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Keyword (Ancillary Keyword)


The <Keyword> field allows authors to provide any words or phrases needed to further describe the data set.


<Keyword>text up to 160 characters</Keyword>

  • The <Keyword> field may contain up to 160 characters from the UTF-8 character set.
  • The <Keyword> field is recommended and may be repeated.
  • Ancillary keywords that are not found in the controlled keyword lists may be provided.


<Keyword>Aerosol Optical Depth</Keyword>
<Keyword>Ceiling Height</Keyword>
<Keyword>Diffuse Radiation</Keyword>
<Keyword>Extraterrestrial Radiation</Keyword>
<Keyword>Global Radiation</Keyword>
<Keyword>Sargasso Sea</Keyword>


This document should be cited as:
Directory Interchange Format (DIF) Writer's Guide, 2016.
Global Change Master Directory.
National Aeronautics and Space Administration.

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