t00fri wrote:Every active participant in this thread knows about the tricky interpretation of radar images and their crucial differences wrto visual light imaging. So we don't need your wisdom here.
Apparently you do need it. The link you pointed to has no bearing whatsoever on Andrea's texture that you so gleefully and explicitly approved of, because all Andrea has done is
manipulated the colour of a radar image to match that of a true colour image.
You apparently do not understand that his texture is basically a greyscaled radar image, and as such that colour (ie greyscale brightness) on this texture is not remotely related to its true colour in visual light. Therefore it is not "perfect" at all, unless used as an indicator for radar reflectivity... which was not the point of this argument at all - the point was to get a texture of Venus that is realistic in
visible light, and this texture does not do that at all. It isn't even close, in fact. The terrain in Aphrodite Terra is
not white in visible light as shown in the texture - it's just radar-bright. It can still be dull grey in visible colour and yet be radar bright (ie white in the texture) because of surface roughness (or a sheen of reflective metallic frost if at high altitudes).
So I really don't know how you have the gall to argue with me and put me down for five pages about how little I know and how "unscientific" I am, when you then cheerfully go on to explicitly accept and approve of a texture that is quite obviously NOT realistic in real colour at all. You've amply demonstrated your ignorance of the subject here.
Again, Fridger - you are wrong. You are not and have never been qualified in the field of planetary science and you have had no experience working with Venus SAR images, so your "authoritative opinion" on this subject matter is completely baseless.
I expect a retraction and an apology from you, Fridger. Though you undoubtedly have demonstrated time and again that you lack the sense of personal honour and humility to be capable of admitting that you are wrong about anything...
It is on the basis of this image that one may conclude with some admitted amount of boldness that after subtraction of the orange diffuse sky illumination, the ground color is rocky gray.
We already knew that it was "rocky gray"!. I pointed that out much earlier on in the thread, while you were busy throwing insults at and deriding the excellent work that Don Mitchell did. Basaltic material on Venus is going to be the same colour as basalts on earth and on Mercury and anywhere else in the universe - you don't need a picture to prove that to be the case.
I had said that the ground colour of Venus is going to be grey/black because it was made mostly of basaltic material because of geochemical analyses done by the landers - this has been known for decades. I said this because I actually know something about this subject, having done a geology degree and having worked on Venus during my PhD. Your "triumphant proclamation" that Venus' surface colour is 'rocky gray' is just reiterating what I said earlier, and really proved nothing new at all. But apparently you were just interested in was putting me down and making out that you were the only person in this community who could make authoritative statements about Venus or any aspect of science at all.
