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List: kstars-devel
Subject: Re: NGC Thumbnails
From: John S. <myxlflik () hotmail ! com>
Date: 2017-04-17 16:44:18
Message-ID: BLUPR14MB0259B8E17397626C8B7E6F52C7060 () BLUPR14MB0259 ! namprd14 ! prod ! outlook ! com
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Did anyone have any further input on this? Is it worth pursuing and adding=
to Kstars?
________________________________
From: John S. <myxlflik@hotmail.com>
Sent: Saturday, April 15, 2017 11:00 AM
To: Hans
Cc: KStars Development Mailing List
Subject: Re: NGC Thumbnails
Here is a link to the current NGC file tarball and the rudimentary install =
and removal scripts. This has only been tested on Linux Mint, but suspect =
it will be fine on all versions:
https://1drv.ms/u/s!AnSnRFrNRtfXviEYxBIM2pNlmuc6
Here is a link to the current IC file tarball. Same caveats as the NGC fil=
e:
https://1drv.ms/u/s!AnSnRFrNRtfXviLmrzlp6Ru6N7KZ
The images are all of the DSS2R (Red Plate) survey only. There is an abili=
ty to pull data into RGB using the DSS2R, DSS and DSS2B surveys (or really =
any other combination for that matter). I have found that in nearly all ca=
ses, the colors needed subsequent adjustment in order to make the images lo=
ok palatable. I honestly felt the red channel ones and gray scale worked o=
ut just find overall. I know there are some outright bad images in there a=
nd I haven't had the time or inclination to weed through the 13,000 objects=
I pulled to clean it up as of yet. I can certainly do it, but it would la=
rgely depend on how strongly this group felt about it's inclusion. I agree=
it should be an add-on package and not part of the base install. We will =
need to make sure to credit the sources of the images as well.
One thing we may need to consider is directory management. Downloading all=
of these images puts 13,000+ files in the $HOME/.local/share/kstars direct=
ory. That's a pretty good chunk of files for a single directory. I may ma=
ke sense to compile these into some sort of database file or put them in a =
directory structure. I am not a developer though and have NO skill when it=
comes to that aspect of this project.
John
________________________________
From: John S. <myxlflik@hotmail.com>
Sent: Saturday, April 15, 2017 10:15 AM
To: Hans
Cc: KStars Development Mailing List
Subject: Re: NGC Thumbnails
I started this project for my own personal gratification. I personally don'=
t mind that some of the objects are subpar quality. Most of those objects a=
re very interesting to me anyway. However, I would like to make sure that i=
t meets certain quality levels. I am open to input for how to rectify the s=
ituation. I believe the limits of the survey itself will limit the outlet q=
uality though. If you want I'll post the links to the two tarballs for the =
NGC and IC objects and you can download them a try for yourself.
John
> On Apr 15, 2017, at 9:02 AM, Hans <hans@lambermont.dyndns.org> wrote:
>
> Agreed, this is something very nice to have. And it is tedious work too. =
For
> images that don't look too good I expect we'll even get negative remarks,=
but
> that should not inhibit this project. To me having a skimpy image is far =
better
> than no image at all.
>
> Is the idea to have an image library or to dynamically download them on d=
emand ?
>
> -- Hans
>
> Jasem Mutlaq wrote on 20170415:
>
>> I'm attaching a few examples so you can see why we can't use them as is =
in
>> KStars.
>>
>>> On Sat, Apr 15, 2017 at 9:43 AM, Akarsh Simha <akarshsimha@gmail.com> w=
rote:
>>>
>>> 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 goi=
ng
>>> to other surveys.
