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Not completely off-topic, since it could be used as render-fodder.
http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA15482
--
Tim Cook
http://empyrean.sjcook.com
http://www.lifemax.net/TimCook
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Em 17/03/2012 20:18, Tim Cook escreveu:
> Not completely off-topic, since it could be used as render-fodder.
>
> http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA15482
a 300MB image, woah. :)
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Am 18.03.2012 00:18, schrieb Tim Cook:
> Not completely off-topic, since it could be used as render-fodder.
>
> http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA15482
Thanks for sharing the link.
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On 2012-03-17 19:50, nemesis wrote:
> a 300MB image, woah. :)
What? The full-size Blue Marble image of Earth is a few GB, isn't it?
Never did get back to playing with that...not as much point with Google
Earth available to do a lot more, though.
--
Tim Cook
http://empyrean.sjcook.com
http://www.lifemax.net/TimCook
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Em 17/03/2012 22:07, Tim Cook escreveu:
> On 2012-03-17 19:50, nemesis wrote:
>> a 300MB image, woah. :)
>
> What? The full-size Blue Marble image of Earth is a few GB, isn't it?
> Never did get back to playing with that...not as much point with Google
> Earth available to do a lot more, though.
damn, I'm still living in the 90's... :p
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On 2012-03-17 20:11, nemesis wrote:
>> What? The full-size Blue Marble image of Earth is a few GB, isn't it?
>> Never did get back to playing with that...not as much point with Google
>> Earth available to do a lot more, though.
>
> damn, I'm still living in the 90's... :p
Caveat: the full-size, raw Blue Marble image was split into two
26400x26400(?) parts, one for each hemisphere, but even then most
programs wouldn't load it, even if you had the memory...it's been a few
years since I looked into that, though, and I now have a 64-bit machine
with quite a bit more RAM than I did.
^_^
--
Tim Cook
http://empyrean.sjcook.com
http://www.lifemax.net/TimCook
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Le 18/03/2012 01:50, nemesis a écrit :
> Em 17/03/2012 20:18, Tim Cook escreveu:
>> Not completely off-topic, since it could be used as render-fodder.
>>
>> http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA15482
>
> a 300MB image, woah. :)
>
They use equirectangular projection to map the sphere on a rectangle.
It's probably ok to use map_type 1 of povray to put it back on a sphere.
Notice that they remapped rgb to 3 infrareds: 22, 12 and 3.4 microns.
(Equirectangular is a family: x = lambda.cos(phi_1), y = phi
lambda & phi are longitude & latitude)
plate carrée is usual, with phi_1 as 0, and a picture ratio of 2:1
Indeed, if unstretched, the picture ratio is 2.cos(phi_1), so you can
always get back to a know phi_1 with a simple unidirectional scale.
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On 22/03/2012 8:07 AM, Le_Forgeron wrote:
> Le 18/03/2012 01:50, nemesis a écrit :
>> > Em 17/03/2012 20:18, Tim Cook escreveu:
>>> >> Not completely off-topic, since it could be used as render-fodder.
>>> >>
>>> >> http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA15482
>> >
>> > a 300MB image, woah.:)
>> >
> They use equirectangular projection to map the sphere on a rectangle.
Drat! I cannot get onto the jpl.nasa site but I did manage to find it on
the nasa site at a lower resolution.
http://www.nasa.gov/mission_pages/WISE/multimedia/pia15482.html
Also a Mollweide projection (I think)
http://www.nasa.gov/mission_pages/WISE/multimedia/pia15481.html
And an annotated one.
http://wise.ssl.berkeley.edu/gallery_images/WISE2012-003-A-annotated.jpg
--
Regards
Stephen
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Am 22.03.2012 09:55, schrieb Stephen:
> Also a Mollweide projection (I think)
> http://www.nasa.gov/mission_pages/WISE/multimedia/pia15481.html
They call it Aitoff.
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Le 22/03/2012 18:41, clipka nous fit lire :
> Am 22.03.2012 09:55, schrieb Stephen:
>
>> Also a Mollweide projection (I think)
>> http://www.nasa.gov/mission_pages/WISE/multimedia/pia15481.html
>
> They call it Aitoff.
the difference might be subtle. And is it Aitoff or Hammer-Aitoff ?
(clue: mollweide & hammer-aitoff are equal-area projections)
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Attachments:
Download 'leforgeroncamera_aitoff_hammer.png' (286 KB)
Download 'leforgeroncamera_mollweide.png' (272 KB)
Preview of image 'leforgeroncamera_aitoff_hammer.png'
Preview of image 'leforgeroncamera_mollweide.png'
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