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Calibration of a videograph against meteorological optical range derived from standard AES transmissometer measurements / by Brian E. Sheppard = Étalonnage d'un vidéographe par rapport à la portée optique...: En57-58/856-1977E-PDF ; En57-20/856

"A Videograph Visibility Meter is calibrated against Meteorological Optical Range (MOR) derived from standard Atmospheric Environment Service transmissometer measurements. We found that the Videographmeasures MOR to within a factor of two with 99% confidence. This error is as large as that found for the Videograph - prevailing visibility calibration data of 1970-1. A possible explanation of this unexpectedresult is the omission of obstruction to vision distinctions from the analysis. We recommend re-locating this experiment to Toronto International Observing Site to permit the inclusion of prevailing visibility, obstruction to vision and ambient illumination in the data base. With this additional information we can calibrate the Videograph or other scatter-type visibility sensors in terms of MOR for individual weather conditions. Also, we can calculate the meteorological observer's visual contrast threshold as a function of ambient illumination"--Abstract.

Permanent link to this Catalogue record:
publications.gc.ca/pub?id=9.939809&sl=0

Publication information
Department/Agency
  • Canada. Atmospheric Environment Service, issuing body.
TitleCalibration of a videograph against meteorological optical range derived from standard AES transmissometer measurements / by Brian E. Sheppard = Étalonnage d'un vidéographe par rapport à la portée optique météorologique déterminée d'après des mesures effectuées avec le transmissiometre étalon du SEA / par Brian E. Sheppard.
Variant title
  • Étalonnage d'un vidéographe par rapport à la portée optique météorologique déterminée d'après des mesures effectuées avec le transmissiometre étalon du SEA
Series title
  • Technical memoranda, 0068-7804 ; TEC 856
Publication typeMonograph - View Master Record
Language[English]
FormatDigital text
Electronic document
Note(s)
  • ISSN of series should read: 0708-2878.
  • "Published under the authority of the Assistant Deputy Minister"--Cover.
  • "UDC: 551.508.92"--Cover.
  • "12 December 1977"--Cover.
  • Digitized edition from print [produced by Environment and Climate Change Canada].
  • Includes bibliographical references (page 5).
  • Includes abstracts in English and French.
Publishing information
  • Downsview, Ontario : Fisheries and Environment Canada, Atmospheric Environment Service = Pêches et environnement Canada, Service de l'environnement atmosphérique, 1977.
  • ©1978
Author / Contributor
  • Sheppard, B. E. (Brian E.)author.
Description1 online resource (9 pages, 2 unnumbered pages) : illustrations.
ISBN0662020634
Catalogue number
  • En57-58/856-1977E-PDF
  • En57-20/856
Subject terms
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