Author Topic: Where do we get the raw images?  (Read 1911 times)

kwende

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Where do we get the raw images?
« on: October 31, 2012, 03:04:36 pm »
Hello.

I have found that we can download the results of the GalaxyZoo 1 project (the classifications), but I'm interested in where the actual images can be downloaded so that I may cross reference the data? I'm interested in playing with computer vision software to auto-detect a few of these galaxy features.

Alice

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Re: Where do we get the raw images?
« Reply #1 on: November 01, 2012, 12:12:04 am »
Welcome to the zoo kwende!

Most of the images come from the Hubble Space Telescope, and I don't know where to download them (hubblesite.org won't work as far as I know :D). But the ones with a lot of gentle yellows and pinks in them come from the Sloan Digital Sky Survey telescope. If you go to "Examine" after classifying a galaxy, and see an "SDSS number", you will go straight to the original image.

I think those are generally as original as you are going to find them - the Sloan is a robotic telescope and when we started, nobody had seen most of the images before. So they are not already with added artwork or anything.

The Sloan is able to detect where an object is by detecting light. For instance, click "Photometric Objects" here (one of the boxes ont he bottom left). So computer vision software may already have been beaten to it! But it's interesting to try various new approaches.

kwende

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Re: Where do we get the raw images?
« Reply #2 on: November 01, 2012, 03:09:18 pm »
Thanks for your reply.

Oh yes, I'm sure there is vision software out there to do this sort of thing, but I'm just doing it for the fun of it!

I'll post this here for posterity's sake; but the sloan images are available via web services here: http://casjobs.sdss.org/ImgCutoutDR6/ImgCutout.asmx or REST here:   http://casjobs.sdss.org/ImgCutoutDR7/getjpeg.aspx. I have already downloaded 20,000 galaxy images and have started writing software to identify their class by correlating it alongside the Galaxy Zoo data. I will post the results here when I'm done.

Ben

JeanTate

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Re: Where do we get the raw images?
« Reply #3 on: November 15, 2012, 09:35:28 pm »
Thanks for your reply.

Oh yes, I'm sure there is vision software out there to do this sort of thing, but I'm just doing it for the fun of it!

I'll post this here for posterity's sake; but the sloan images are available via web services here: http://casjobs.sdss.org/ImgCutoutDR6/ImgCutout.asmx or REST here:   http://casjobs.sdss.org/ImgCutoutDR7/getjpeg.aspx. I have already downloaded 20,000 galaxy images and have started writing software to identify their class by correlating it alongside the Galaxy Zoo data. I will post the results here when I'm done.

Ben

Cool!  8)

I'm very much looking forward to your results!  :)