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Data which enhance processing and utilization of remote sensing instrument data. The auxiliary data are not captured by the same data collection process as the instrument data. Auxiliary data include data collected by any other platform or process, preferably in georeferenced digital format. Examples are e.g. meteorological data received from ECWMF or NCEP. Auxiliary data help in data processing, but are also data sets in their own right; ancillary refers to data that exist purely to serve the data processing (e.g. orbit position and velocity).
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