Element Description

The Day Night Flag element is used to identify whether a granule was collected during the day, night (between sunset and sunrise), or both.


Best Practices

Day Night Flag is a required element under Data Granule. This is a controlled vocabulary field with 4 options: 

  • Day
  • Night
  • Both
  • Unspecified

If no Day Night Flag information is available for the granule, the "Unspecified" value should be used.


Element Specification

The Day Night Flag element is required in UMM-G (Cardinality: 1)

ModelElementTypeConstraintsRequired?Cardinality
UMM-GDataGranule/DayNightFlagEnumeration

Day

Night

Both

Unspecified

Yes1



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.


  • Manual Review
    • Identify errors, discrepancies, or omissions.
    • Proof read all content for conciseness and readability.
  • Automated Review
    • Check that the field has been populated.
    • Check that the field length is not greater than 1,030 characters.
    • Check that the field value does not match the Entry ID.
  • If this element is used, the description sub element is required.
  • The description must have at least 1 character and be no longer than 4000 characters in length.

ARC Priority Matrix

Red = High Priority Finding

This element is categorized as highest priority when:

  • No Day Night Flag is provided (since it is a required element).
  • The Day Night Flag doesn't adhere to controlled vocabulary values: Day, Night, Both, Unspecified.
  • The Day Night Flag provided is incorrect.
Yellow = Medium Priority Finding

Not Applicable

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

ECHO 10

Day Night Flag is required in ECHO 10 (Cardinality: 1)

UMM-G ElementECHO 10 PathTypeConstraintsRequired in ECHO10?Cardinality
DataGranule/DayNightFlagDataGranule/DayNightFlagEnumeration

DAY

NIGHT

BOTH

UNSPECIFIED

Yes1


Example Mapping

ECHO 10

<DataGranule>
  <DayNightFlag>DAY</DayNightFlag>
</DataGranule>

UMM

"DataGranule":
    "DayNightFlag" : "Day",

ISO 19115-2 MENDS

The path where Granule UR is provided in ISO is optional, however, a Granule UR is required for all granule metadata submitted to the CMR (Cardinality: 0..1).

UMM-G ElementISO PathTypeNotes
DataGranule/DayNightFlag

(different contentInfo than MeasurementParameters and AdditionalAttributes)

/gmi:MI_Metadata/gmd:contentInfo/gmd:MD_CoverageDescription [=>

[=>/gmd:attributeDescription/gco:RecordType = DayNightFlag
[=>/gmd:contentType/gmd:MD_CoverageContentTypeCode  codeList="https://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_CoverageContentTypeCode" codeListValue="physicalMeasurement" = physicalMeasurement
[=>/gmd:dimension/gmd:MD_Band/gmd:otherProperty/gco:Record/eos:AdditionalAttributes [===>

[===>/eos:AdditionalAttribute/eos:reference/eos:EOS_AdditionalAttributeDescription/eos:type/eos:EOS_AdditionalAttributeTypeCode codeList="https://cdn.earthdata.nasa.gov/iso/resources/Codelist/eosCodelists.xml#EOS_AdditionalAttributeTypeCode" codeListValue=""contentInformation"" = contentInformation
[===>/eos:AdditionalAttribute/eos:reference/eos:EOS_AdditionalAttributeDescription/eos:name/gco:CharacterString = DayNightFlag
[===>/eos:AdditionalAttribute/eos:reference/eos:EOS_AdditionalAttributeDescription/eos:dataType/eos:EOS_AdditionalAttributeDataTypeCode codeList="https://cdn.earthdata.nasa.gov/iso/resources/Codelist/eosCodelists.xml#EOS_AdditionalAttributeDataTypeCode" codeListValue="string" = string
[===>/eos:AdditionalAttribute/eos:reference/eos:value/gco:CharacterString {the actual value}

String

Maps to the UMM-G element "DayNightFlag"



Example Mapping

ISO 19115-2 MENDS

<gmi:MI_Metadata>
  <gmd:contentInfo>
    <gmd:MD_CoverageDescription>
      <gmd:attributeDescription>
        <gco:RecordType>DayNightFlag</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:dimension>
        <gmd:MD_Band>
          <gmd:otherProperty>
            <gco:Record>
              <eos:AdditionalAttributes>
                <eos:AdditionalAttribute>
                  <eos:reference>
                    <eos:EOS_AdditionalAttributeDescription>
                      <eos:type>
                        <eos:EOS_AdditionalAttributeTypeCode codeList="https://cdn.earthdata.nasa.gov/iso/resources/Codelist/eosCodelists.xml#EOS_AdditionalAttributeTypeCode"codeListValue="contentInformation"> contentInformation</eos:EOS_AdditionalAttributeTypeCode>
                      </eos:type>
                    </eos:EOS_AdditionalAttributeDescription>
                  </eos:reference>
                </eos:AdditionalAttribute>
                <eos:AdditionalAttribute>
                  <eos:reference>
                    <eos:EOS_AdditionalAttributeDescription>
                      <eos:name>
                        <gco:CharacterString>DayNightFlag</gco:CharacterString>
                      </eos:name>
                    </eos:EOS_AdditionalAttributeDescription>
                  </eos:reference>
                </eos:AdditionalAttribute>
                <eos:AdditionalAttribute> 
                  <eos:reference>
                    <eos:EOS_AdditionalAttributeDescription>
                      <eos:dataType>
                        <eos:EOS_AdditionalAttributeDataTypeCode codeList="https://cdn.earthdata.nasa.gov/iso/resources/Codelist/eosCodelists.xml#EOS_AdditionalAttributeDataTypeCode" codeListValue="string">string</eos:EOS_AdditionalAttributeDataTypeCode>
                      </eos:dataType>
                    </eos:EOS_AdditionalAttributeDescription>
                  </eos:reference>
                </eos:AdditionalAttribute>
                <eos:AdditionalAttribute>
                  <eos:reference>
                    <eos:value>
                      <gco:CharacterString>DAY</gco:CharacterString>
                    </eos:value>
                  </eos:reference>
                </eos:AdditionalAttribute>
              </eos:AdditionalAttributes>
            </gco:Record>
          </gmd:otherProperty>
        </gmd:MD_Band>
      </gmd:dimension>
    </gmd:MD_CoverageDescription>
  </gmd:contentInfo>
</gmi:MI_Metadata>

UMM

"DataGranule":
    "DayNightFlag" : "Day",

ISO 19115-2 SMAP

There is currently no mapping between UMM-G and ISO 19115-2 SMAP for Day Night Flag.

UMM-G ElementISO PathTypeNotes
DayNightFlag

N/A

N/A

There is currently no mapping between UMM-G and ISO 19115-2 SMAP for DayNightFlag.


Example Mapping

ISO 19115-2 SMAP

N/A

UMM

N/A

UMM Migration

N/A

History

UMM Versioning

VersionDateWhat Changed
1.6.011/4/2019No changes were made for Day Night Flag during the transition from version 1.5.0 to 1.6.0.
1.5.001/30/2019No changes were made for Day Night Flag during the transition from version 1.4.0 to 1.5.0.
1.4.008/01/2018No changes were made for Day Night Flag during the transition from version 1.3.0 to 1.4.0.

ARC Documentation

VersionDateWhat ChangedAuthor
1.003/26/2019Recommendations/priority matrix transferred from internal ARC documentation to wiki space

Jeanne' le Roux

Ingrid Garcia-Solera

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