It's about Venus

[MiR]

While i was searching for more informations about Venus i was wondering about the different - so called - "true color" images of the planet Venus.
What are the real color(s) of the Venus-atmosphere? I've found these entries by "4th rock from the sun" at unmannedspaceflight:
http://www.unmannedspaceflight.com/index.php?showtopic=1243
Or:
What are the real colors of the Venusclouds (in visible light)? Mostly Venus is showing with a white-yellowish cloudcolor with a blueish haze.
http://wanderingspace.net/category/venus/
http://www.mentallandscape.com/Venus_Visible.htm
http://www.planetary.org/explore/topics/venus/facts.html
http://www.astrosurf.com/nunes/explor/explor_vex.htm
But in Celestia Venus has much more darker clouds. Maybe anyone could give me an answer...?
Thanks
Michael

[MiR]

Oops - I've just read some earlier topics of Venus... and i wasn't amused... but, now i understand.

Because there are so much Venus related sites here (541 entries "googling" with "shattersnet") i was hoping someone could tell me where i could get (thread) the informations i'm searchin' for.

Well, while i was rummaging through the jungle of venus related topics here at shatters...(it's really very, very much stuff to read...) I slowly began to understand... In this forum e v e r y t h i n g about Venus is anything else but funny...

But I didn't want to annoy anybody. That was definetely not what i intended. I do not like vulgary manners; neither verbal nor didactically. I'm just trying to make a good job...

Michael

[MiR]

My Celestia-Venus is wearing a brighter dress; based on the fictitious NASA/JPL Venus Cloud map texture.
Isn't she looking like a wonderful pearl now...?

I know, she isn't scientific but lovely

venus6401.jpg

Yes, yes, yes; to all those who'll tell me now "Celestia have to be scientific" I'm answering: You're absolutely right; above all Celestia must be scientific!
Therefore I'm using this Venus Cloud map only as an "AltSurface" option

Michael

[loki]

The fun about Celestia (for me anyway ) is the fact that you can "pimp" your universe anyway you like after all your the one that has to look at it

[John Van Vliet]

--- edit ---

[t00fri]

now there was a post ( umsf) about a conference about a month ago that the ground coloring was discussed
-- the only info is that it was discussed -- no other information .

This forum also has accumulated lots of relevant information about this matter. Hence it's well worth to search it for subjects that have been covered quite a number of times already. I have addressed the issue about surface colors of Venus several times here during the last 8.5 years. Here is a reminder from my last respective post almost 4 years ago. I think it still uses the best available imaging so far:

---------- viewtopic.php?f=10&t=10611&p=83143&hilit=venus#p83143 ----------
.
This official image from the Venus surface after the Russian Venera 13 landing originates from: USSR Academy of Sciences/Brown University, cf. http://www.nasm.si.edu/ceps/etp/venus/global.html



This image shows the combined effect of diffuse sky color AND surface color. However, since the sky color was measured independently, it could be subtracted leading to this rocky-gray surface (basalt) with atmosphere effects subtracted



Note: the color-gauging bar and the very natural colors associated
with visible parts of the spacecraft and the color bar!!
-----------------------------------------------------------------------------------------------------------------

Fridger

[MiR]

The fun about Celestia (for me anyway ) is the fact that you can "pimp" your universe anyway you like after all your the one that has to look at it

in principle: yes. But I need "some ground" under my feet; a green space, dotted with orange flowers and filled with octahedron-like planets... indeed, I would be a bit confused
But I just might imagine the particular fascination to "adorn" space with your favourite SF-fleet, planets, stars or something...
and: you are mentally active and - gradually - you'll learn something about cosmic relations (and more...)

my thoughts on this do differ from others but as long as a map is consistent with what we know and is not way to farfetched then use it

I also think so. It's like a "lok" texture map; or better: a "best-possible-knowledge" texture map

This forum also has accumulated lots of relevant information about this matter. Hence it's well worth to search it for subjects that have been covered quite a number of times already. I have addressed the issue about surface colors of Venus several times here during the last 8.5 years. Here is a reminder from my last respective post almost 4 years ago. I think it still uses the best available imaging so far:

re-answering always the same ol' questions is boring you..., that's understandable.These images (Venera) are well-known, of course. (but at first I had to learn that there are no - or scarcely - other pictures exists ) Therefore I think John's VT of the planet Venus ist currently the best solution...

