Global True Color View Of Venus? |
Global True Color View Of Venus? |
Aug 8 2005, 06:53 PM
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
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? -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Oct 17 2010, 01:37 AM
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#2
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
I don't know how you could ever make a 'true color' map of the surface of Venus. We've only seen a very few small spots from the Venera probes--not enough to generalize about the entire planet--and there's no way to extract color from radar data. If that wasn't enough, lighting conditions, surface compositions, etc. undoubtedly do vary for a variety of reasons, so even if we could somehow obtain visible-light surface images of the entire surface that wouldn't necessarily correspond with what the human eye would actually see.
Even doing this for Mars is a formidable challenge; there's inevitably some degree of interpolation/assumption involved, as our resident imagemages will surely attest. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Oct 17 2010, 07:02 PM
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#3
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Junior Member Group: Members Posts: 74 Joined: 9-October 10 From: Victoria, BC Member No.: 5483 |
I don't know how you could ever make a 'true color' map of the surface of Venus. We've only seen a very few small spots from the Venera probes--not enough to generalize about the entire planet--and there's no way to extract color from radar data. Well, it'd definitely be "simulated true colour". I was thinking more "this is what the surface could look like, assuming basaltic composition". I know that bright (reflective) radar patches aren't necessarily bright in visible light, for example - they're just rough surface (unless they're on mountaintops IIRC, in which case they might actually be pyrite deposits?). Someone could take a small feature on Venus (e.g. a dome or crater) and translate the radar bright/dark into visible (using appropriate rules like "radar bright = rough surface, radar dark = smooth surface") that would be nice. I guess it's more a space art/visualisation thing than anything "scientific", but it'd be nice to be able to look at a view of Venus and say "that's what we might see if we looked at this feature in visible light". |
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