Field Definitions are Available Here
Granule
The date/time that data provider last updated the granule info on data provider's database.
2009-08-19T11:56:11.670Z
/LastUpdate
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:date/gmd:CI_Date/gmd:date/gco:DateTime
Quality Information (ECHO)