The final step in a DPAC data reduction cycle is the execution of the MDB
Integrator. The MDB Integrator takes a starting catalogue, represented by the
CompleteSource table in the MDB data model, and updates it with the outputs of
the DPAC cyclic processes such as AGIS, PhotPipe etc. which have previously been
added to the MDB.
For Gaia DR1, the starting catalogue will be the CompleteSource derived from the IGSL (see
Section 2.2.3). The output from the MDB Integrator is a new
version of the CompleteSource table, and this is used both as input for the next
data reduction cycle and for Gaia DR1.
The tables in the Gaia MDB data model used as input by the MDB Integrator are
listed in table 7.1.
Table 7.1: The input tables from Gaia MDB data model.
The CompleteSource table generated from the
IGSL catalogue (2.2.3).
Source records holding the output from AGIS
Output from PhotPipe: This table collects
all the photometric output for each source. Mean calibrated G, BP, RP photometry
and colour are provided (5).
Output from PhotPipe: Continuous
representation of the internally calibrated mean spectra computed by CU5
Output from CU7: It contains information about the
variability, periodicity and classification (6).
7.2.2 Input data description from all DPCs
Author(s): Alex Hutton
For further information on the scientific properties of the input data tables
taken from the MDB and used as input by the MDB Integrator, see the referenced sections in table
7.1. In this section the properties of the input data
are limited to statistics on the number of records and data volume of the
Table 7.2: MDB Integrator Input Records.
No. of records input
Size of input data (bytes)
Note that in this data reduction cycle 01, the NewSource records from IDU
completely replace all NewSource records generated by IDT for the OBMT intervals
which define segments (00) and (01). In the future, it is expected that new
sources generated by IDT will also be used as input by the MDB Integrator.
Also note that the input CompleteSource table used by the MDB Integrator
corresponds to the initial IGSL catalogue and does not correspond to the
CompleteSource catalogue generated at the end of data reduction cycle 00. In
future data reduction cycles it is expected that the input to the MDB Integrator
will be the CompleteSource generated in the previous cycle.
The two previous changes from the nominal operations plan are intended to
reduce the number of new sources generated from spurious detections.