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Element Description

The Cloud Cover element provides a measurement, in percentage, of how much of the area of a granule (i.e. an individual data file) is obscured by clouds. Because the definition of a cloud can vary from one data provider to another, this measurement is generally dataset-specific.


Best Practices

The Cloud Cover element is optional. Please be aware this element may vary based on the data provider, due to differing definitions of what is constituted as a cloud. 

Examples:

Cloud Cover: "50"

Cloud Cover: "0"

Cloud Cover: "30.5"


Element Specification

The Cloud Cover element is optional, and may not be repeated (Cardinality: 0..1)

ModelElementTypeConstraintsRequired?Cardinality
UMM-GCloudCoverNumber

0 - 100

No0..1



Metadata Validation and QA/QC

All metadata entering the CMR goes through the below process to ensure metadata quality requirements are met. All records undergo CMR validation before entering the system. The process of QA/QC is slightly different for NASA and non-NASA data providers. Non-NASA providers include interagency and international data providers and are referred to as the International Directory Network (IDN).

Please see the expandable sections below for flowchart details. 


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ARC Priority Matrix

Priority CategorizationJustification

Not Applicable


Not Applicable


This element is categorized as low priority when:

  • The Cloud Cover value provided exceeds 100 or is a negative number
  • The value provided seems inaccurate for the granule

The element is provided and follows all applicable criteria specified in the best practices section above.

ARC Automated Rules

  • TBD

Dialect Mappings

ECHO 10

Cloud Cover is optional in ECHO 10, and may not be repeated (Cardinality: 0..1).

UMM-G ElementECHO 10 PathTypeConstraintsRequired in ECHO10?Cardinality
CloudCoverCloudCoverDecimal

0 - 100

No0..1


Example Mapping

ECHO 10

<CloudCover>50.0</CloudCover>

UMM

"CloudCover": 50.0,

ISO 19115-2 MENDS

The Cloud Cover element is optional in ISO 19115-2. The path may be repeated in ISO, but only the first value provided will be translated to the CMR (Cardinality: 0..1).

UMM-G ElementISO PathTypeNotes
CloudCover

/gmi:MI_Metadata/gmd:contentInfo/gmd:MD_ImageDescription/gmd:attributeDescription/gco:RecordType = CloudCover
/gmi:MI_Metadata/gmd:contentInfo/gmd:MD_ImageDescription/gmd:contentType/gmd:MD_CoverageContentTypeCode codeList="https://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_CoverageContentTypeCode" codeListValue="physicalMeasurement" = physicalMeasurement
/gmi:MI_Metadata/gmd:contentInfo/gmd:MD_ImageDescription/gmd:cloudCoverPercentage/gco:Real = {the actual Cloud Cover value}

Decimal

This element maps to the UMM-G Element Cloud Cover.


Example Mapping

ISO 19115-2 MENDS

<gmi:MI_Metadata>
  <gmd:contentinfo>
    <gmd:MD_ImageDescription>
      <gmd:attributeDescription>
        <gco:RecordType>CloudCover</gco:RecordType>
      </gmd:attributeDescription>
      <gmd:contentType>
        <gmd:MD_CoverageContentTypeCode codeList="https://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_CoverageContentTypeCode" codeListValue="physicalMeasurement">physicalMeasurement</gmd:MD_CoverageContentTypeCode>
      </gmd:contentType>
      <gmd:cloudCoverPercentage>
        <gco:Real>50.0</gco:Real>
      </gmd:cloudCoverPercentage>
    </gmd:MD_ImageDescription>
  </gmd:contentinfo>
</gmi:MI_Metadata>

UMM

"CloudCover": 50.0,

ISO 19115-2 SMAP

The Cloud Cover element currently does not map to ISO 19115-2 SMAP.

UMM-G ElementISO PathTypeNotes
Cloud Cover

N/A

N/A

N/A


Example Mapping

ISO 19115-2 SMAP

N/A

UMM

N/A

UMM Migration

UMM Version 1.4.0Translation DirectionUMM Version 1.5.0




History

UMM Versioning

VersionDateWhat Changed
1.5.001/30/2019No changes were made for Cloud Cover during the transition from version 1.4.0 to 1.5.0.
1.4.008/01/2018No changes were made for Cloud Cover during the transition from version 1.3.0 to 1.4.0.

ARC Documentation

VersionDateWhat ChangedAuthor
1.004/12/2019Recommendations/priority matrix transferred from internal ARC documentation to wiki space

Camille Woods

Jeanne' le Roux

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