I'm sorry... I was - naivly - thinking there are newer informations, or better certain insights available...

Michael

[John Van Vliet]

--- edit ---

[MiR]

Thanks John,

but there is some work being done on the old data . Just look at the "new" processing of the Voyager Jupiter data
Bjorn Jonsson's post
http://www.unmannedspaceflight.com/inde ... =0&start=0
the same is being looked at for Venus
just look at Phil Stooke's post - remapped venera
http://www.unmannedspaceflight.com/inde ... t&p=165043

it seems to me more and more that the pages of "unmannedspaceflight" are a good source (and discussion board) for the newest informations related to our solar system...

Venus cloud map is a work still in progress. I'm also planning to change the atmospheric parameters (a bit).

Therefore I have to take a deeper look at the Mie scattering values. (Will try it out on a smaller addon; probably Mars... because the atmosphere of mars is much better known than venus'...)

The best site I've found (and for a layperson comprehensibly) is a discussion thread at CelestialMatters:
http://forum.celestialmatters.org/viewtopic.php?t=116&start=0

And here I discovered a site where the Mie parameters can be calculate... But... I should say; I understand not much more than a stranger in bohemian villages (a german proverb = understand absolutely nothing)...
http://www.unternehmen.com/Bernhard-Michel/MieCalc/eindex.html (english version)

there are many other sites... But notably I do not know how the values can be translate into .lua or rather .ssc parameters...?

Anyway; I will try it out...

But of course I'll give the user an option to choose between my and the Celestia-Venus atmosphere.

Regards
Michael

[MiR]

once again: The Celestia user will have the choice to choose between two .ssc files;

One file will only change the cloud map of Venus.

The other one makes these changes:
-> atmospheric colors (including a blue haze around the planet)
-> transparency layer (only necessary if you are using a grey scaled map, e.g. John Van Vliet's Venus VT)
-> Venus cloud map

Example images;
both with John Van Vliet's Venus texture (Thanks a lot John, very good work )

currentVenus.jpg

newVenus.jpg

Regards
Michael

[John Van Vliet]

--- edit ---

[MiR]

mine is not "gray scale" it has a slight sepia tone

Yes, of course... it's the right tint for basalt and lava.

With the transparency layer I try to simulate the atmospheric shine on the pseudo-gray (sepia) Venus ground.

[MiR]

For a better comprehension...

overcloud.jpg

More informations here: http://www.planetary.brown.edu/pdfs/2875.pdf

(Thanks ANDREA for your helpful cooperation! )

Regards
Michael

[MiR]

I'm still laboring at the Mie parameters. The map - mainly based on Bj?rn J?nsson's Venus renderings (http://www.mmedia.is/bjj/index.html) - should be ready...

venusclouds_026.jpg

venusclouds_028.jpg

Criticism and suggestions are always welcome.

Michael

[MiR]

for completeness... here is the brighter version from the Nasa Venus cloud map.

venus_4.jpg

Both variants are also fictitious like the original renderings.

Michael

[Fenerit]

Where is the fictitiousness?

[MiR]

Venus with a blue haze in Open GL 2.

Venus0005.jpg

Looks good, maybe - but - is this real and authentic...?

Regards
Michael

[MiR]

Supplementarily I like to add:

My colour adjustments are mainly based on Ricardo Nunes' work.
http://www.astrosurf.com/nunes/explor/explor_vex.htm
Who deals very seriously with this issue at "Unmanned Spaceflight" (please look at the link of the very first post of this thread)

So, I hope my Venus renderings are not too exaggerate...

Michael

[MiR]

Merry Christmas for all!

Venus00037.jpg

Michael

[CAP-Team]

Compared to MESSENGER's images this looks very realistic to me.