Overview

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The CMR includes metadata that originate in three dialects: DIF, ECHO, and ISO. The largest portion of CMR collection records are in the SciOps collection, and are inserted into the CMR in DIF format. The second largest portion of metadata for NASA collections originate from ECHO and are inserted into the CMR in ECHO format. These are referred to here as the NASA collection. A third group of metadata in the CMR originate from other agencies around the world and are generally either in DIF or possibly in ISO. These are referred to as the Other collection. The focus of this evaluation is NASA metadata collections.

The purpose of this evaluation is compare the usage of elements in NASA 2016 metadata collections with NASA 2017 metadata collections during 2016 and 2017 in order to identify describe and visualize how NASA metadata collections are evolving over time.

Data Selection

The table Table 1 below shows the collections included in this evaluation as well as the record count and change in number of records for each collection.

Table 1. Collections and record counts

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This analysis compares element usage in 17 NASA 2016 collection collections with element usage in 18 2017 collections.  This evaluation identifies elements which exist in collections even if they are incomplete.  In order for an elements to exist in a collection it must be present in at least 1 one metadata record included in the collection. Element usage for NASA 2016 collections and NASA 2017 collections is shown below using bubble charts.  The bubble chart interpretation graphic provides a schematic for interpreting the bubble plots. 

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Chart 1 below compares element existence in 2016 NASA Collections with 2017 NASA collections.  The X axis shows the percent of NASA 2016 collections that include an element. The Y axis shows the percent NASA 2017 collections that include an element.  The bubble size shows the number of elements included in the 2 collectionsat each location on the chart.

The large red bubble in the upper left corner of the plot shows elements that exist is 100 percent 100% of NASA 2017 collections and 0 percent 0% of NASA 2016 collections.  This bubble includes 24 elements, as shown in the legend.  The large yellow bubble in the upper right corner of the plot shows elements that exist is 100 percent 100% of NASA 2016 and 100 percent 100% of NASA 2017 collections.  This bubble includes 22 elements, as shown in the legend. The data for Chart 1 is accessible in Google Sheets.  To view the data and bubble chart in Google Sheets click on the image. Click the chart or this link to view the data.

Chart 1: NASA 2016 EXIST vs NASA 2017 Exists

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Click on the chart graphic above to view an interactive version of the data for this chart .  The interactive version that enables data identification for each bubble and includes a look up table for identifying the ISO elements associated with the bubble. To access and use the interactive version:

1. Click on the chart graphic above to view the chart in Google Sheetsdata
2. Hover over the bubbles with your mouse to identify the concept existence in 2017 NASA collections and concept existence in 2016 NASA collections associated with the bubble.  The hover identification also shows the number of elements (Counts) associated with each bubble.
3. To the right left of the chart is a lookup table for identifying the xpaths associated with each of the bubbles.  To identify the xpaths associated with a bubble, match the NASA Exists and Other Exists values from the bubble hover with the values in the look up table.

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