My take on this awesome shot of Ingenuity in front of two distant dust devils, and in animation.
https://flic.kr/p/2kY3JUi
A very beautiful dust devil was recorded by Mastcam-Z Right in the sequence of the 5th flight of Ingenuity.
Substracting MCZ frames by a frame without the dust devil makes it more visible.
https://flic.kr/p/2kYBCYs
Another day, another devil in dust alley:
a little late with this ... I just saw Andreas post this as well - post #54
Here is a gif of the best frame of the dust devil on Sol 84
Dust devil alert! (yes, another one). Sol 92, just about due west, right side of this image (NLF_0092_0675115622_792EBY_N0040136NCAM00698_00_0LLJ01_800).
Phil
Sol 92 LMastcam-Z, with a dust devil in the upper left corner:
Since this place looks like Dust Devil Alley... I wrote a little workflow program to look for them in the NAV sequences
This is SOL 84 ... (we've seen this --- eyes left) ... the gain is cranked in the program
The nice dust devil of sol 92 captured by MCZ-Right, contrast enhanced:
https://flic.kr/p/2m1PbV5
And an animation:
Another set of images captured by Hazcam and Navcam of one or possibly two dust devils, a good two minutes apart, on sol 102, in the favored spot, in front of the darker crater wall:
Here is a GIF of 21 images (NAVCAM LEFT) for 5 minutes around local noon on Sol 101
It is from a program that looks for dust devils
Short Story: there are none close by (but there is something going on on top of the deltas in the center)
With the gain turned all the way up -- I suspect I am seeing compression artifacts, exposure differences, sensor sensitivities
Sol 100 Dust Devil Program
21 image GIF - NAVCAM-LEFT - 5min starting at 2:15 pm local
(1) left of center on top of a delta
(2) right of center in front of the deltas (speedy)
A more stationary dust swirl on the center of the delta, on sol 107:
Sol 107 Dust Devil Watch
Finer details still elude the detector so far ... but that delta is far away!
5 minute GIF starting 1:15pm local time
Scintillating bits are compression/stretching (?) or real (?)
Sol 111 -- Dust Devil Watch
Probable: One very far DD -- far left on the top of the crater rim - persists over several frames
Otherwise not much else
Gain all the way up - and then some - (very scintillating!)
GIF
Sol 114: a big dust devil was passing close to the rover
Hey, all. At the suggestion of long-time member PDP8E this thread has been created for everybody to post their images and animations of dust devils observed by Perseverance. Please be sure to include the sols when taken and times as well if they're available to make this data (and your great work) as useful as possible for any researchers who may take an interest. Thanks!
EDIT: I'll be moving several posts from the Perseverance threads over here to kick it off.
SOL 35 -- 1:20PM local
3 frame segment of a 360 degree quick peek (no DDs in the other frames)
Facing SW, the landing site is in the center, Kodiak is to the right.
A larger field of view including Kodiak hill showing the dust devil mentioned by Olivier:
https://flic.kr/p/2m6j2x6
Contrast increased:
https://flic.kr/p/2m6j5Pr
And another dust devil, again on sol 114:
https://flic.kr/p/2m6semx
SOL 117
WOW -- No fancy detector required!
It is more of a GUST than a DD...
Two dust devils on sol 120 in a difference image.
The right one (black here because negative) was photographed at 13:40:26 local mean solar time,
the left one (white because positive) at 13:49:45. Its continuation into the sky is faintly visible.
Hmm, time to start naming the dust devils after the members of the band Kansas, perhaps after cities in Kansas, and crowd-sourcing a competition to see which Kansas grade school can count the most?
Dust In The Wind.
https://youtu.be/tH2w6Oxx0kQ
SOL 121 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances)
GIF
SOL 123 Dust Devil Watch
21 Frames -- stationary stance -- 1PM local -- 14 secs between images -- 4 minute span
GIF
SOL 127 Dust Devil Watch (not 128)
360 degree quick peek (3 frames each in 5 stances) -- 3:20 PM local
GIF
SOL 128 Dust Devil Watch
21 Frames -- stationary stance -- 11 AM local -- all quiet (only compression and sensor noise)
GIF
(I posted this initially to the EDL thread but can't seem to find it now, so here it is for posterity)
Perseverance recorded this DD during descent. Simeon Schmauss spotted this in LCAM footage and produced this stabilized and reprojected view, shown here at 20x real time. The DD is seen moving westward at roughly 8.5 m/s (20 mph) and was estimated to be about 25 m (75 ft) wide.
https://twitter.com/stim3on/status/1379575241970683908?s=20
Hi Ryan,
Thanks for those DD maps!
