. The analysis of ice conditions provided by these charts is useful for the strategic planning of marine operations by shipping companies and other marine interests. Ice information is presented in the Egg Code format and colour-coded using the World Meteorological Organization Standard. They also list the mean and normal temperatures of some of the region's stations, which give an indication of one of the factors contributing to current ice conditions. ![]() The charts indicate the concentration in tenths, stage of development and form of ice. Satellite imagery is collected over a few days in order to have complete coverage of the area. They are based on an analysis and integration of data from: satellite imagery, weather and oceanographic information, visual observations from ship and aircraft. Regional ice charts show the analysis of ice conditions for a given region valid on Mondays. ![]() Charts for areas outside of Canada are only produced for specific clients. In those areas, 5 days’ notice may be required in order to initiate a chart for an area. Mariners in the Arctic or Hudson Bay are requested to ensure that NORDREG is aware of their location and their plans so that ice information charts will be available. Charts for Northern Canadian Waters are prepared for areas with known marine activity. In the south, charts are available once ice forms. The boundary lines for different ice conditions, of particular importance to navigation, are determined by standards. The charts describe ice concentration in tenths, ice types or stage of development and the form of ice. Daily Ice charts represent the best estimate of ice conditions at the valid time of the chart, based on an integration of data from a variety of sources, such as satellite, and ship and aircraft-based visual observations. ![]()
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