ceilometer
type: Concept
definition: Instrument measuring the height of the cloud base above ground level. The instrument uses either triangulation by projecting a light spot onto the cloud base at a slant angle while varying and measuring the slant angle so the light spot appears over the detector located at a distance and looking upwards, or by shooting a laser pulse vertically upwards to the cloud base and measuring the time until the reflected pulse arrives at the detector located next to the laser.
broader: meteorological base parameter sensor
in scheme: ACTRIS Vocabulary
creator: https://orcid.org/0000-0001-9834-5100

meteorological base parameter sensor
type: Concept
narrower: ceilometer

ACTRIS Vocabulary
type: ConceptScheme