And a personal thank you for the RoverPics website over on github. Great Job!
Karle
SOL 132 - Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 2:30 PM local
Improved noise reduction
Only one DD found - pretty quiet
GIF
SOL 134 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 8:45 AM local (early...)
Improved noise reduction
All quiet ... The mid-morning sun angle and lighting is interesting
GIF
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
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
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
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/pub/ods/surface/sol/00129/ids/edr/browse/ncam/NLF_0129_0678403356_559ECM_N0042222NCAM03129_04_195J01_800.jpg
Phil
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
SOL 144 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 10:30 AM local
All Quiet
GIF
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
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
SOL 147 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) --3:45 PM local
Quiet -- NO DDs -- Abbreviated GIF
SOL 148 Dust Devil Watch
21 Frames -- stationary stance -- Noon local
VERY ACTIVE -- EIGHT DDs
GIF
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.
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
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.
That is an excellent presentation of the complex events on that sol. Thanks for posting it!
Phil
Tau, awesome work! (I hear you on the size issue!)
Some very faint dust devils are even better visible in the difference images.
The images are converted to gray scale to remove amplified color noise.
From 0 min 43 sec to 1 min 26 sec I can count seven dust devils active at the same time.
Another view of the SOL 148 Event
Annotated -- 9 dust devils and a few gusts.
The event is 5 minutes long and we have 21 seconds of images.
SOL 151 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) --1:45 PM local
Several DD's
This is amazing. Anybody want to build a wind farm on mars? Poor insight lander.
SOL 153 Dust Devil Watch
21 Frames - single stance -- 11:55 AM local
One interesting DD -- it starts late -- wait for it! (center)
Another on the far left
SOL 154 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:30 PM local
DD's in the 4th and 5th sets
SOL 153 -- NAV - 2:51 PM local
There is a right-left pair if someone wants to try an anaglyph
SOL 156 Dust Devil Watch
21 Frames - single stance -- 12:15 PM local
Two DDs on the left will blow out-- BUT at the end, a crisp DD strolls in on the far right
SOL 157 -- NAVR - 2:30 PM local
There is part of a right-left NAV pair
SOL 151 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 3:20 PM local
Only two stances with DD and gusts
GIF
I finished up some improvements on the DD detector (C++) and tried it out on the SOL 148 Event.
Since this sequence was taken at High Noon at Jezero, there are no long shadows from the actual 'wispy' DDs.
So, I think the dark triangular 'mat' at the beginning is low flying dust flung from the passing DD. As the dust settles it takes on the color of the ground.
Light colors are more positive image pixels than the Averaged Comparison Image (21 frames), darks are more negative pixels
The program is fully automatic: drop the images in the working directory, press the button, and a minute later its is all done.
I believe a lot more hand processing would suss out more detail and make it more photorealistic.
I included the actual vs processed images as a comparison -- a little extra compression made it all fit into the upload limit.
GIF
SOL 166 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:30 PM local
Only one stance with DD
GIF
Stereo (parallel) view attempt for DD https://mars.nasa.gov/mars2020/multimedia/raw-images/NRF_0157_0680885377_854ECM_N0060000NCAM03157_01_195J
..no parallax for make benefit stereo so subsequent bribe of glorious 'turtle' to pose foreground!
Atomoid -A glorious turtle indeed!
SOL 169 - 21 image Dust Devil Watch -- 4:15 PM Local
NO DDs.
This is the single 'averaged' image:
SOL 170 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 3:45 PM local
No DDs but the terrain is interesting
GIF
SOL 172 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 5:05 PM local
No DDs -- late in the day... nice lighting
GIF
SOL 173 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:30 PM local
Distant Gust in Stance 3
Very close Gust in Stance 5
GIF
SOL 174 - "30" image Dust Devil Watch -- 11:15 to 11:40 AM Local
ACTIVE
There is a 30 frame sub-frame sequence
and a 15 frame full-frame sequence
30 frame:
Yet another DD watch on Sol 174
SOL 174 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) --11:45 AM local
Gust in Stance 5
GIF
Re-processed SOL 173 DD
Increased the sensitivity for dark matter.
