Interactive Multisensor Snow and Ice Mapping System Daily Northern Hemisphere Snow and Ice Analysis at 1 kilometer, 4 kilometer, and 24 kilometer Resolutions Version 1, northern hemisphere, 1997-present

This data set provides maps of snow cover and sea ice for the Northern Hemisphere from February 1997 to the present from the United States National Ice Center (USNIC). USNIC analysts produce these using the Interactive Multisensor Snow and Ice Mapping System (IMS). Maps are derived from a variety of data products including satellite imagery and in situ data. The data are provided in ASCII text and GeoTIFF formats in three different resolutions: 1 kilometer (km), 4 km, and 24 km. The purpose of the Interactive Multisensor Snow and Ice Mapping System (IMS) is to provide Satellite Analysis Branch (SAB) analysts with the ability to interactively create, save, and distribute highly accurate maps depicting the extent of daily hemispheric snow and ice coverage. In order to assist the user in making snow/ice determinations, the IMS incorporates a wide variety of satellite imagery (Advanced Very High Resolution Radiometer (AVHRR), Geostationary Operational Environmental Satellites (GOES), Special Sensor Microwave/Imager (SSMI), etc.) as well as derived mapped products (United States Air Force (USAF) Snow/Ice Analysis, advanced microwave sounding unit (AMSU), Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E), National Centers for Environmental Prediction (NCEP) models, etc.) and surface observations. The product is presently used as an operational input into several National Weather Service (NWS) computer weather prediction models as well as several other governmental agencies. U.S. National Ice Center. 2008, updated daily. IMS Daily Northern Hemisphere Snow and Ice Analysis at 1 km, 4 km, and 24 km Resolutions, Version 1. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: https://doi.org/10.7265/N52R3PMC. [2020-11-06].

本数据集提供了1997年2月至今的北半球积雪与海冰分布图，数据由美国国家冰中心（United States National Ice Center, USNIC）发布。美国国家冰中心的分析师依托交互式多传感器冰雪制图系统（Interactive Multisensor Snow and Ice Mapping System, IMS）生成此类地图。地图源自包括卫星影像与原位观测数据在内的多种数据产品。数据集以ASCII文本和GeoTIFF格式提供，涵盖三种分辨率：1千米（km）、4千米及24千米。

交互式多传感器冰雪制图系统（IMS）旨在为卫星分析分部（Satellite Analysis Branch, SAB）的分析师提供交互式创建、保存与分发高精度每日半球积雪与海冰覆盖范围地图的能力。为辅助用户开展积雪/海冰判别工作，IMS整合了多种卫星影像（包括先进甚高分辨率辐射计（Advanced Very High Resolution Radiometer, AVHRR）、地球静止业务环境卫星（Geostationary Operational Environmental Satellites, GOES）、专用传感器微波成像仪（Special Sensor Microwave/Imager, SSMI）等），以及衍生制图产品（美国空军（United States Air Force, USAF）积雪/海冰分析数据、先进微波探测单元（advanced microwave sounding unit, AMSU）、地球观测系统先进微波扫描辐射计（Advanced Microwave Scanning Radiometer - Earth Observing System, AMSR-E）、美国国家环境预报中心（National Centers for Environmental Prediction, NCEP）模式数据等）与地面观测数据。

该产品目前已作为业务输入数据应用于多个美国国家气象局（National Weather Service, NWS）计算机数值天气预报模型，同时也被多家其他政府机构使用。

美国国家冰中心. 2008年，每日更新. 分辨率为1千米、4千米及24千米的IMS每日北半球积雪与海冰分析数据（版本1）. 美国科罗拉多州博尔德市. 国家积雪与冰数据中心（National Snow and Ice Data Center, NSIDC）. doi: https://doi.org/10.7265/N52R3PMC. [2020-11-06].