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  <gcmd:gcmd>
    <gcmd:termsOfUse>https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf</gcmd:termsOfUse>
    <gcmd:keywordVersion>24.7</gcmd:keywordVersion>
    <gcmd:schemeVersion>2026-09-02T10:49:22.496Z</gcmd:schemeVersion>
    <gcmd:viewer>https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/54aa2648-70cf-434b-832e-8bbd8460efdf</gcmd:viewer>
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  <skos:Concept rdf:about="54aa2648-70cf-434b-832e-8bbd8460efdf">
    <skos:broader rdf:resource="457883c4-b30c-4d26-bed8-6c2887ebbc90"/>
    <skos:prefLabel xml:lang="en">BACKSCATTER</skos:prefLabel>
    <skos:changeNote>Date=2026-02-18 User Id=tstevens User Note=added new science keyword</skos:changeNote>
    <skos:changeNote>Date=2026-02-18 User Id=system System Note=Added broader relation from BACKSCATTER [54aa2648-70cf-434b-832e-8bbd8460efdf] to OCEAN OPTICS [457883c4-b30c-4d26-bed8-6c2887ebbc90]</skos:changeNote>
    <gcmd:reference gcmd:text="https://oceanservice.noaa.gov/facts/backscatter.html" xml:lang="en"/>
    <skos:definition xml:lang="en">The reflection of a signal, such as sound waves or light, back in the direction from where it originated. Often used from soundwaves to help understand sea floor characteristics.</skos:definition>
    <dcterms:modified>2026-02-18T14:52:48.946Z</dcterms:modified>
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