Field Definitions are Available Here
Collection
string (80)
The unique identifier of an instrument.
AMSR-E
/Platforms/Platform/Instruments/Instrument/ShortName
/gmi:MI_Metadata/gmi:acquisitionInformation/gmi:MI_AcquisitionInformation/gmi:instrument/gmi:MI_Instrument/gmi:identifier/gmd:MD_Identifier/gmd:code/gco:CharacterString
Platforms and Instrument Information (ECHO)