{
  "termsOfUse": "https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf",
  "keywordVersion": "draft",
  "schemeVersion": "2025-07-25",
  "viewer": "https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/projects/25bf9da6-a998-4be1-a111-454c1a83746f",
  "lastModifiedDate": "2026-08-18T11:21:44.763Z",
  "uuid": "25bf9da6-a998-4be1-a111-454c1a83746f",
  "prefLabel": "Arcstone",
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  "definitions": [
    {
      "text": "Arcstone is a mission concept that provides a solution to this challenge. An orbiting spectrometer flying on a small satellite in low Earth orbit (LEO) will provide lunar spectral reflectance with accuracy sufficient to establish an SI-traceable absolute lunar calibration standard for past, current, and future Earth viewing sensors and constellation systems.",
      "reference": "https://science.nasa.gov/mission/arcstone/"
    }
  ],
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}