Field Definitions are Available Here
Collection
string (2048)
Description of Processing Level.
Data or retrieved environmental variables that have been spatially and/or temporally resampled (i.e., derived from Level 1 or Level 2 data products). Such resampling may include averaging and compositing
/ProcessingLevelDescription
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:processingLevel/gmd:identifier/gmd:MD_Identifier/gmd:description
Descriptive Information (ECHO)