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What differences will there be between data processed in Near-Real-Time and Off-Line?

April 26, 2017Data differences near-real-time off-line processed

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What differences will there be between data processed in Near-Real-Time and Off-Line?

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NRT and off-line products will be identical, but for their level of consolidation and the auxiliary files used in their production (see section 2.10.1 of the AATSR Handbook (see Q7)). Updates to most AATSR auxiliary files will be infrequent, with the exception of the ATS_VC1_AX file containing visible channel calibration coefficients. The version of this file used for NRT processing will not contain the exact coefficients for that orbit. A file from one or two days previous to the acquisition of the orbit in question will be used instead. Under normal circumstances VC1 files used for off-line processing should be no more than 1 day old. For more information on this, see Section 2.11.2 of the AATSR Handbook (see Q7). NRT data are also processed with predicted rather than restituted Orbit State Vectors, but this does not have a significant effect on geolocation/collocation for AATSR.