IMS Daily Northern Hemisphere Snow and Ice Analysis at 4 km and 24 km ResolutionEntry ID: G02156
Abstract: The National Environmental Satellite, Data, and Information Service (NESDIS), part of the National Oceanic and Atmospheric Administration (NOAA), has an extensive history of monitoring snow and ice coverage. Accurate monitoring of global snow and ice cover is a key component in the study of climate and global change as well as daily weather forecasting. By inspecting environmental satellite ... imagery, analysts from the Satellite Analysis Branch (SAB) at the Office of Satellite Data Processing and Distribution (OSDPD), Satellite Services Division (SSD), created a Northern Hemisphere snow and ice map from November 1966 until the National Ice Center (NIC) took over production in 2008. Initially, the product was produced with a nominal spatial resolution of 190 km and a temporal resolution of seven days. In 1997, the Interactive Multisensor Snow and Ice Mapping System (IMS) became operational, giving the satellite analysts improved access to imagery and drawing tools. Since the inception of IMS, the charts have been produced daily at a nominal resolution of 24 km (1024 x 1024 grid). Beginning in February 2004, further improvements in computer speed and imagery resolution allowed for the production of a higher resolution daily product with a nominal resolution of 4 km (6144 x 6144 grid). NSIDC archives and distributes the 24-km and the 4-km IMS product in ASCII text format from February 1997 to present and February 2004 to present, respectively. NSIDC also distributes browse images in GIF format and latitude and longitude grids for these products. In June 2006, NSIDC started distributing 4-km GeoTIFF files for use with GIS applications. Note: The IMS product is considered operational, but NIC does not guarantee availability or timely delivery of data via the NIC Web server, and NSIDC does not guarantee availability of this product via the NSIDC Web server. These servers should not be used to support operational observation, forecasting, emergency, or disaster mitigation operations, either public or p
rivate. Users with real-time operational needs should visit the (http://www.natice.noaa.gov/) NIC Web site and contact the National Ice Center Liaison to request access to the operational server.
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: NOAA/NESDIS/OSDPD/SSD
Dataset Title: IMS Daily Northern Hemisphere Snow and Ice Analysis at 4 km and 24 km Resolution
Dataset Release Date: 2004-12-01
Dataset Release Place: Boulder, CO
Dataset Publisher: National Snow and Ice Data Center (NSIDC)
Data Presentation Form: imageOnline Resource: http://nsidc.org/data/g02156.html
Start Date: 1997-02-01
Temporal Resolution: Daily
Quality The quality of the snow and ice cover charts will depend on the availability of clear sky imagery, the georegistration of that imagery, the quality of other input data sources, and the experience of the analyst. Regions covered by cloud during the 24-hour analysis period are generally mapped as persistence, taking lower resolution passive microwave data and surface observations into account where possible. Sub-grid scale features may not be detected.
Data Set Progress
Distribution Media: FTP
Distribution Size: 36913 KB
Distribution Format: GeoTIFF
Distribution Media: ftp
Distribution Size: 20 KB - 60 KB
Distribution Format: ASCII
Email: SSDWebmaster at noaa.gov
U.S. Department of Commerce National Oceanographic and Atmospheric Administration 14th Street & Constitution Ave., NW Room 6217
Province or State: DC
Postal Code: 20230
Role: TECHNICAL CONTACT
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
National Snow and Ice Data Center CIRES, 449 UCB University of Colorado
Province or State: CO
Postal Code: 80309-0449
Armstrong, R.L. and M.J. Brodzik. 2002. Northern Hemisphere EASE-Grid Weekly Snow Cover and Sea Ice Extent Version 2. Boulder, CO, USA: National Snow and Ice Data Center. CD-ROM.
National Operational Hydrologic Remote Sensing Center. 2004. SNODAS Data Products at NSIDC. Boulder, CO: National Snow and Ice Data Center. Digital media.
Ramsey, B. H., 1995. An Overview of NOAA/NESDISs ... Interactive Multisensor Snow and Ice Mapping System. Proceedings of 1995 First Moderate Resolution Imaging Spectrometer (MODIS) Workshop, Greenbelt, MD, National Aeronautics and Space Administration Conference Publication 3318: 23-27.
Ramsey, B. H., 1998. The Interactive Multisensor Snow and Ice Mapping System. Hydrological Processes. Vol. 12: 1537-1546.
Robinson, D.A. 2000. Weekly Northern Hemisphere snow maps: 1966-1999. 12th Conference on Applied Climatology, Asheville, NC, American Meteorological Society. 12-15.
Robinson, D.A. and A. Frei. 2000. Seasonal variability of northern hemisphere snow extent using visible satellite data. Professional Geographer 51: 307-314.
Robinson, D.A., J.D. Tarpley and B. Ramsay. 1999. Transition from NOAA weekly to daily hemispheric snow charts. Proceedings of the 10th Symposium on Global Change, Dallas, TX, American Meteorological Society. 487-490.
Creation and Review Dates
DIF Creation Date: 2004-10-29
Last DIF Revision Date: 2012-05-13