@prefix cpm: . @prefix dc: . @prefix dcat: . @prefix dce: . @prefix dct: . @prefix dcterms: . @prefix grg: . @prefix iop: . @prefix ns0: . @prefix ns1: . @prefix owl: . @prefix pav: . @prefix prov: . @prefix puv: . @prefix qudt: . @prefix rdf: . @prefix rdfs: . @prefix reg: . @prefix sdo: . @prefix semapv: . @prefix skos: . @prefix sssom: . @prefix void: . @prefix xsd: . rdf:type sdo:DefinedTerm ; sdo:description "A fully automatic ceilometer for cloud base height and vertical visibility measurements for use in aviation and meteorological applications. The CL31 detects three cloud layers simultaneously using pulsed diode laser LIDAR (Light Detection and Ranging) technology. The CL31 beam can be directed either vertically or tilted. In the measurement unit, a tilt angle sensor automatically corrects the measured cloud distance reading to vertical cloud base height. The CL31 has a measurement range of 0 to 7.6 km and a reporting resolution of 5m."@en ; sdo:inDefinedTermSet ; sdo:name "Vaisala CL31 Ceilometer for Cloud Height Detection"@en ; sdo:termCode "SDN:L22::TOOL1023" .