Page History
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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.
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The SciOps group includes over 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 over more than 1700 of them each have less 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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