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  #151 (permalink)  
Old 03-August-2009, 10:28 PM
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Originally Posted by rodin View Post
I thought you people had a sense of humour.
I guess the idea that there would be a leaf on a Planet with absolutely no vegetation is pretty funny.
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  #152 (permalink)  
Old 03-August-2009, 10:32 PM
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Or a flint arrowhead?
Ah, classic Clovis point. Well done, that man!
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  #153 (permalink)  
Old 04-August-2009, 12:42 AM
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I thought you people had a sense of humour.
No we don't. That's why the fun & games section is around. Training. It's to be closed when someone comes up with something original and funny. My bet's on dark energy being found first.
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  #154 (permalink)  
Old 04-August-2009, 01:51 PM
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Originally Posted by maggador View Post

If the "moving rover" proposition is valid, I would like to ask anyone who can supply me with some similar images with similar effects of objects taken here on Earth, showing an object behind other objects moving and dissapearing from right all the way to the left of the image while the perspective and angle of the other objects remain rather similar.

thanks
Well, I´m very late with my response, and I haven´t followed this thread in detail.

Anyhow, how about this example from my backyard? I swear, I haven´t moved anything you can see in the picture(s)! Neither the stool, nor the deck chair
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Last edited by dhd40; 04-August-2009 at 01:55 PM.. Reason: ETA: Unless van Rijn´s elf .....
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  #155 (permalink)  
Old 04-August-2009, 02:21 PM
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Anyhow, how about this example from my backyard?
An obvious fake, looks like more of Kubrick's work.
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  #156 (permalink)  
Old 04-August-2009, 02:48 PM
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You'll have to do a better job of faking your photos, dhd40. Those shadows aren't even parallel.
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  #157 (permalink)  
Old 04-August-2009, 03:15 PM
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You'll have to do a better job of faking your photos, dhd40. Those shadows aren't even parallel.
OMG, and no stars visible
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  #158 (permalink)  
Old 04-August-2009, 04:28 PM
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Anyhow, how about this example from my backyard?
Good example. I took some similar photographs using mountains some years ago to address the claim that foreground objects in lunar photographs can move significantly though the background remains unchanged. My first attempts actually overshot the mark. This is what laymen don't understand: parallax effects are not subtle. It requires surprisingly little movement between two vantage points in order to achieve a fairly large parallax shift.
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  #159 (permalink)  
Old 04-August-2009, 04:38 PM
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Ah geometry... one half of a lovely G&T.

That sort of stuff is often not as obvious as you might initially expect.
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Old 04-August-2009, 05:01 PM
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This is what laymen don't understand: parallax effects are not subtle. It requires surprisingly little movement between two vantage points in order to achieve a fairly large parallax shift.
Yes, I was surprised myself. The distance between camera and stool/deck chair is approx. 20 m. The two vantage points were approx. a mere 80 cm apart.
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  #161 (permalink)  
Old 04-August-2009, 05:05 PM
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Ah geometry... one half of a lovely G&T.

That sort of stuff is often not as obvious as you might initially expect.
What´s the meaning of G&T ?
(I didn´t have Gin and Tonic when taking the pictures! )
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1 + ei*pi = 0
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  #162 (permalink)  
Old 04-August-2009, 05:35 PM
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At a guess, geometry and trigonometry.
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  #163 (permalink)  
Old 04-August-2009, 07:16 PM
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Sorry, yes, geometry & trigonometry.

They were paired up at my high school. I had assumed this was commonly done. Let that be a lesson to myself - assumptions will often lead to error.

ETA - That'll teach me for going for the cheap jokes.
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  #164 (permalink)  
Old 04-August-2009, 08:44 PM
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Originally Posted by Spoons View Post
Sorry, yes, geometry & trigonometry.

They were paired up at my high school. I had assumed this was commonly done. Let that be a lesson to myself - assumptions will often lead to error.

ETA - That'll teach me for going for the cheap jokes.
When I was in school, geometry was a separate single-semester course, and trigonometry was taught as part of the algebra class.

Rob
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  #165 (permalink)  
Old 04-August-2009, 09:22 PM
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Sorry, yes, geometry & trigonometry.
Of course! I should have found out myself. Gillianren did (as always, thanks)

Quote:
They were paired up at my high school.
Lucky man, you still remember. Not me, 53 years (after high school) wash away ...
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1 + ei*pi = 0
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  #166 (permalink)  
Old 04-August-2009, 09:46 PM
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Originally Posted by dhd40 View Post
Well, I´m very late with my response, and I haven´t followed this thread in detail.

