{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T17:50:15Z","timestamp":1772301015796,"version":"3.50.1"},"reference-count":12,"publisher":"MDPI AG","issue":"23","license":[{"start":{"date-parts":[[2021,11,29]],"date-time":"2021-11-29T00:00:00Z","timestamp":1638144000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"German Federal Ministry of Transport and Digital Infrastructure","award":["19F1038"],"award-info":[{"award-number":["19F1038"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>As a first step towards a new combined product for sea ice classification based on optical\/thermal data collected by Sentinel-3 satellites and SAR data from Sentinel-1 satellites, which can be used as an appropriate support for navigation in Arctic and sub-Arctic waters, two existing classification algorithms are adapted to these data. The classification based on optical data has improved, so it is expected that the results will be ideally suited to be processed together with SAR data into significantly improved sea ice information products to support marine navigation. The usefulness of the combined processing is demonstrated by means of two simple algorithms and a more sophisticated approach is outlined, which will be realized in the future in order to form the basis for an integration into an operational service with the involvement of further partners and users.<\/jats:p>","DOI":"10.3390\/rs13234842","type":"journal-article","created":{"date-parts":[[2021,12,1]],"date-time":"2021-12-01T01:45:02Z","timestamp":1638323102000},"page":"4842","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Combined Use of Space Borne Optical and SAR Data to Improve Knowledge about Sea Ice for Shipping"],"prefix":"10.3390","volume":"13","author":[{"given":"Christine","family":"K\u00f6nig","sequence":"first","affiliation":[{"name":"Dr. Thomas K\u00f6nig & Partner, Fernerkundung GbR, D-82234 Die\u00dfen, Germany"}]},{"given":"Thomas","family":"K\u00f6nig","sequence":"additional","affiliation":[{"name":"Dr. Thomas K\u00f6nig & Partner, Fernerkundung GbR, D-82234 Die\u00dfen, Germany"}]},{"given":"Suman","family":"Singha","sequence":"additional","affiliation":[{"name":"German Aerospace Center (DLR), Maritime Safety and Security Lab, Remote Sensing Technology Institute, D-28359 Bremen, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9748-1589","authenticated-orcid":false,"given":"Anja","family":"Frost","sequence":"additional","affiliation":[{"name":"German Aerospace Center (DLR), Maritime Safety and Security Lab, Remote Sensing Technology Institute, D-28359 Bremen, Germany"}]},{"given":"Sven","family":"Jacobsen","sequence":"additional","affiliation":[{"name":"German Aerospace Center (DLR), Maritime Safety and Security Lab, Remote Sensing Technology Institute, D-28359 Bremen, Germany"}]}],"member":"1968","published-online":{"date-parts":[[2021,11,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"425","DOI":"10.3189\/S0022143000015276","article-title":"Applications of Satellite Thermal Infrared Images for Monitoring North Water during the Periods of Polar Darkness","volume":"25","author":"Dey","year":"1980","journal-title":"J. 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