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The NSIDC Web site and data services are currently having intermittent problems and may be unavailable. We are working to restore these services as soon as possible and apologize for any inconvenience this may cause. Please contact NSIDC User Services for assistance.

Use and Copyright

You may download and use any imagery or text from our Web site, unless it is specifically stated that the information has limitations for its use. Please credit the National Snow and Ice Data Center by citing our data.

Citing NSIDC Data

Please cite the use of our data in your work with a formal citation. A citation acknowledges our data contributors, and allows us to track the use and impact of our data. It also helps us report data distribution activity to funding agencies, and to assist others who may contact us about data that are referenced in publications.

How to Cite NSIDC Data

  • Please include a citation in the references section of your publication. While we appreciate acknowledgement in the text of the publication, we are better able to track the use of our data sets if citations are included as references.
  • You can find appropriate citations on the catalog pages and in the guide documentation for all of our data sets. If you need assistance with a citation format, please contact NSIDC User Services.

The following example shows how to cite the use of a data set in a publication. List the principal investigators, year of data set release, data set title and version number, indicate subset used (for example, March to June 2004, or 84°N, 75°W; 44°N, 10°W. This field is for temporal or spatial coverage of the data used. It is necessary to enable a micro-citation or the ability to refer to the specific data used--the exact files, granules, records, etc.), publisher: Boulder, Colorado USA: National Snow and Ice Data Center, and the Digital Object Identifier (DOI) if one is available.

Author's Name. Year of Publication. Title of Data Set and Version Number, [indicate subset used]. Boulder, Colorado USA: National Snow and Ice Data Center. DOI.

Njoku, Eni. 2004, updated daily. AMSR-E/Aqua L2B Surface Soil Moisture, Ancillary Parms, & QC EASE-Grids V002, March to June 2004. Boulder, Colorado USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N5.

Use of Photographs and Photograph Credits

You may download photos on this site free of charge. However, the photos come from a variety of sources, and may have different copyright restrictions and credits. Please read the information accompanying each photo before publishing it. Please provide proper credits for any photo you use:

  • If the image is cited on our Web site as being courtesy of another person or agency, we recommend the following citation: "Image/photo courtesy of [insert agency and/or person name here] and the National Snow and Ice Data Center, University of Colorado, Boulder."
  • If the image does not have specific citation information on our Web site, we recommend the following citation: "Image/photo courtesy of the National Snow and Ice Data Center, University of Colorado, Boulder."

For questions about image use and credits, please see the NSIDC Photo & Image Gallery Help & FAQ Web page.

If you need additional help, please contact NSIDC User Services.