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Overview

We examined over 15,000  000 metadata records from 26 collections extracted from the Common Metadata Repository (CMR) during April 2016. The links below connect to tables in google sheets which provide the average number of occurrences of UMM-Collection elements in each of these collections. A value of 1 or more typically (although not necessarily) indicates that the element is included one or more times in each record in a collection.  A value < 1.0 is typically the percentage of records in a collection that include the metadata element. Cells with pink backgrounds indicate values of 0, meaning the element is completely missing from the collection.

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Where are contacts documented in the CMR?

The table below shows how CMR metadata collections document contact information.  The following contact types are considered: Metadata Contact, Point of Contact, Resource Contact, Distributor Contact and Processor.

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• The Metadata Contact organization exists in all CMR metadata collections
  
• The Point Of Contact organization exists in all CMR metadata collections
• Resource Contact information is missing from the majority of CMR metadata collections. 
• Distributor Contact information is included in 72% of NASA metadata collections.
• Processor Contact information is included in 72% of NASA metadata collections.

Where are Identifiers used in CMR metadata?

The table below shows where Identifiers are used in CMR metadata collections. Identifiers enable specific metadata concepts such platforms, instruments, Sensors, etc to be unambiguously identified. 

Table 1: Identifiers in the CMR

Observations

• All CMR metadata collections include a Resource Identifier
• All CMR metadata collections include Instrument and Platform Identifiers.
• Associated resource identifiers (AggregationInfo) are included to some degree in 5 CMR metadata collections