NGC Thumbnails

Tue Apr 18 12:13:55 UTC 2017

Yup we can publish an updated version if we get better data

On Tue, Apr 18, 2017 at 2:59 PM, John S. <myxlflik at hotmail.com> wrote:

> Oh wow.  I thought you wanted to try to work on them some more.  Assuming
> we can get better images for  this, what will the process be to update this
> now that it is incorporated?  Just publish a new version and have them
> download it via that data downloads in Kstars?
>
>
> ------------------------------
> *From:* Jasem Mutlaq <mutlaqja at ikarustech.com>
> *Sent:* Tuesday, April 18, 2017 4:38 AM
> *To:* John S.
> *Cc:* Hans; KStars Development Mailing List
> *Subject:* Re: NGC Thumbnails
>
> I just added them to KStars. I used your name "John S." and email address.
> Please let me know if you want to change any of those as they appear in the
> download dialog. I'll try to add previews as well since we do not have
> previews for _any_ download before.
>
> On Mon, Apr 17, 2017 at 7:44 PM, John S. <myxlflik at hotmail.com> wrote:
>
>> Did anyone have any further input on this?  Is it worth pursuing and
>> adding to Kstars?
>>
>>
>>
>> ------------------------------
>> *From:* John S. <myxlflik at 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
>> file:
>>
>> https://1drv.ms/u/s!AnSnRFrNRtfXviLmrzlp6Ru6N7KZ
>>
>> 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.
>>
>>
>> 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.
>>
>>
>> John
>> ------------------------------
>> *From:* John S. <myxlflik at 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 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.
>>
>> John
>>
>> > On Apr 15, 2017, at 9:02 AM, Hans <hans at 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
>> demand ?
>> >
>> > -- 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 at gmail.com>
>> wrote:
>> >>>
>> >>> 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
>> >>>
>> >>>
>> >>
>> >>
>> >> --
>> >> Best Regards,
>> >> Jasem Mutlaq
>> >
>> >
>> >
>> >
>> >
>>
>
>
>
> --
> Best Regards,
> Jasem Mutlaq
>
>

-- 
Best Regards,
Jasem Mutlaq
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