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 Post subject: How did this happen?
PostPosted: Fri Apr 15, 2011 1:51 pm 
Planning a route out only to find this on google earth:

Image

Any ideas on what caused this? :shock:

Im stumped, I guess something to with refraction through the atmosphere possibly or maybe the red, green and blue filters over different pixels? Maybe to do with the lens being focussed at ground level and the plane being at some altitude?


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 Post subject:
PostPosted: Fri Apr 15, 2011 2:46 pm 
Clearly its a UFO. C'mon now.

:lol:


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 Post subject:
PostPosted: Fri Apr 15, 2011 3:26 pm 
Ah yes thanks!


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 Post subject:
PostPosted: Fri Apr 15, 2011 5:30 pm 
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Could it also be with the satellite (at some orbiting speed) intending to photograph the earth (at a fixed speed), but the plane is moving at a different speed that the earth.

Makes me wonder if more than one shot is taken at once...

With more questions now than answers,

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 Post subject:
PostPosted: Fri Apr 15, 2011 5:44 pm 
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Displacement between multiple shots wouldn't give the white plane. That suggests this was a single shot.

Now what mechanism can cause a secondary image? A diffraction grating or other refraction effect are possible candidates, but I'm not sure about that either. For starters, the colour order isn't right. The order should be red/green/blue not with red in the middle. Also, assuming a broad spectrum source, it would blur between each other, not give three distinct colours.

The three distinct colours does suggest more towards some capture issue, but there still would need to be some mechanism to generate the secondary image in the first place...

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 Post subject:
PostPosted: Fri Apr 15, 2011 8:41 pm 
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Could it be that the camera on the satellite has one image sensor for each primary color? (Much like a 3CCD video camera or foveon)

Some discussion about it here: (Looks like people call it "RGB shadowing")
http://www.petapixel.com/2010/12/09/wha ... e-cameras/

Nice find btw, really cool effect! =D

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 Post subject:
PostPosted: Fri Apr 15, 2011 8:53 pm 
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The petapixel sample is different from this one. Here we have a normal looking plane as well as the coloured "ghosts".

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 Post subject:
PostPosted: Fri Apr 15, 2011 8:54 pm 
Sweet thanks for the link Lorride!

Looks like the photos are taken on some sort of triple pass, one for each RGB channel. Obviously the plane is travelling fast enough for each channel to be out of sync in relation to the stationary ground. Cars seem to travel slow enough to be fine.

Not quite sure why the "regular" plane is there as well as Popo mentions :?

Also this means that the sensor that took this isnt foveon like (most of) our cameras are, but can detect each channel individually at will.

MrKman wrote:
With more questions now than answers


Ah, the beauty of Physics!


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 Post subject:
PostPosted: Fri Apr 15, 2011 8:55 pm 
@Popo, possibly a conventional photograph was taken just before in order to put together the individual channel photographs?


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 Post subject:
PostPosted: Fri Apr 15, 2011 9:11 pm 
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popo wrote:
The petapixel sample is different from this one. Here we have a normal looking plane as well as the coloured "ghosts".


True, but it's a similar effect so it's not completely off ^^

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 Post subject:
PostPosted: Sat Apr 16, 2011 4:30 am 
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certainly interesting effect. The discussions in the above link sound pretty good, but its all over my head.

Its not just the plane the vapour trail is also separated. Like the 3 colour sensor are a separate sensor. That accounts for the shift with the sensors optimised to take photos on the ground, I guess. There is also a shadow on the rudder indicating that there is an angle involved. So varying distance to the subject from a number of sensors?

Do they then use a fourth sensor, where the plane is a separate shot, Something that captures light levels or something as the plane looks white?

Maybe its a back up camera that is more of a traditional sensor and when all the data is put together ..............



I got it, I wonder if Chuck Norris is on the plane? :D

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