Page History

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Temporal Extents: Temporal extents are generally more common than spatial extents in NASA and IDN collections.

NASA Metadata Evolution 

This report updates the metadata evaluation that we did during 2016 and provides an opportunity to identify how the CMR metadata have evolved over the year. The total number of records increased by over 50% during this time. We introduced a new visualization to summarize this comparison. This Table summarizes the results and provides links to Tables that show the elements that changed:

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The largest change identified is forty-eight elements that were introduced to the metadata during 2017. The deletion of twenty-one elements that existed in some collections in 2016 and in none during 2017 was primarily due to an improvement in the translation from the CMR into ISO. 

CMR Groups

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CMR Metadata Groups 

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 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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Table 1. Metadata Groups in the Common Metadata Repository (CMR)

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