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New Horizons: Near Encounter Phase
HughFromAlice
post Jul 28 2015, 10:05 PM
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QUOTE (neo56 @ Jul 29 2015, 06:17 AM) *
LORRI mosaic


Nice work :-) I like your ideas about trying to be as accurate as possible. When I've stitched photos of scenes that I know on earth (Central Australia has some big panoramas!)
then it becomes really obvious how easy it is to majorly distort things!! ……Hᴜɢʜ…ツ
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scalbers
post Jul 28 2015, 10:59 PM
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QUOTE (Antdoghalo @ Jul 28 2015, 09:59 PM) *
Unfortunately I am unable to view images as large as 16K. Are you working on a map of Charon too?
The animation sounds like it will be awesome to see when it's done.

I posted an 8K version of the map now here. Perhaps Charon will be good for me to do when some additional frames come in over time.

So far I have just a few frames for the animation, I recall Bjorn had a good one earlier as well.


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Charles
post Jul 29 2015, 01:17 PM
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QUOTE (neo56 @ Jul 28 2015, 04:47 PM) *
Here is my take on the LORRI mosaic, rotated and very slightly sharpened. I colorized it with the 2x2 color picture of Pluto. Since this color low resolution picture and the B&W LORRI mosaic didn't overlap correctly with simple rotation, translation or shearing, I cut the color picture into 50 segments. Then I warped each segment to match the LORRI mosaic. It took me hours of work on Gimp but the result is worth it smile.gif



Beautiful!
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Habukaz
post Jul 29 2015, 06:20 PM
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I've semi-manually extracted the footprint of the 80 metres per pixel mosaic (P_MVIC_LORRI_CA) aka the highest-resolution image series of Pluto (AFAIK) from the NASA's Eyes application:

Attached Image


The zig-zag pattern is an artefact of my crude plotting and introduced to reset accumulating inaccuracy; presumably related to Pluto's changing appearance as seen from New Horizons due to the craft's high velocity.

How accurate the NASA's Eyes application is supposed to be, I have no idea (to some extent, I did this as a training exercise).


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djellison
post Jul 29 2015, 06:43 PM
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QUOTE (Habukaz @ Jul 29 2015, 11:20 AM) *
How accurate the NASA's Eyes application is supposed to be, I have no idea


It should actually be pretty good.
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stevelu
post Jul 29 2015, 07:17 PM
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QUOTE (Habukaz @ Jul 29 2015, 10:20 AM) *
the footprint of the 80 metres per pixel mosaic

Seems like a good time to reiterate a question I've had [ http://www.unmannedspaceflight.com/index.p...mp;#entry223108 ]

Basically, how illuminated are we expecting the hi-res pictures of Krun Macula to be (some graphics seem to show that part of Pluto's disk deep in shadow during closest approach), & how is this expected to impact resolution?
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nprev
post Jul 29 2015, 08:10 PM
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MOD NOTE: Moved 8 posts to start a new topic on Pluto System Cartography. smile.gif


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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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alan
post Jul 30 2015, 12:16 AM
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QUOTE (Habukaz @ Jul 29 2015, 01:20 PM) *
How accurate the NASA's Eyes application is supposed to be, I have no idea

It shows the 15 frame mosaic farther north than the images we have down. How much affect that difference would have the track of the images taken near close approach I have no idea.

Looking at it last weekend I noted three passes at higher resolution than what we have down, the highest resolution pass you've shown ~80 m per pixel, another at ~120 m per pixel following a somewhat similar track, and one at ~250 m per pixel that crosses some mid latitudes terrain with varying albedos and ended in the eastern edge of Cthulhu Regio.

There is also a set of 16 pairs of images in four columns which may be a 4x4 mosaic at 3x the resolution of the 2x2 mosaic.
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Habukaz
post Jul 30 2015, 09:49 AM
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By the way, I've realised that the LORRI pointing in Eyes that I used to project the rest of the path is not where I subconsciously thought it were, so the footprint is probably off 1-2 pixels most places in a south-westerly direction relative to the Eyes application (but relative to the real thing: who knows..).

QUOTE (stevelu @ Jul 29 2015, 09:17 PM) *
Seems like a good time to reiterate a question I've had [ http://www.unmannedspaceflight.com/index.p...mp;#entry223108 ]

Basically, how illuminated are we expecting the hi-res pictures of Krun Macula to be (some graphics seem to show that part of Pluto's disk deep in shadow during closest approach), & how is this expected to impact resolution?


You can check for yourself in NASA's Eyes with the preview option what things look like (if you haven't already). The sun was certainly setting on Krun, so it should only have gotten darker there since the stereo mosaic was taken. Given the uncertainty of where Pluto was, I would guess that they've used similar settings for all of the strip, but I haven't seen such details mentioned anywhere.


QUOTE (alan @ Jul 30 2015, 02:16 AM) *
It shows the 15 frame mosaic farther north than the images we have down. How much affect that difference would have the track of the images taken near close approach I have no idea.


It seemed very roughly correct, though, which is why I bothered to make that image at all (it also fits well with similar images posted here).

QUOTE
Looking at it last weekend I noted three passes at higher resolution than what we have down, the highest resolution pass you've shown ~80 m per pixel, another at ~120 m per pixel following a somewhat similar track, and one at ~250 m per pixel that crosses some mid latitudes terrain with varying albedos and ended in the eastern edge of Cthulhu Regio.


According to the list machi posted (#670), there is indeed one mosaic at 0.24 km/px and 0.12 km/px. I was also thinking about making a footprint image for those.

In Eyes, there is also this strange thing:

Attached Image


It's closer to closest approach, so should be able to give even higher resolution than 80 metres - but are any usable images actually taken? Today, I am unable to reproduce that result; now the LORRI FOV at that time is pointing into nightside terrain..


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neo56
post Jul 30 2015, 04:19 PM
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My version of Sputnik Planum with contrast increased to show the complexity of its surface.


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Ron Hobbs
post Jul 30 2015, 05:02 PM
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Absolutely stunning! Thank you!

Ron
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alan
post Jul 30 2015, 05:17 PM
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QUOTE (Habukaz @ Jul 30 2015, 04:49 AM) *
It seemed very roughly correct, though, which is why I bothered to make that image at all (it also fits well with similar images posted here).

Oh, its been updated since I looked at it this weekend. The Pluto map now has better resolution and the position of the 15 frame mosaic looks more accurate.
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djellison
post Jul 30 2015, 06:03 PM
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As a heads up - we are slowly getting reconstructed pointing data from the NH team and putting it into Eyes as and when we can.

Yesterday a new release went live with some of that data included.
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Ian R
post Jul 31 2015, 10:16 AM
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Are they downlinking selected strips of individual LORRI frames? The official Pluto photomosaic would seem to indicate this is the case:

http://photojournal.jpl.nasa.gov/catalog/PIA19858

Attached Image


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Nafnlaus
post Jul 31 2015, 10:59 AM
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Is there going to be a press conference today (and if so, what time)? If there is then maybe someone will ask about the high res strips.
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