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[task #15780] Query from SDSS imaging database
From: |
Mohammad Akhlaghi |
Subject: |
[task #15780] Query from SDSS imaging database |
Date: |
Sun, 27 Sep 2020 18:32:08 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:81.0) Gecko/20100101 Firefox/81.0 |
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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