Juno PDS data |
Juno PDS data |
Jan 8 2016, 10:15 PM
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
There is now PDS-format JunoCam cruise and Earth flyby data available; it's been submitted to the PDS, but MSSS has gone ahead and posted it on their website. I've created an index page to it here. Unlike my usual index pages, there aren't any thumbnails because of the odd nature of JunoCam images, with their long skinny shapes and interleaved framelets. I haven't played much with these data because it's a bit beyond my skill -- I look forward to seeing what any of you can do with it.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Feb 26 2018, 08:22 AM
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#2
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Member Group: Members Posts: 411 Joined: 18-September 17 Member No.: 8250 |
Mike, Gerald - Thanks for the replies.
Rotation and tilt relative to the spin axis are two of the extrinsic parameters produced from my camera modeling process, and end up being adjustable parameters to my image formation pipeline. So, I was curious how much the spin axis has changed between the imagery used for camera modeling (2016026, 2016040, 2016130) and and Perijove imagery. Changing the rotation by 0.1 degree definitely has a noticeable effect on the assembled imagery. Gerald - in addition to your misalignments candidates, one I’ve wondered about is the effect of onboard compression on imagery with high gradients. such as point sources (which I use to produce the camera model) and Jupiters limb (which I use to judge the alignment). I also think there is a non-radially-symetric component to misalignment. I’m currently capturing that in p1,p2 parameters of my brown model. |
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Feb 26 2018, 03:37 PM
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Senior Member Group: Members Posts: 2517 Joined: 13-September 05 Member No.: 497 |
So, I was curious how much the spin axis has changed The spacecraft sends down its orientation as determined by the star trackers at fairly high resolution and these data are assembled into the C kernels, so it's not like this is some big mystery if you are using SPICE. QUOTE I’ve wondered about is the effect of onboard compression... Certainly there is a small effect, especially for the high compression factors we were using for star imaging in cruise. But I wouldn't say it's any more significant than other sources of error, like motion blur from spacecraft nutation. We didn't even bother to compute centroids for our analysis, we just used the eyeball location of stars. As I've said before, expecting subpixel registration without any manual adjustment steps is probably not achievable. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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