Timestamp for hourly time series
For representing hourly summaries we use centre of summarization (averaging) interval as default. This means that time intervals 00:00-01:00, 01:00-02:00 .... 22:00-23:00, 23:00-24:00 are represented by time stamps 00:30, 01:30 .... 22:30, 23:30.
On request, we can also deliver data with time stamp set as end of summarization (averaging) interval. In such case time intervals 00:00-01:00, 01:00-02:00 .... 22:00-23:00, 23:00-24:00 will be represented by time stamps 01:00, 02:00 .... 23:00, 00:00
The type of time stamp used will always be mentioned along with other meta information in the data files delivered.
Timestamp for 15/30 minute time series
In the case of sub-hourly time series, data values represent instantaneous values and not summary over a 15 or 30 minute period. When the time series is in original time resolution ( i.e 15 minutes for Meteosat PRIME satellite, 30 minutes for Meteosat IODC satellite), data is represented in the time stamp of satellite data acquisition. This helps to avoid degradation of the information content by temporal interpolation.