[task #15780] Query from SDSS imaging database

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?15780>

                 Summary: Query from SDSS imaging database
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Sun 27 Sep 2020 11:32:06 PM BST
         Should Start On: Sun 27 Sep 2020 12:00:00 AM BST
   Should be Finished on: Sun 27 Sep 2020 12:00:00 AM BST
                Category: Query
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

The SDSS imaging database can be queried for the images covering a certain
area at https://dr12.sdss.org/mosaics .

Once you fill the form, the full list of images that cover the desired area is
available in a shell script that can be downloaded from a URL like this:

https://dr12.sdss.org/mosaics/script?onlyprimary=True&pixelscale=0.396&ra=202.469583333&filters=gri&dec=47.1952777778&size=0.2

In this link, I have asked for a region that is centered on M51
(202.469583333, 47.1952777778), within a square box of size 0.2x0.2 degrees,
asking for the native pixel scale (0.396 arcsec/pixel), for the 'g', 'r' and
'i' band images.

>From the given shell script, we can extract the URLs and use cURL to download
the images. Ideally, we can also uncompress them (either by directly calling
'bz2', or using its library).




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