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UMM-Collection Completeness
We examined completeness of the NASA and IDN metadata groups with respect to the UMM-Collection recommendation. Nine of the fifteen required elements are complete in all these metadata collections (see Table 1).
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Commonly Used Documentation Objects
All scientific documentation includes contact information for people and organizations, identifiers, references to external resources (online and offline), spatial and temporal extents, keywords, and other items that occur multiple times. ISO metadata includes standard representations for these objects (and others) and it is helpful to use these standard representations as templates throughout a metadata collection.
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NASA DAAC 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. Table 2 summarizes the results and provides links to Tables that show the elements that changed:
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Group Title | # Records | Group History | Major components - # Records |
NASA | 6367 | Traditional DAAC Metadata – ECHO Dialect | GES-DISC – 1044 ORNL – 1216 18 DAAC Collections |
IDN | 8702 | Non-NASA Collections – Managed by SciOps – Typically, DIF dialect | NOAA_NCEI – 5488 AU_AADC – 2559 8 Miscellaneous Collections Collections |
SciOps (formerly GCMD) | 5465 | Miscellaneous, mostly non-NASA – DIF Dialect | NZ – 857 UCAR – 437 ACADIS – 393 Korea Polar - 329 |
Comparisons between these metadata groups are influenced by the fact that the collections that originate in ECHO contain much more content (406 items) than the collections that originate in DIF (175 items). Much of this content is related to additional attribute information and detailed contact information that exists in ECHO but not DIF.
A clear pattern that emerges from these comparisons is that items tend to exist or be complete in all or none of the collections that originate in DIF (IDN and SciOps). This reflects the homogeneity of content in these collections that may result from management by one group (SciOps) and marked differences between the content of these collections and those that originate in ECHO from various NASA DAACs.
NASA vs. IDN Comparison
The IDN group includes metadata collections from many large international data producers and providers. We had anticipated that these collections might provide insight into metadata practices and priorities of these organizations. In fact, these metadata are collected and shepherded into the CMR by SciOps and it appears that they reflect SciOps metadata management practices more than they reflect the metadata practices of the originating organizations. See NASA vs. IDN for the comparison.
NASA vs. SciOps Comparison
The SciOps group includes more than 13,000 metadata records that originated in the GCMD and were provided by nearly 2000 data providers, all non-IDN members. These providers are diverse and more than 1700 of them each have fewer than ten records in CMR. We selected twenty-five providers with more than 100 records for the comparison of NASA vs. SciOps.
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