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Global True Color View Of Venus?
elakdawalla
post Aug 8 2005, 06:53 PM
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I'm creating a website with views of the worlds of the solar system, to scale with each other (it'll march up and down the few orders of magnitude necessary), and I am having a terrible time finding a global view of Venus to include in it that fits the criteria I'm trying to apply. To the extent possible, I am searching for:

- Full-disk, global view
- Minimum phase angle available
- Approximate true color, as would be perceived by a human observing the globe from space

For Venus, the only global views I am finding are either based on Magellan data (radar views, nothing like what a human would see) or are colorized ultraviolet views (which greatly overemphasize the visibility of cloud patterns in the Venusian atmosphere). I've seen the lovely partial global view of Venus on Don Mitchell's website -- that's the sort of thing I'm looking for, but I need a full disk. Does anybody have any suggestions? Anybody done any work with Mariner 10 or Galileo data that produces a nice, realistic view?


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scalbers
post Oct 16 2010, 06:06 PM
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Yes indeed the actual contrast is much more subtle than in the Pioneer UV images. For example Ricardo Nune's images show Venus Express processed into approximate RGB, showing rather subtle hues. This procedure might be applied to the Pioneer UV images perhaps, even though these are monochromatic. It's kind of interesting to me to consider whether the human eye can perceive at least some faint contrast/color with Venus. Perhaps it relates to violet light sensitivity that can vary between individuals.

I haven't found too many spectra of Venus or its cloud features. Here is a VIMS spectrum of Venus for reference, though I'm unsure of the field of view.

http://vims.artov.rm.cnr.it/data/res-ven.html

More discussion is here:

http://www.unmannedspaceflight.com/index.p...amp;#entry20237

Here is a book excerpt showing illustrations of visual observations of Venus' clouds, so the contrast is detectable to some, seen right here from planet Earth:

http://books.google.com/books?id=LqwUuMYIE...ope&f=false


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4th rock from th...
post Oct 17 2010, 01:26 PM
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QUOTE (scalbers @ Oct 16 2010, 07:06 PM) *
...It's kind of interesting to me to consider whether the human eye can perceive at least some faint contrast/color with Venus. Perhaps it relates to violet light sensitivity that can vary between individuals...


My personal experience is positive. I can see "something" on Venus through a telescope. My best description would be of a white crescent with some brighter parts. Those bright spots look slightly fluorescent. But it's not obvious, the contrast is very subtle and there's no color at all. Like looking at snow deposited over snow.

I think it has to do with the Rod cells on our eyes. Those are most sensitive to wavelengths of light around 498 nm and are responsable for the Purkinje effect http://en.wikipedia.org/wiki/Purkinje_effect. Perhaps something like that works for Venus.