>>>
>>> Regards
>>> Akarsh
>>>
>>>
>>
>>
>> --
>> Best Regards,
>> Jasem Mutlaq
>
>
>
>
>
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<div id="divtagdefaultwrapper" \
style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif;" \
dir="ltr"> <p>Did anyone have any further input on this? Is it worth pursuing \
and adding to Kstars?<br> </p>
<br>
<br>
<div style="color: rgb(0, 0, 0);">
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, \
sans-serif" color="#000000"><b>From:</b> John S. <myxlflik@hotmail.com><br> \
<b>Sent:</b> Saturday, April 15, 2017 11:00 AM<br> <b>To:</b> Hans<br>
<b>Cc:</b> KStars Development Mailing List<br>
<b>Subject:</b> Re: NGC Thumbnails</font>
<div> </div>
</div>
<div>
<div id="divtagdefaultwrapper" dir="ltr" style="font-size:12pt; color:#000000; \
font-family:Calibri,Arial,Helvetica,sans-serif"> <p>Here is a link to the current NGC \
file tarball and the rudimentary install and removal scripts. This has only \
been tested on Linux Mint, but suspect it will be fine on all versions:</p> <p><a \
href="https://1drv.ms/u/s!AnSnRFrNRtfXviEYxBIM2pNlmuc6" class="OWAAutoLink" \
id="LPlnk121453|2:odcLink" \
previewremoved="true">https://1drv.ms/u/s!AnSnRFrNRtfXviEYxBIM2pNlmuc6</a></p> \
<p><br> </p>
<p>Here is a link to the current IC file tarball. Same caveats as the NGC \
file:</p> <p><a href="https://1drv.ms/u/s!AnSnRFrNRtfXviLmrzlp6Ru6N7KZ" \
class="OWAAutoLink" id="LPlnk131504|2:odcLink" \
previewremoved="true">https://1drv.ms/u/s!AnSnRFrNRtfXviLmrzlp6Ru6N7KZ</a><br> </p>
<br>
<p>The images are all of the DSS2R (Red Plate) survey only. There is an ability \
to pull data into RGB using the DSS2R, DSS and DSS2B surveys (or really any other \
combination for that matter). I have found that in nearly all cases, the colors \
needed subsequent adjustment in order to make the images look palatable. I \
honestly felt the red channel ones and gray scale worked out just find overall. \
I know there are some outright bad images in there and I haven't had the time or \
inclination to weed through the 13,000 objects I pulled to clean it up as of \
yet. I can certainly do it, but it would largely depend on how strongly this \
group felt about it's inclusion. I agree it should be an add-on package and not \
part of the base install. We will need to make sure to credit the sources of \
the images as well.</p> <p><br>
</p>
<p>One thing we may need to consider is directory management. Downloading all \
of these images puts 13,000+ files in the $HOME/.local/share/kstars \
directory. That's a pretty good chunk of files for a single directory. I \
may make sense to compile these into some sort of database file or put them in a \
directory structure. I am not a developer though and have NO skill when it \
comes to that aspect of this project.</p> <p><br>
</p>
<p>John<br>
</p>
<div style="color:rgb(0,0,0)">
<div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, \
sans-serif" color="#000000"><b>From:</b> John S. <myxlflik@hotmail.com><br> \
<b>Sent:</b> Saturday, April 15, 2017 10:15 AM<br> <b>To:</b> Hans<br>
<b>Cc:</b> KStars Development Mailing List<br>
<b>Subject:</b> Re: NGC Thumbnails</font>
<div> </div>
</div>
</div>
<font size="2"><span style="font-size:10pt">
<div class="PlainText">I started this project for my own personal gratification. I \
personally don't mind that some of the objects are subpar quality. Most of those \
objects are very interesting to me anyway. However, I would like to make sure that it \
meets certain quality levels. I am open to input for how to rectify the situation. I \
believe the limits of the survey itself will limit the outlet quality though. If you \
want I'll post the links to the two tarballs for the NGC and IC objects and you can \
download them a try for yourself.<br>
<br>
John<br>
<br>
> On Apr 15, 2017, at 9:02 AM, Hans <hans@lambermont.dyndns.org> wrote:<br>
> <br>
> Agreed, this is something very nice to have. And it is tedious work too. \
For<br> > images that don't look too good I expect we'll even get negative \
remarks, but<br> > that should not inhibit this project. To me having a skimpy \
image is far better<br> > than no image at all.<br>
> <br>
> Is the idea to have an image library or to dynamically download them on demand \
?<br> > <br>
> -- Hans<br>
> <br>
> Jasem Mutlaq wrote on 20170415:<br>
> <br>
>> I'm attaching a few examples so you can see why we can't use them as is \
in<br> >> KStars.<br>
>> <br>
>>> On Sat, Apr 15, 2017 at 9:43 AM, Akarsh Simha \
<akarshsimha@gmail.com> wrote:<br> >>> <br>
>>> Hi<br>
>>> <br>
>>> This is something very nice to have!<br>
>>> <br>
>>> A caveat to consider is the licensing for DSS imagery. They are not<br>
>>> available for commercial use, so we must ship this as an add-on \
through<br> >>> KNewStuff ("Get New Data")<br>
>>> <br>
>>> Other sources of images are SDSS, the Hubble Legacy Archive \
(hla.stsci.edu)<br> >>> and the recently released PanStarrs 1 survey. I \
think the PanStarrs 1<br> >>> survey has a large sky coverage (possibly even \
all sky -- I haven't<br> >>> checked). SDSS has a somewhat small footprint, \
and the Hubble only has<br> >>> objects of interest.<br>
>>> <br>
>>> I didn't quite get what the problem involved is. The DSS is made \
from<br> >>> digitizing scanned plates mostly from the Palomar Observatory \
and UKSTU<br> >>> telescope. The result is that many plates have artefacts, \
and they are<br> >>> completely uncalibrated. Planetary nebulae and bright \
emission nebulae tend<br> >>> to be overexposed. There is no way around \
these problems other than going<br> >>> to other surveys.<br>
>>> <br>
>>> Regards<br>
>>> Akarsh<br>
>>> <br>
>>> <br>
>> <br>
>> <br>
>> -- <br>
>> Best Regards,<br>
>> Jasem Mutlaq<br>
> <br>
> <br>
> <br>
> <br>
> <br>
</div>
</span></font></div>
</div>
</div>
</div>
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</body>
</html>
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