UV index and UV dose: surface elevation correction
data version 2.0

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UV radiation

UV index
UV dose

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Surface elevation correction

The amount of UV radiation received by someone at the Earth's surface is affected by the local surface elevation: the higher the surface, the more UV radiation. For this reason the UV index and UV dose calculation applies a 5\% increase of the incident UV irradiance per km surface elevation above sea level:
         f(H) = 1 + 0.05·H
where the surface elevation H (in km) is determined from the GMTED2010 global digital elevation model, which is averaged to the UV grid resolution of 0.25°×0.25°.

The averaging provides also a standard deviation, which is propagated to the UV index and UV dose error estimates.

For some more info on the GMTED2010 data and download of the data averaged to different resolutions, see this page.


last modified: 24 July 2017
data product contact: Jos van Geffen & Michiel van Weele & Roanld van der A
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