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Table of Contents
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Element Description

The Cloud Cover element provides a measurement, as a percentage, of the area of a granule (i.e. an individual data file) that 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 constitutes a cloud. Note that the underlying method used to determine cloud cover can vary by data product. The cloud cover percentage should be expressed as a number between 0-100.  

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).

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Please see the expandable sections below for flowchart details. 


Expand
titleCMR Validation

<>

Expand
titleARC Metadata QA/QC

ARC Priority Matrix

Priority CategorizationJustification

Red = High Priority Finding

Not Applicable

Yellow = Medium Priority Finding

This element is categorized as medium priority when:

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

Blue = Low Priority Finding

Not Applicable

Green = No Findings/Issues

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

ARC Automated Checks

ARC uses the pyQuARC library for automated metadata checks. Please see the pyQuARC GitHub for more information. 

Dialect Mappings

Expand
titleECHO 10

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

Section
Column
width50%

ECHO 10

No Format
<CloudCover>50.0</CloudCover>
Column
width50%

UMM

No Format
"CloudCover": 50.0,
Expand
titleISO 19115-2 MENDS

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

Section
Column
width50%

ISO 19115-2 MENDS

No Format
<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>
Column
width50%

UMM

No Format
"CloudCover": 50.0,
Expand
titleISO 19115-2 SMAP

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

Section
Column
width50%

ISO 19115-2 SMAP

No Format
N/A
Column
width50%

UMM

No Format
N/A

UMM Migration

UMM Version 1.4.0Translation DirectionUMM Version 1.5.0




History

UMM Versioning

VersionDateWhat Changed
1.6.011/4/2019No changes were made for Cloud Cover during the transition from version 1.5.0 to 1.6.0.
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