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Ancillary Descriptions (AD) in the GCMD consists
of brief descriptions of:
- Data Centers (AD-Dc) (Example: National
Snow and Ice Data Center).
- Projects or Campaigns (AD-Pj) (Example:
the Tropical Ocean Global
Atmosphere project, TOGA).
- Platforms (AD-Pl) (formerly called Sources;
example: the spacecraft
description for the Terra satellite).
- Instruments (AD-I) (formerly called Sensors;
example: the remote sensing
instrument, AVHRR).
Ancillary Descriptions provide related background
information but do not
directly describe the data sets. However,
they are usually linked to data
sets. For assistance in writing ancillary
information, you may visit the
Ancillary
Description Writer's Guide and use the
tools to create
or modify a description.
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