Anyhow, how about this example from my backyard? I swear, I haven´t moved anything you can see in the picture(s)! Neither the stool, nor the deck chair
Obviously fake. The shadows are all wrong and stuff like that.
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  #167 (permalink)  
Old 04-August-2009, 10:14 PM
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Originally Posted by JayUtah View Post
This is what laymen don't understand: parallax effects are not subtle. It requires surprisingly little movement between two vantage points in order to achieve a fairly large parallax shift.
I suspect that any misunderstanding is compounded by the MER panoramic camera's relatively narrow field of view of 16°. The lenses behave more like telephoto lenses than like the "50mm" lenses that most people are used to (which have a field of view in the neighborhood of 40°), and that tends to compound the problem of trying to intuit the three-dimensional arrangement of the objects in the picture since a tight field of view tends to compress apparent distances in the resulting photograph.
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  #168 (permalink)  
Old 04-August-2009, 10:44 PM
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ETA - That'll teach me for going for the cheap jokes.
FWIW the (mistaken) gin & tonic reference worked for me. I even smiled a little.

dhd40, it might work even better in grayscale, considering the rover pics are too.
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  #169 (permalink)  
Old 04-August-2009, 11:04 PM
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Rather than making poorly informed visual guesses at the range to a rock in a MER stereoscopic image pair, a quantitative measurement tool exists. To determine range and distance between points in MER stereoscopic pairs (both PanCam and NavCam), use Clark Andersen's utility AlgorimancerPG v.4.0.5. found at

http://www.clarkandersen.com/RangeFinder.htm

Many simple questions (Which camera took this image? Are these two images stereoscopic pairs taken simultaeously? How much time elapsed between when these images were taken? Which wavelength filter was used in this image?) can be answered by understanding the file naming convention. A basic breakdown is available at

http://sse.jpl.nasa.gov/news/display.cfm?News_ID=7761

and a more comprehensive document with additional useful information is available at

http://pds-geosciences.wustl.edu/mer...sers_guide.pdf
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  #170 (permalink)  
Old 05-August-2009, 03:05 AM
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Quote:
Originally Posted by robross
When I was in school, geometry was a separate single-semester course, and trigonometry was taught as part of the algebra class.
I think the arrangement we had was... let me see... Year 11 (second last year of high school) First semester - Geometry & Trig as one subject, and Applied Mathematics. Second semester G&T changed to Intro Calc.

Year 12, full year - Applied Math, and Calculus.

Apologies for the derailment, just wanted to close out that area of chit-chat.
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  #171 (permalink)  
Old 05-August-2009, 03:19 PM
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Obviously fake. The shadows are all wrong and stuff like that.
psst! Don´t tell the Moon Hoaxers!
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  #172 (permalink)  
Old 05-August-2009, 03:31 PM
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dhd40, it might work even better in grayscale, considering the rover pics are too.
At your service.
Although, grayscale isn´t that easy on Titan, as you can easily see from the typical Titan tint (that´s where my backyard is).
My head explodes with dark forbodings that, again, I will be accused of faking
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1 + ei*pi = 0
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  #173 (permalink)  
Old 05-August-2009, 03:53 PM
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If you look closely, you can clearly see an artificial structure, it looks like it's in the shape of a humanoid face.

We need higher resolution photos!
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  #174 (permalink)  
Old 18-August-2009, 06:38 AM
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Quote:
Originally Posted by maggador View Post
Ok so here goes:...

What the HECK is that object and how does it MOVE around like that?...
Good Lord! The first shot is an extreme telephoto shot from a distance. The rock is clearly visible in the second photo in its correct location but from a different perspective. Likewise, the rock in the third photo also is clearly visible in the second photo in it correct location, that apparent location once again shifted by perspective.

Or do I need to wastefully devote my time to creating a web page which clearly explains and shows what I just described?

I'm not trying to mess with you maggador. Your mind obviously has the "gift" of instantly spotting things which appear out of place. This is a left over built-in and hard-wired survival instinct within your brain. Specifically, to discern patterns which seem to be out-of-place (lion hiding in the grass or whatever). Now, relax your mind and put your thinking cap on, and look at the photos again. First, get an idea of the perspectives at which each photo was taken from by looking in general at the orientations of the various rocks and the overall depth-of-field. Look at the shadows to tell if it is a wide-angle or a telephoto zoomed photo.

Here is the cool thing. You may have a wired mind which automatically lets things "stand out" to you. Thats good. Now you have to train your mind to properly interpret what you see. Yet the "stand out" thing is a good thing since you might spot something important, interesting and real which trained scientists might have missed. My mind works this way. Yet I have had to train my mind to not misinterpret what I am seeing. Have some fun and do a Google search on "optical illusions" for some pretty interesting examples of how our brains fool us in interpreting what we see.

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Old 18-August-2009, 07:57 AM
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"Well I asked about the pics on BAUT and they say it's a lion hiding in the grass on Mars!"
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