@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/72227178-bb4c-4ff5-98a3-f976aa3f3714>
  skos:prefLabel "Photon/Optical Detectors"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/fe7c93d2-1460-4292-9dda-2338c3f6120d> .

<https://gcmd.earthdata.nasa.gov/kms/concept/fe7c93d2-1460-4292-9dda-2338c3f6120d>
  skos:definition """Ceilometers are devices using a laser or other light source to
determine the height of a cloud base. An optical ceilometer uses
triangulation to determine the height of a spot of light
projected onto the base of the cloud; a laser ceilometer
determines the height by measuring the time required for a pulse
of light to be scattered back from the cloud base.

Additional information available at
"http://www.wikipedia.org/wiki/Ceilometer\""""@en ;
  skos:prefLabel "CEILOMETERS"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/72227178-bb4c-4ff5-98a3-f976aa3f3714> ;
  a skos:Concept .