This page provides information about
pipeline processing and data types.
Raw data are selected, associated and inserted into a reduction mechanism
which produces calibration products, science products and quality control
information. This mechanism is the data processing pipeline. There is one such pipeline for each VLT and VLTI instrument.
Find general information about ESO reduction pipelines here.
The main functionalities of the pipelines
create master calibration data,
reduce science frames,
extract QC information from the data.
QC Garching creates master calibration
data from all raw calibration data. The raw data are stored in the ESO Archive and are
public. They are quality-checked and
used for data reduction and for trending.
Before October 2011 QC Garching processed science data, using the
best available, quality-checked master calibration data. As of October 2011 this service is not offered anymore.
There are two instances of the data reduction pipelines:
at the instrument workstation on Paranal, running in automatic mode,
at HQ Garching, run by the Quality Control Group in the optimized
The automatic mode is used for quick look purposes and for on-site
quality control. It processes all raw data sequentially, as they arrive
from the instrument. If calibration products ("master calibrations") are required for processing science data, these are taken from a database with standard, pre-manufactured
calibration products. The automatic mode is not tuned to obtain the best possible
The optimized mode is the mode, which uses all data of a night,
including the daytime calibrations. The calibration data are sorted and grouped according
to their dependencies. Master calibration data are created. Their quality is checked.
UVES PIPELINE: GENERAL
The UVES pipeline was originally written as a MIDAS context.
It then was extended to support FLAMES/UVES data.
In 2007 it was ported to the ESO Common Pipeline Library
framework supporting both UVES and FLAMES/UVES data.
In 2011 Reflex Workflows for UVES were implemented.
The latest CPL version (both in
standalone and integrated into Reflex) of the
pipeline together with documentation (including User manuals
and a Reflex
tutorial) and test/example datasets are available
Find the description of calibration processing and recipes
and science reduction and recipes
MODES AND SETTINGS
The UVES pipelines installed in Garching
and on Paranal support all four flavours of UVES data:
It also processes all FLAMES/UVES data.
The quick-look pipeline on Paranal processes any kind of
Raw UVES frames come in the following CCD formats :
blue arm (1 CCD)
red arm (2 CCDs)
2148 x 3000 px
2x50 = 100 px
4x50 = 200 px
Apart from 1x1 binning, there is also 1x2, 2x2 and 2x3 binning
Master calibration files (master BIAS, master FLAT) have
the prescan and overscan regions chopped off. Master files
for the red arm come in twins for either of the red CCD. Usually
the CCDs are called BLUE, REDU = red upper, and REDL = red
lower. All master files are rotated by 90 degrees. The red
masters are in addition flipped. Blue 1x1 binning master files
have the format 3000x2048 px, red master files 4096x2048 px.
For 2x2 binings, divide these numbers by 2.
Raw calibration files, raw science files, and master calibration
files, have the following approximate sizes in MB: