Dust Devils In Jezero Crater, single-point repository of imagery |
Dust Devils In Jezero Crater, single-point repository of imagery |
Jul 10 2021, 07:01 PM
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#31
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
SOL 137 Dust Devil Watch
21 Frames -- stationary stance -- 5:00 PM local A new version of the detector - noise reduction / refined structure A nice DD in the distance ----<oops see post #33>---- GIF -------------------- CLA CLL
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Jul 13 2021, 11:12 PM
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#32
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
SOL 140 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 2:30 PM local Nice DD in the SW stance (4th set) GIF -------------------- CLA CLL
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Jul 14 2021, 02:09 AM
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#33
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
on SOL 137 my dust devil detector was TRICKED!
I was checking the location of the SOL 137 'dust devil' and it wasn't there! The sequence of 21 images was 5 minutes and 23 seconds starting at 17:05:27 PM (late in the day... long shadows) Here is the first and last image in a GIF The detector dilates the area around initial image differences and made it larger.... < see post #31> -------------------- CLA CLL
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Jul 14 2021, 03:22 AM
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#34
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
I don't think this one was mentioned before: on sol 129 the Navcams caught a DD against the crater wall to the SW:
https://mars.nasa.gov/mars2020-raw-images/p..._195J01_800.jpg Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jul 15 2021, 09:45 PM
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#35
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
SOL 142 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 3:45 PM local Looks like the same place as SOL 140 Very Quiet (I turned down the denoise knob just to see if it is that quiet... it is) GIF -------------------- CLA CLL
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Jul 17 2021, 04:10 PM
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#36
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
SOL 144 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 10:30 AM local All Quiet GIF -------------------- CLA CLL
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Jul 18 2021, 04:29 PM
Post
#37
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
SOL 145 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 4:30 PM local All Quiet -- Late in the day. -- NO DDs abbreviated GIF -------------------- CLA CLL
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Jul 19 2021, 10:17 PM
Post
#38
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
SOL 146 Dust Devil Watch
21 Frames -- stationary stance -- 3:00 PM local ACTIVE -- a brief surface dust-gust in the center -- a strong gust on the right that blows into a type of dd? GIF -------------------- CLA CLL
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Jul 21 2021, 10:23 PM
Post
#39
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
SOL 147 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) --3:45 PM local Quiet -- NO DDs -- Abbreviated GIF -------------------- CLA CLL
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Jul 21 2021, 10:26 PM
Post
#40
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
SOL 148 Dust Devil Watch
21 Frames -- stationary stance -- Noon local VERY ACTIVE -- EIGHT DDs GIF ... I hope Ingenuity survived... -------------------- CLA CLL
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Jul 22 2021, 10:25 PM
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#41
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
REVISED SOL 148
I revved the program to move it into HSV color space (RGB is not intuitive for saturation and luminance) The dust devils are now the correct Hue (with the brightness turned up just 33%) It also kills the annoying scintillation from the noise and compression artifacts. -------------------- CLA CLL
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Jul 23 2021, 02:46 AM
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#42
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
Detecting Dust Devils with multiple images is fairly straightforward: average all the frames, and compare each image to the average -- use subtract, ratio, and other techniques.
Detecting faint DDs in one image requires a different approach: increase the contrast while retaining the image quality-- somehow. This is a test image from SOL 15 (!). The technique is Stochastic Equalization / Adaptive Contrast (SEAC) The image has a pronounced screendoor effect from the Bayer (in the sky) and has an overall 'old-timey postcard quality', but the DD is visible and the contrast is increased Another image 30 minutes before had no artifact at this position. --GIF -------------------- CLA CLL
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Jul 23 2021, 04:46 PM
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#43
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Member Group: Members Posts: 790 Joined: 9-May 21 From: Germany Member No.: 9017 |
A storyboard for the dust devils from sol 148 (because the animated gif is too big for upload).
The difference between each image and the median of all 21 images is enlarged and then added to the median. Since compression artifacts give large color blobs in the sky, I desaturated the sky. The time markers start with the first image which was aquired at the local mean solar time of 12:01:50. The large dust devil to the right of center in the first images seems to be quite close, because it casts a large shadow on the dune field in the foreground. Later, the swirling dust around the brighter central column darkens the sky a bit. |
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Jul 23 2021, 07:20 PM
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#44
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
That is an excellent presentation of the complex events on that sol. Thanks for posting it!
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jul 23 2021, 09:19 PM
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#45
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
Tau, awesome work! (I hear you on the size issue!)
-------------------- CLA CLL
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