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The focus of this Case Study is to identify and compare the usage of metadata elements and attributes in CMR metadata collections as well to identify and compare the completeness of UMM-Profile concepts in CMR metadata collections. The field usage studies include a comparison of NASA metadata with Other metadata and SciOps metadata as well as an evaluation of Commonly Used Documentation Objects (CUDOs).

 

This work updates our analysis of CMR metadata in several important ways:

1)     We retrieved new metadata records for all collections in the CMR during March 2017. This increased the size of our sample from ~4000 records from the NASA DAACs to over 32,000 records from the DAACs, SciOps, and the International Directory Network (IDN).

2)     We added a new metric to our calculations that reports the % of records in a metadata group (e.g. DAAC) that include a concept or item. This provides important information for the collection managers as well as providing information on the usage of various metadata elements. For example, we can distinguish items that occur once in every record from those that occur multiple times in some records.

3)     We developed new visualizations for comparing metadata collections and used these visualizations to compare:

  1. DAAC records in 2016 to DAAC records in 2017
  2. DAAC records to SciOps records
  3. DAAC records to IDN records 

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. We examined usage of these Commonly Used Documentation Objects (CUDOs) across NASA and IDN Collections.

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