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- elakdawalla   Global True Color View Of Venus?   Aug 8 2005, 06:53 PM
- - BruceMoomaw   You might look into the images from Pioneer 12...   Aug 8 2005, 06:58 PM
|- - tedstryk   Yes, but I don't think it took multiband image...   Aug 8 2005, 10:09 PM
- - JRehling   QUOTE (elakdawalla @ Aug 8 2005, 11:53 AM)I...   Aug 8 2005, 09:02 PM
- - 4th rock from the sun   My best attempts, using Mariner 10 "clear...   Aug 8 2005, 11:48 PM
|- - elakdawalla   QUOTE (4th rock from the sun @ Aug 8 2005, 04...   Aug 10 2005, 03:39 AM
- - 4th rock from the sun   Ok, here's a Venus atmospheric profile. It s...   Aug 8 2005, 11:55 PM
- - 4th rock from the sun   Check my page http://www.astrosurf.com/nunes/explo...   Aug 10 2005, 12:44 PM
- - 4th rock from the sun   OK, here's all the data I have. This atmosph...   Aug 10 2005, 07:10 PM
- - planet_guy   If you are interested in the surface stuff done by...   Aug 25 2005, 01:17 PM
|- - algorimancer   QUOTE (planet_guy @ Aug 25 2005, 08:17 AM)If ...   Aug 26 2005, 01:09 PM
|- - tedstryk   QUOTE (planet_guy @ Aug 25 2005, 01:17 PM)If ...   Aug 26 2005, 02:00 PM
- - planet_guy   well the 16km/pix are using the 'holes' t...   Aug 26 2005, 03:18 PM
|- - tedstryk   QUOTE (planet_guy @ Aug 26 2005, 03:18 PM)wel...   Aug 26 2005, 03:25 PM
|- - JRehling   QUOTE (tedstryk @ Aug 26 2005, 08:25 AM)Sound...   Aug 26 2005, 03:50 PM
- - planet_guy   trust me.. I'm also hoping the predictions are...   Aug 26 2005, 03:28 PM
- - BruceMoomaw   I promised fully 2 months back to dig up whatever ...   Aug 29 2005, 12:39 AM
- - Tayfun Öner   It is unbelievable that Venus is the nearest plane...   Dec 4 2005, 06:41 PM
|- - JRehling   QUOTE (Tayfun Öner @ Dec 4 2005, 10:41 AM)It ...   Dec 5 2005, 02:03 AM
|- - DonPMitchell   There is a spectral albedo for Venus. That can be...   May 5 2006, 08:49 PM
|- - scalbers   QUOTE (DonPMitchell @ May 5 2006, 08:49 P...   Mar 25 2017, 02:55 PM
- - JRehling   QUOTE (elakdawalla @ Aug 8 2005, 11:53 AM...   Oct 12 2007, 10:32 PM
- - scalbers   Well, I guess this wouldn't be true color, yet...   Oct 12 2007, 10:52 PM
- - Gladstoner   .   Jan 4 2008, 09:05 AM
- - 4th rock from the sun   Hi all, I've updated my webpage with some Ven...   Dec 29 2008, 01:08 PM
|- - ugordan   I've been messing around with the MESSENGER ca...   Jun 1 2009, 06:48 PM
|- - 4th rock from the sun   QUOTE (ugordan @ Jun 1 2009, 06:48 PM) .....   Jun 2 2009, 09:55 AM
|- - ugordan   QUOTE (4th rock from the sun @ Jun 2 2009, 11...   Jun 2 2009, 10:15 AM
- - Stu   Absolutely beautiful images, thanks for posting th...   Jun 1 2009, 08:48 PM
|- - ugordan   Sure, no problem at all, Stu. Glad you like them.   Jun 1 2009, 09:08 PM
- - Stu   Wow, there really would be b****r all to see if yo...   Jun 2 2009, 10:35 AM
|- - ugordan   Yep, and every time I see a montage of all solar s...   Jun 2 2009, 10:43 AM
|- - tedstryk   QUOTE (ugordan @ Jun 2 2009, 10:43 AM) Ye...   Jun 4 2009, 09:42 PM
||- - ngunn   QUOTE (tedstryk @ Jun 4 2009, 10:42 PM) c...   Jun 4 2009, 10:18 PM
|- - Stu   QUOTE (ugordan @ Jun 2 2009, 11:43 AM) Ye...   Jun 4 2009, 11:21 PM
|- - tedstryk   QUOTE (Stu @ Jun 5 2009, 12:21 AM) Every ...   Jun 5 2009, 10:21 AM
- - Juramike   Personally, I don't like the wavelength limita...   Jun 5 2009, 11:08 AM
|- - tedstryk   I would say that there is a difference between fal...   Jun 5 2009, 01:51 PM
- - Stu   The problem I encounter is that editors want to us...   Jun 5 2009, 01:58 PM
|- - tedstryk   I agree, but I still think that showing the Venusi...   Jun 5 2009, 04:41 PM
- - Stu   It's this image I have had to fight to stop ed...   Jun 5 2009, 05:40 PM
|- - tedstryk   Not only is the color bad, but that is a Mariner 1...   Jun 5 2009, 05:44 PM
- - Stu   Okay, but you get the idea, right? Editors can be ...   Jun 5 2009, 05:52 PM
|- - tedstryk   Yes, I get the idea. However, to me, the fact tha...   Jun 6 2009, 10:16 AM
- - brellis   When's Google Venus gonna be up and running?   Jun 5 2009, 08:42 PM
- - scalbers   Is this web page with a Venus image showing some r...   Oct 15 2010, 09:12 PM
|- - CJSF   QUOTE (scalbers @ Oct 15 2010, 05:12 PM) ...   Oct 16 2010, 12:26 AM
|- - scalbers   QUOTE (CJSF @ Oct 16 2010, 12:26 AM) I ag...   Oct 16 2010, 05:53 PM
|- - ugordan   It's not merely about color, it's about co...   Oct 16 2010, 06:01 PM
- - machi   It looks like old UV image from Pioneer Venus. I ...   Oct 15 2010, 09:26 PM
- - 4th rock from the sun   Here's my Pioneer Venus image galery: http://w...   Oct 16 2010, 03:33 PM
- - Phil Stooke   Nice set of pictures! The last image on your ...   Oct 16 2010, 04:18 PM
- - scalbers   Yes indeed the actual contrast is much more subtle...   Oct 16 2010, 06:06 PM
|- - 4th rock from the sun   QUOTE (scalbers @ Oct 16 2010, 07:06 PM) ...   Oct 17 2010, 01:26 PM
|- - scalbers   QUOTE (4th rock from the sun @ Oct 17 2010, 0...   Oct 17 2010, 08:59 PM
- - EDG   Has anyone actually tried to make a true-colour ma...   Oct 17 2010, 12:52 AM
- - nprev   I don't know how you could ever make a 'tr...   Oct 17 2010, 01:37 AM
|- - EDG   QUOTE (nprev @ Oct 16 2010, 06:37 PM) I d...   Oct 17 2010, 07:02 PM
|- - tedstryk   How on earth would that be any less simulated than...   Oct 17 2010, 07:45 PM
|- - EDG   QUOTE (tedstryk @ Oct 17 2010, 11:45 AM) ...   Oct 17 2010, 09:20 PM
- - JohnVV   QUOTE Has anyone actually tried to make a true-col...   Oct 18 2010, 02:53 AM
- - JRehling   A long-dormant thread awakens! I think one th...   Mar 26 2017, 10:12 PM
|- - JRehling   This video not only has a nice overview of the Aka...   Jun 11 2017, 05:59 PM
- - JohnVV   some guesses at 1:15 i would say venus express a...   Jun 11 2017, 06:32 PM
- - JRehling   This may be about as good as you can get from Eart...   Jun 26 2017, 05:20 AM


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