Page History
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- DAAC records in 2016 to DAAC records in 2017
- DAAC records to SciOps records
- DAAC records to IDN records
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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.
Table 1 - UMM Concept Percent Completeness in NASA Collections
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Temporal Extents: Temporal extents are generally more common than spatial extents in NASA and IDN collections.
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. This Table 2 summarizes the results and provides links to Tables that show the elements that changed:
Table 2. Counts of completeness changes in
NASA DAAC Collections - 2016-2017
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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 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.
Table 1. Metadata Groups in the Common Metadata Repository (CMR)
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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 |
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.
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