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  • On 18 April 2022, the file names for this data set were updated. Please update any scripts you have to use the new file names. See the Data Announcement: IMS Daily Northern Hemisphere Snow and Ice Analysis Files Renamed for full details.

IMS Daily Northern Hemisphere Snow and Ice Analysis at 1 km, 4 km, and 24 km Resolutions, Version 1 (G02156)
Data set:
G02156
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This is the most recent version of these data.
Version Summary
Initial release

Overview

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 km, 4 km, and 24 km. Note: The IMS product is considered an operational product; however, USNIC, who creates this product, does not guarantee availability or timely delivery of data via the NIC Web server. NSIDC, as the data archive, 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 private. Users with real-time operational needs should visit the USNIC Web site and contact the USNIC Liaison to request access to their operational server.
Data Contributor(s):
U.S. National Ice Center.
Parameter(s):
ICE EXTENT SNOW COVER
Platform(s):
AQUA, DMSP, DMSP 5D-3/F17, GOES-10, GOES-11, GOES-13, GOES-9, METEOSAT, MSG, MTSAT-1R, MTSAT-2, NOAA-14, NOAA-15, NOAA-16, NOAA-17, NOAA-18, NOAA-N, RADARSAT-2, SUOMI-NPP, TERRA
Sensor(s):
AMSU-A, ATMS, AVHRR, GOES I-M IMAGER, MODIS, MTSAT 1R Imager, MTSAT 2 Imager, MVIRI, SAR, SEVIRI, SSM/I, SSMIS, VIIRS
Data Format(s):
GIF, NetCDF, GeoTIFF, ASCII
Temporal Coverage:
5 February 1997 to present
Temporal Resolution:
1 day, 1 day
Spatial Resolution:
24 km
24 km
,
1 km
1 km
Spatial Coverage:
N:
90
S:
0
E:
180
W:
-180

Data Access & Tools

Help Articles

Getting started

Yes, one user of IMS has created and made available a suite of Python tools.

How To

There are two "tricks" to using this dataset with GMT: reading the data into a GMT grdfile, and knowing the projection to use when plotting data over the gridded image.
If you need to reproject the IMS 1 km or 4 km GeoTIFFs to geographic latitude/longitude, we recommend using the Geospatial Data Abstraction Library (GDAL). Instructions for downloading and installing it can be found here: