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We examined over 15,000 metadata records from 26 collections extracted from the Common Metadata Repository (CMR) during April 2017. 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.

Where are Contacts used 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 and is complete in 22/26 collections
  
• The Point Of Contact organization exists in all CMR metadata collections and is complete is all collections with the exception of OMINRT
• Resource Contact information is missing from the majority of CMR metadata collections and is complete in 0 CMR collections
• Distributor Contact information is included in 20/26 of CMR metadata collections and is complete in 12 CMR collections
• Processor Contact information is included in 10 NASA metadata collections and is complete in 3 NASA 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. 

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• Resource Identifier and File Identifier elements are complete in all CMR metadata collections
• Platform identifier exists in all CMR metadata collections and is complete in 22/26
• Instrument Identifier exists in all CMR metadata collections and is complete in 15/26 collections
• Reference System identifier exists in 25/26 CMR collections and is complete in 15/26 collections
• Operation identifiers exists in 22/26 CMR collections and is complete in 9/26 collections
• Sensor identifiers exists in 14 NASA metadata collections and is complete in 3 NASA collections
• Geographic Identifier exists in 7 NASA metadata collections and is complete in 1 NASA collection
• Aggregate Dataset Name Identifier exists in 9 CMR metadata collections and is complete in 0 CMR collections

Where are Citations used in CMR metadata?

The table below shows where Citations are used in CMR metadata collections.

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• Resource Citation date and title elements are complete in all CMR  collections
  
• Instrument Citation exists in all CMR metadata collection and is complete in 15/26 CMR collections
• Contact Information for the Resource Citation is included in 3/26 CMR metadata collections and is complete in 0 CMR collections

Where are External Links (OnlineResources) used in CMR metadata?

The table below shows where Online Resource elements are used in CMR metadata collections.

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• An Online Resource URL for Distributor Transfer Options exists in all CMR metadata collections with the exception of OMINRT and is complete in 21 CMR collections
• An Online Resource URL for Keyword Thesaurus exists in 15/26 CMR metadata collections and is complete in 8 CMR collections
• An Online Resource URL for the Metadata Contact  and Point Of Contact exists in 17/26 CMR metadata collections and are complete in 2 or less CMR collections
• An Online Resource URL for Associated Resources exists in 7/26 CMR metadata collections and is complete in 0 CMR collections
• An Online Resource URL for Distributor Contact exists in 11/26 CMR metadata collections and is complete in 0 CMR collections
• An Online Resource URL for Processor Contact exists in 2 NASA metadata collections and is complete in 0 CMR collections
• An Online Resource description for Point Of Contact exists in 1 NASA metadata collections and is complete in 0 CMR collections
  
  

Where are Geographic

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Extents used in CMR metadata?

The table below shows where geographic elements are used in CMR metadata collections.

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• • 'HORIZONTALTILENUMBER - Horizontal tile number of a grid, which increases from left to right'
  • 'VERTICALTILENUMBER - Vertical tile number of a grid, which increases from top to bottom'
  • 'TileID - MODIS Land tile identification number which represents a geographical area on the surface of the Earth bounded by latitude and longitude coordinates'
  • 'Universal Transverse Mercator (UTM)ZoneIdentifier'
• 7 NASA collections include a Geographic Identifier code with the most common value 'Universal Transverse Mercator (UTM)'

Where are Temporal

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Extents used in CMR metadata?

The table below shows where temporal elements are used in CMR metadata collections.

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• TimePeriod/beginPosition exists in all CMR collections and is complete in 22 CMR collections
• TimePeriod/end Position exists in 24/28 CMR collections and is complete in 2 CMR collections
• TimePeriod/endPosition exists in 7 CMR collections with an attribute value of indeterminatePosition='Now'.  This element is complete in 2 NASA collections.
• TimeInstant/timePosition exists in 1 CMR collection with an attribute value of framevalue='Eastern-Daylight'.
  
  

Where are

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Dates used in CMR metadata?

The table below shows the usage of  Date elements are used in CMR metadata collections.

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• Metadata Creation/Modified Date (timeStamp element) is complete in all CMR metadata collections
• Resource Citation Date is complete in all CMR collections
• Keyword Thesauraus Name Date exists in 15 NASA collections and is complete in 7 NASA collections
• AggregateDataSetName Date exists in 7 CMR metadata collections

How are Keywords used in CMR metadata?

The table below shows the usage of keyword elements are used in CMR metadata collections.

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• The Keyword element is complete in all CMR metadata collections
  
  

Where are Descriptions used in CMR metadata?

The table below shows the usage of Description elements in CMR metadata collections. The Description field is commonly used

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