Interim Collection Comparison Report for Big Earth Data Initiative
Metadata Source: CMR Metadata Collections
Metadata Dialect: ISO 19115-2
Evaluation Target: UMM-Collection metadata profile
The Unified Metadata Model Collection (UMM-Collection) profile describes documentation concepts that are considered important for collection level metadata. The profile is includes three documentation levels (Required, Recommended and Optional).
Metadata Collection
| Section |
|---|
| Column |
|---|
| - Alaska Satellite Facility (ASF)
- Crustal Dynamics Data Information System (CDDIS)
- Global Hydrology Resource Center (GHRC)
- Goddard Earth Sciences Data and Information Center (GES_DISC)
- Level 1 and Atmosphere Archive and Distribution System (LAADS)
- Land, Atmosphere Near real-time Capability for EOS (LANCEMODIS)
- Land, Atmosphere Near real-time Capability for EOS (LANCEAMSR2)
- Langley Research Center (LARC)
- Langley Research Center (LARC_ASDC) Atmospheric Science Data Center
- Land Process DAAC - EOS Core System (LPDAAC_ECS)
- National Snow and Ice Data Center Version 0 (NSIDCV0)
- National Snow and Ice Data Center EOS Core System (NSIDC_ECS)
- Ocean Biology Processing Group (OBPG)
|
| Column |
|---|
| - Oak Ridge National Laboratory (ORNL)
- Physical Oceanography DAAC (PODAAC)
- Socioeconomic Data and Applications Center (SEDAC)
- U.S. Geological Survey Earth Resources Observation Systems (USGS_EROS)
- (AU_AADC)
- ESA
- EUMETSAT
- ISRO
- JAXA
- LM_FIRMS
- NOAA_NCEI
- USGS_LTA
|
|
Analysis
We examined 4180 over 15,000 metadata records from 17 26 collections extracted from the Common Metadata Repository (CMR) during October 2015April 2016. The table below provides links below connect to tables in google sheets which provide the average number of occurrences of Required UMM-Common 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.
Overall CMR metadata collections are doing a very good job of documenting Required UMM-Common Collection concepts. The pink shaded cells near the bottom of the table indicate required elements that are missing for some of the collectioncollections.
Table 1: Collection Comparison of UMM-Common Required Elements
| Element Name | Path Elements | ASF | CDDIS | GES_DISC | GHRC | GSFCS4PA | LAADS | LANCEAMSR2 | LANCEMODIS | LARC | LARC_ASDC | LPDAAC_ECS | NSIDC_ECS | OB_DAAC | OMINRT | ORNL_DAAC | PODAAC | USGS_EROS | Count |
| Metadata Modified Date | gmd:dateStamp/gco:DateTime | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 17 |
| Resource Title | gmd:identificationInfo/gmd:citation/gmd:title | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 17 |
| Abstract | gmd:identificationInfo/gmd:abstract | 1.00 | 1.00 | 1.00 | 1.00 | .96 | .68 | 1.00 | .94 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | .50 | 1.00 | .99 | 1.00 | 17 |
| Keyword Type Code | gmd:identificationInfo/gmd:descriptiveKeywords/gmd:type/gmd:MD_KeywordTypeCode | 4.50 | 3.68 | 6.00 | 6.97 | 5.54 | 5.00 | 7.00 | 4.72 | 4.46 | 4.00 | 4.00 | 4.67 | 5.00 | 3.00 | 4.97 | 5.00 | 4.00 | 17 |
| Temporal Extent Begin | gmd:identificationInfo/gmd:extent/gmd:temporalElement/gmd:extent/gml:TimePeriod/gml:beginPosition | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | .99 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 17 |
