taskGNU Astronomy Utilities - Tasks: task #15632, Program to query data servers and...


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task #15632: Program to query data servers and download data

Submitted by:  Mohammad Akhlaghi <makhlaghi>
Submitted on:  Sat 09 May 2020 11:01:55 PM UTC  
Should Start On:  Fri 08 May 2020 11:00:00 PM UTC Should be Finished on:  Fri 08 May 2020 11:00:00 PM UTC
Category:  New program Priority:  5 - Normal
Item Group:  Enhancement Status:  None
Privacy:  Public Percent Complete:  0%
Assigned to:  None Open/Closed:  Open
Effort:  0.00

Sat 09 May 2020 11:01:55 PM UTC, original submission:  

Many data servers allow queries in an anonymous mode through a given URL which can easily be downloaded through a downloader like uURL or Wget, for example see Gaia's command-line access.

A user can simply go and search for each database's standards and apply them for their needs, but that is a lot of trouble and takes time. We can thus add a program to Gnuastro that will be a wrapper over many datasets with a unified command-line interface.

The users just have to specify which database they need to query from, and the various query values can be fed as command-line options, each with a given range.

For example the command bellow will download the Gaia DR2 catalogs around the coordinates (113.649496, 31.888578, the star Castor), within a range of 0.001 degrees and with magnitudes 10 to 15.

astquery --database=gaia-dr2 --ra=113.648496,113.650496 --dec=31.887578,31.889578 --magnitude=10,15 --output=around-castor.fits

The same can be done for image servers when they have a simple interface like this.

Mohammad Akhlaghi <makhlaghi>
Project Administrator


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