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The largest change identified is forty-eight elements that were introduced to the metadata during 2017. These forty-eight elements existed in Some 2017 collections, and did not exist in any (None) 2016 collections.  The second largest change is the deletion of twenty-one elements that existed in some 2016 collections in 2016 and in none during 2017 no 2017 collections (None).  This change was primarily due to an improvement in the translation from the CMR into ISO. 

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The CMR includes three groups of metadata records with separate and distinct histories and processing paths, see Table 1. The first, referred to as the NASA Collection, is made up of metadata records originally created at DAACS using the ECHO dialect. The second, referred to as the IDN Collection, includes records from major International data providers that are ingested into the CMR by SciOps. The third collection, referred to as SciOps, includes metadata records from over more than 1500 sources that originated in the Global Change Master Directory (GCMD) and the DIF dialect. Each of these collections includes sources that are analyzed separately with the expectation that they may have homogeneous characteristics. Of course, the validity of this assumption may vary with collection and source.

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