2.10 Latency, Throughput and Data Volume
AATSR acquires data continuously around the
orbit, in all channels. At night,
the visible channels continue to operate
even though the data they acquire contain
AATSR products will be provided in their
unconsolidated form in NRT, and as
consolidated products when processed
off-line. Unconsolidated data are processed from
dump to dump. Consolidated data are
time-ordered, with no overlaps or
data gaps and processed from ANX to ANX.
NRT and off-line products will be identical, but
for their level of
consolidation and the auxiliary files used in
their production. 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 that
1 day old. For more information on
this, see Section 2.9.2 on L1b
Auxiliary Files and Section 2.11.2 on
Characterisation and Calibration.
NRT data will also be processed with
predicted rather than restituted Orbit State Vectors.
AATSR processing does not use any auxiliary files
sourced externally to the PDS (e.g.
ECMWF files). Therefore, the
time required to receive these files
does not represent a potential block
to AATSR processing.
Column 4 of Table 2.35 shows the time between
acquisition and availability to
end-users for all AATSR products.