1.We have use satellite images dating from 1980 from reliable sources like NASA, ESA,
KNMI, Environmental CANADA and the Russian Meteorology.
2.
2.We have take ground readings using automatic equipment of proven reliability,
avoiding human intervention in the data gathering and reading
taking process.
3.
3.Satellite data are in
agreement with ground data readings.
4.
4.We have abided to
parameters specified by the UV index.
5.
5.We have made no data
interpretation.
6.
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