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List:       kstars-devel
Subject:    Re: NGC Thumbnails
From:       Akarsh Simha <akarshsimha () gmail ! com>
Date:       2017-04-15 6:43:36
Message-ID: CA+9k5twPDdJBQKLkc-Q=vQL1j9ed+HE01BGN-5e9rjBMdGDXYA () mail ! gmail ! com
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Hi

This is something very nice to have!

A caveat to consider is the licensing for DSS imagery. They are not
available for commercial use, so we must ship this as an add-on through
KNewStuff ("Get New Data")

Other sources of images are SDSS, the Hubble Legacy Archive (hla.stsci.edu)
and the recently released PanStarrs 1 survey. I think the PanStarrs 1
survey has a large sky coverage (possibly even all sky -- I haven't
checked). SDSS has a somewhat small footprint, and the Hubble only has
objects of interest.

I didn't quite get what the problem involved is. The DSS is made from
digitizing scanned plates mostly from the Palomar Observatory and UKSTU
telescope. The result is that many plates have artefacts, and they are
completely uncalibrated. Planetary nebulae and bright emission nebulae tend
to be overexposed. There is no way around these problems other than going
to other surveys.

Regards
Akarsh

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<div dir="ltr"><div><div><div><div>Hi<br><br></div>This is something very nice to have!<br><br></div>A \
caveat to consider is the licensing for DSS imagery. They are not available for commercial use, so we \
must ship this as an add-on through KNewStuff (&quot;Get New Data&quot;)<br><br></div><div>Other sources \
of images are SDSS, the Hubble Legacy Archive (<a href="http://hla.stsci.edu">hla.stsci.edu</a>) and the \
recently released PanStarrs 1 survey. I think the PanStarrs 1 survey has a large sky coverage (possibly \
even all sky -- I haven&#39;t checked). SDSS has a somewhat small footprint, and the Hubble only has \
objects of interest.<br><br></div><div>I didn&#39;t quite get what the problem involved is. The DSS is \
made from digitizing scanned plates mostly from the Palomar Observatory and UKSTU telescope. The result \
is that many plates have artefacts, and they are completely uncalibrated. Planetary nebulae and bright \
emission nebulae tend to be overexposed. There is no way around these problems other than going to other \
surveys.<br><br></div><div>Regards<br></div><div>Akarsh<br><br></div></div></div>



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