| Instrument Short Name | gmi:acquisitionInformation/gmi:instrument/gmi:identifier/gmd:code | 1.00 | 8.64 | 1.11 | 1.93 | .68 | 1.00 | 1.00 | 1.00 | 1.34 | 5.65 | 1.11 | 1.86 | 1.00 | 1.00 | 2.60 | 2.53 | 2.00 | 17 |
| Platform Short Name | gmi:acquisitionInformation/gmi:platform/gmi:identifier/gmd:code | 1.00 | 8.64 | 1.00 | 1.28 | .90 | 1.00 | 1.00 | 1.00 | 1.33 | 3.16 | 1.11 | 1.59 | 1.00 | 1.00 | 1.37 | 2.09 | 2.00 | 17 |
| Science Keyword | gmd:identificationInfo/gmd:descriptiveKeywords/gmd:keyword | 115.43 | 19.25 | 7.03 | 10.12 | 21.04 | 18.60 | 9.80 | 9.35 | 6.36 | 10.81 | 5.21 | 10.32 | 5.00 | 3.00 | 11.62 | 7.79 | 6.82 | 17 |
| Spatial Extent | gmd:identificationInfo/gmd:extent/gmd:geographicElement/gmd:westBoundLongitude/gco:Decimal | 1.00 | .96 | 2.00 | 1.00 | .82 | 2.00 | .80 | 1.66 | 1.50 | .53 | 1.00 | 1.04 | 1.00 | | 1.00 | 1.02 | 1.00 | 16 |
| Spatial Extent | gmd:identificationInfo/gmd:extent/gmd:geographicElement/gmd:eastBoundLongitude/gco:Decimal | 1.00 | .96 | 2.00 | 1.00 | .82 | 2.00 | .80 | 1.66 | 1.50 | .53 | 1.00 | 1.04 | 1.00 | | 1.00 | 1.02 | 1.00 | 16 |
| Spatial Extent | gmd:identificationInfo/gmd:extent/gmd:geographicElement/gmd:southBoundLatitude/gco:Decimal | 1.00 | .96 | 2.00 | 1.00 | .82 | 2.00 | .80 | 1.66 | 1.50 | .53 | 1.00 | 1.04 | 1.00 | | 1.00 | 1.02 | 1.00 | 16 |
| Spatial Extent | gmd:identificationInfo/gmd:extent/gmd:geographicElement/gmd:northBoundLatitude/gco:Decimal | 1.00 | .96 | 2.00 | 1.00 | .82 | 2.00 | .80 | 1.66 | 1.50 | .53 | 1.00 | 1.04 | 1.00 | | 1.00 | 1.02 | 1.00 | 16 |
| Related URL | gmd:distributionInfo/gmd:distributor/gmd:distributorTransferOptions/gmd:onLine/gmd:linkage/gmd:URL | 1.00 | 1.00 | 7.40 | 6.51 | 7.21 | 3.21 | 6.20 | 3.21 | 3.48 | .62 | 7.05 | 2.29 | 5.41 | | 2.16 | 8.01 | .45 | 16 |
| Resource Contact | gmd:identificationInfo/gmd:pointOfContact/gmd:organisationName | 1.00 | 1.00 | | 1.00 | 1.00 | | 1.00 | .34 | .45 | 1.00 | 1.00 | .93 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 15 |
| Resource Contact Role | gmd:identificationInfo/gmd:pointOfContact/gmd:role/gmd:CI_RoleCode | 1.00 | 1.00 | | 1.00 | 1.63 | | 1.00 | .34 | .45 | 1.00 | 1.00 | .93 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 15 |
| Distribution Contact | gmd:distributionInfo/gmd:distributor/gmd:distributorContact/gmd:organisationName | | 1.00 | 1.00 | | | | | .66 | 1.00 | 2.00 | 1.00 | .99 | 1.00 | 1.00 | | 1.00 | 1.00 | 11 |
| Temporal Extent End | gmd:identificationInfo/gmd:extent/gmd:temporalElement/gmd:extent/gml:TimePeriod/gml:endPosition | .43 | | | .94 | .38 | | | | .05 | 1.00 | .12 | .58 | .67 | | 1.00 | .43 | | 10 |
| Processor | gmd:dataQualityInfo/gmd:lineage/gmd:processStep/gmd:processor/gmd:organisationName | 1.00 | | | | .57 | 1.00 | | .69 | .45 | | 1.00 | 1.00 | | | 1.00 | 1.00 | 1.00 | 10 |
| TwoDCoordinateSystem | gmd:identificationInfo/gmd:extent/gmd:geographicElement/gmd:geographicIdentifier/gmd:code | | .96 | | | .09 | | | | .27 | .10 | 1.25 | 1.25 | | | | | 1.00 | 7 |
Collection Required Elements
Browse URL | gmd:identificationInfo/gmd:graphicOverview/gmd:fileName/gmx:FileName/@src | | | | .58 | | | 1.00 | | | | | | | | | .11 | | 3
