A visiometer is an instrument to aid the estimation of visibility at a meteorological station. Visiometers are used by observation stations worldwide before data is used by the Met Office and later accumulated in the MIDAS dataset.
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More Information (under review)
The Met Office Fact-sheet #17 – Weather Observations on Land describes the instrumentation further and includes diagrams of the apparatus set-up.
For more information on which instruments are used to collect measurements within specific station networks, the Met Office Surface Data Users Guide, describes the meteorological surface data and how it is obtained in the Met Office Database - MIDAS.
If you have queries about these pages or about obtaining the Met Office surface stations data from the BADC then you should contact CEDA Support. Your query should be answered within one working day. When follow-up work is required, the CEDA support will carry out the work as quickly and efficiently as possible, and in any case, the user will be kept informed of progress.