PROGRAMMATIC ACCESS
The Programmatic Access to science data products allows the user to perform more complex queries (ADQL) and download data from scripts programmed and run locally which also ensure for long/repetitive sequences of queries. Here you can find an overview on gain programmatic and tool access to the archive science portal utilising the standard interfaces provided by the International Virtual Observatory (VO) Alliance.
The use of VO standards and protocols makes the ESO SAF data discoverable through VO services and tools, which is considered a high level requirement. The standalone tools have powerful generic and/or specific capabilities that cannot be implemented in a general web interface.
Have also a look at the TAP access page to science data products and to catalogues.
If you need help or you have any feedback on accessing and downloading data in a programmatic way, please have a look at the DEMO page or leave a comment here.
Access to Spectroscopic Data: Example #1
The ESO Archive currently contains more than 1.7 million spectra stored in an homogeneous database.
These exquisite quality spectra can be accessed via the Archive Science Portal V2 or programmatically.
For instance, you can follow this notebook to create the image on the right. This shows the Hα line profile as observed with MUSE (red, with a resolution R~3000), XSHOOTER (blue, R~10000), and UVES (green, R~100000) how the star HD 172230. This star is part of the MUSE library of stellar spectra project (Ivanov et al. 2019).
More notebooks showing the power of the programmatic access are here.
Access to Catalogues: Example #2
The ESO archive facility offers the possibility to link information present in catalogues (accessible via the web query interface, or programmatically, or with the Archive Science Portal) with the large amount of science ready data-sets present in the ESO Archive.
For instance, you can follow this notebook to download spectra associated to the most metal poor stars present GAIA-ESO DR3.1 catalogue (see right Figure showing the distribution of these stars in the Teff vs. log g
More notebooks showing the power of the programmatic access are here.
Access to Catalogues: Example #4
Catalogues ingested in the ESO archive via the Phase 3 process are accessible via the ESO Archive Science Portal, or via the Catalog Facility, or programmatically via the `tap_cat` service.
Information from different catalogues can be cross-matched and compared. For instance, in the Figure on the top we plot the distribution the physical properties (effective temperature and gravity) of stars derived from with high-resolution spectroscopic observations of stars by the AMBRE and GAIAESO collections.
The walk-through to obtain this information is illustrated in this notebook (it requires the installation of the un-official ESOAsg python package).
Access to Catalogues: Example #3
Catalogues produced by PIs of ESO observing programmes are integrated into the ESO science archive through the Phase 3 process and are accessible either via the ESO Archive Science Portal, or via the Catalog Facility, or programmatically via the `tap_cat` service.
An example of the large amount of information present in the archive is illustrated by the Figure on the right, where we show the distribution of the first 5,000,000 sources present catalogues that contain data from the ESO-VISTA telescope. (The limit at 5,000,000 was set only for the sake of speeding up the data retrieval.)
The walk-through to obtain this information is illustrated in this notebook (it requires the installation of the un-official ESOAsg python package). The full dataset is also accessible following this Archive Science Portal link (where we we selected all catalogues obtained with VIRCAM and OMEGACAM data) or with the following TAP query:
SELECT
cat_id, collection, table_name, title, number_rows, number_columns,
version, acknowledgment, telescope
FROM
TAP_SCHEMA.tables
WHERE
schema_name = 'safcat' AND
telescope LIKE 'ESO-VISTA%'
More notebooks showing the power of the programmatic access are here.
Access to Catalogues: Example #1
Several catalogues are available in the ESO Archive containing a variety of information ranging from photometry of sources extracted from imaging data products, redshifts and additional physical parameter from spectra, weak lensing shear measurements, etc.
These catalogues can be accessed via the web query interface or programmatically.
For instance, you can follow this notebook to create the image on the right, showing the distribution of point (blue) and extended (red) sources in the colour-colour plane obtained from the VISTA Kilo-degree Infrared Galaxy Survey (VIKING).
More notebooks showing the power of the programmatic access are here.
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