{"@type": "dcat:Dataset", "accessLevel": "public", "bureauCode": ["026:00"], "contactPoint": {"@type": "vcard:Contact", "fn": "Earthdata Forum", "hasEmail": "mailto:earthdata-support@nasa.gov"}, "description": "These charts show ice extent and concentration three times weekly during the ice season, for all lakes except Ontario, from the 1973/74 ice season through the 2001/2002 ice season. Most charts are annotated to indicate data sources. The Straits of Mackinac, Green Bay, and Sault Ste. Marie are enlarged as insets; and in some cases, provided as separate charts. From 1973/74 through 1986/87, charts were prepared by the National Weather Service Forecast Office in Ann Arbor, Michigan. Beginning with the 1987/88 season, the National Ice Center (formerly known as the Navy/NOAA Joint Ice Center) in Suitland, Maryland prepared the charts. Charts are available as GIF files.", "distribution": [{"@type": "dcat:Distribution", "conformsTo": "http://www.isotc211.org/2005/gmi", "description": "The metadata's original source.", "downloadURL": "https://cmr.earthdata.nasa.gov/search/concepts/C1386246219-NSIDCV0.iso19115", "format": "ISO", "mediaType": "text/xml", "title": "Original Metadata"}, {"@type": "dcat:Distribution", "downloadURL": "https://doi.org/10.7265/N5H41PBV", "format": "HTML", "mediaType": "text/html"}, {"@type": "dcat:Distribution", "downloadURL": "https://dx.doi.org/10.7265/N5H41PBV", "format": "HTML", "mediaType": "text/html"}, {"@type": "dcat:Distribution", "downloadURL": "https://noaadata.apps.nsidc.org/NOAA/G00486/", "format": "BIN", "mediaType": "application/octet-stream"}], "identifier": "10.7265/N5H41PBV", "keyword": ["earth-science-snow-ice-cryosphere-ice-extent", "earth-science-snow-ice-cryosphere-lake-ice", "earth-science-snow-ice-cryosphere-river-ice"], "license": "https://www.usa.gov/government-works", "modified": "2026-06-08", "programCode": ["026:000"], "publisher": {"@type": "org:Organization", "name": "NSIDC"}, "spatial": "[\"CARTESIAN\", [{\"WestBoundingCoordinate\": -93.0, \"NorthBoundingCoordinate\": 49.0, \"EastBoundingCoordinate\": -79.0, \"SouthBoundingCoordinate\": 41.0}]]", "temporal": "1973-12-01/2002-05-09", "theme": ["Earth Science"], "title": "Great Lakes Ice Charts, Version 1"}