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vlkb-soda

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    README.md

    vlkb-soda

    is a web-application to access astronomical data stored in FITS-files. It implements SODA IVOA recommendation v1.0 (https://ivoa.net/documents/SODA/20170517/index.html).

    It can be used with vlkb-siav2 (https://ict.inaf.it/gitlab/ViaLactea/vlkb-siav2) to provide complete data discovery and access service.

    The SODA docker image is available in this repository and may be launched by an compose.yaml as in this example:

    version: '3' 

services:

  soda:
    container_name: soda-vlkb
    image: git.ia2.inaf.it:5050/vialactea/vlkb-soda/soda:1.6.3
    ports:
      - 18019:8080
    environment:
      - ACCESS_CONTEXT_ROOT=ska#datasets
    volumes:
      - /srv/ska/surveys:/srv/surveys:z,ro
    restart: always

    The port number, ACCESS_CONTEXT_ROOT and directory to FITS-files must be adjusted for the given instance.

    The above configuration example assumes:

    • 'SKA' project holds FITS-files in sub-directories under: /srv/ska/surveys
    • will be accessed remotely by URL: http://<server>/ska/datasets/soda
    • identified by SODA-param ID which is an IVOID of the form:

    ID=ivo://<authority>/<resource-key>?<relative-pathname>#extnum

    The service decodes IVOID part after the question mark '?'.

    The pathname in the ID is relative to the path in compose.yaml volume-mapping (e.g. /srv/ska/surveys).

    The FITS extension number #extnum is optional. Default is the primary HDU.

    Note that the service appends 'soda' to ACCESS_CONTEXT_ROOT. Then, a data access example:

    curl -s -k --get
    --data-urlencode "ID=ivo://some-auth/some-key?some/path/somefile.fits"
    --data-urlencode "CIRCLE=202.256 47.493 0.2"
    -v -o soda.fits
    http://localhost:18019/ska/datasets/soda

    cuts the file /srv/ska/surveys/some/path/somefile.fits.

    The root URL http://localhost:18019/ska/datasets/soda returns the service descriptor.

    SODA for VLKB

    Additionally to SODAv1 it also provides VLKB-specific functions:

    • the filtering paramters (POS, BAND) can be given in GALACTIC and VELO-LSRK-km/s coordinates systems
    • supports non-WCS cuts by pixels grid
    • inserts additional metadata (RESTFREQ, CUNIT) if not present in FITS-headers
    • can create and hold a cut-file server-side for later download, and
    • provides count of undefined values in the cut-file

    If the cuts are hold server-side also the following needs ot be configured:

    • RESPONSE_FORMAT : application/x-vlkb-xml (default is application/fits)
    • URL_CUTOUTS : server-side cuts can be downloaded form this URL

    Installation

    The service consists of

    • vlkb-soda web-application and associated vlkbd daemon to access FITS file contents based on VO SODA
    • vlkb command line utility to perform some of the functionalities of the web-applications on command line

    There are rpm, deb and war packages avaialable for Debian, CentOS and Fedora.

    Install from packages (rpm/deb and war)

    There is a war-package for the cutout web-application

    • vlkb-soda-X.Y.Z.war

    And two packages for linux executables (deb or rpm)

    • vlkbd-X.Y.Z.deb implements the cutout engine and should be installed together with vlkb-cutout-*.war
    • vlkb-X.Y.Z.deb is a optional utility

    Additionally optional vlkb-obscore utility for the vlkb-search web-app:

    • vlkb-obscore-X.Y.Z.deb is a optional tool to create ObsCore table for vlkb-search-*.war

    To download version X.Y, add one of the above package names to

    FIXME   curl -O --header "PRIVATE-TOKEN: <security-token>"  "https://ict.inaf.it/gitlab/api/v4/projects/79/packages/generic/vlkb-datasets/X.Y/<package-name>"