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The total ozone maps are based on ground-based measurements available from the
World Ozone and Ultraviolet Radiation Data Centre.
Preliminary near real-time data from ground-based observations were also used for the most recent maps.
Total ozone values are given in
Dobson Units.
The numbers represent observations taken from ground stations situated at the bottom left corner of the number.
Maps of deviations represent total ozone deviations from the 1978-1988 level estimated using
Total Ozone Mapping Spectrometer (TOMS)
data for all areas except the Antarctic and from the pre-1980 level estimated using Dobson data over the Antarctic.
Over areas with poor data coverage adjustments are made according to
TOMS
on Nimbus-7, Meteor-3, ADEOS and Earth Probe satellites.
Over the polar night area Dobson and Brewer moon observations and/or
NOAA's TIROS Operational Vertical Sounder (TOVS)
satellite data are used.
TOVS data are also used when the more reliable TOMS data are not available.
The mapping algorithm is similar to those used by the
WMO Ozone Mapping Centre.
The day part of the “Start date” can specify a day (1 to 31),
a mean over the entire month (1-end) or the mean of a “10-day” period
during the month (1-10, 11-20 or 21-end, which might be
8 or 9 or 11 days).
It must logically correspond to the unit of the “Interval”.
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