3 stances ...
* the first stance shows a distant event with dust flying
* the middle stance shows an increase of dust right before the NAV camera head swivels to the next stance
* The final sequence picks up the action -- gust? or DD off-camera??
GIF
SOL 175 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:50 PM local
No DD
SOL 176 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:20 PM local
No DD - odd angle
Sol 178: dust devils spotted at the left of NavCam images
https://mars.nasa.gov/mars2020-raw-images/pub/ods/surface/sol/00178/ids/edr/browse/ncam/NRF_0178_0682754853_667ECM_N0062666NCAM02178_01_195J01.png
https://mars.nasa.gov/mars2020-raw-images/pub/ods/surface/sol/00178/ids/edr/browse/ncam/NLF_0178_0682754853_667ECM_N0062666NCAM02178_01_195J01.png
SOL 178 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:05 PM local
No DD - as we trundle down the service road between the ridge and the dunes ...
SOL 179 - 21 images (4 seconds apart) not sure why...
No DD ... looking at the ridge...
SOL 178 - 3:54 PM Local
rechecking images
there is a second fainter DD to the left of the 'visible' one that VikingMars pointed out... (and clouds too)
GIF
It's a two-for-one day!
DD Watch on SOL 181
360 degree quick peek (3 frames each in 5 stances) -- one in the morning and one at noon
Three DDs in Stance 5 (on the noon watch)
NOON is TOP
MORNING is BOTTOM
SOL 182 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:09 PM local
* Probable Distant DD in Stance 2 (a quarter of the way in from the left, against a distant hill)
* DD in Stance 5 to the left also
SOL 183 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:25 PM local
* Stance 1 -- Distant DD on the far right -- to the left of the horizon hills
* Stance 2 -- Distant DDs on the left -- picking up the DD action from Stance 1
* Stance 4 -- Distant DD in the hills
SOL 184 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:00 PM local
Stance 1 -- minor but real wind disturbance -- far-left
Stance 3 -- small DDs -- far-left and far-right
Stance 4 -- well-formed DD
SOL 188 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 2:35 PM local
All Quiet -- detector gain noise
SOL 189 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) --4:45 PM local
All Quiet -- Stance 5 has an exposure timing diff due to facing the late afternoon Sun
SOL 191 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) --4:40 PM local
All Quiet
SOL 193 (A) - Dust Devil Watch
21 Images - 1 Stance -3:05 PM
All Quiet
SOL 193 (b ) Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 3:10 PM local
Stance 4 has a DD climbing the crater rim
SOL 197 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 11:30 AM local
Stance 1 -- DD far left
Stance 2 -- Two distant DD's, center
Stance 5 -- DD far right
SOL 200 - Dust Devil Watch
21 Images -- 1 Stance -- 4:30 PM (late in the day)
All Quiet
SOL 202 - Dust Devil Watch
21 Images -- 1 Stance -- 3:20 PM
All Quiet
SOL 203 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 3:05 PM local
Stance 4 -- well-formed twister center-left
SOL 204 Dust Devil Watch
The Nav Cam caught this DD at 2:30 PM
(It is part of a Left/Right pair)
Quick FYI- new paper on Dust Devils...
Vortices and Dust Devils As Observed by the MEDA Instruments onboard Mars 2020 Perseverance Rover
https://arxiv.org/abs/2109.04601
SOL 208 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:40 PM local
Stance 3 -- DD far-right
Stance 4 -- The same DD, now far-left ... and another DD far-right
.... Dust Devil Watches
SOL 210 21 images - 1 stance 4:15 PM -- NO DD
SOL 211 21 images - 1 stance 7:23 AM -- NO DD
SOL 212 no images
SOL 213 no images
SOL 214 15 images - 3 images - 5 stances 7:45 AM -- NO DD
SOL 214 21 images - 1 stance 8:40 AM -- NO DD
... more SOLS later...
SOL 215 - Dust Devil Watch
21 Images -- 1 Stance -- 10:43 AM
A moving Dust Devil visible in all 21 frames
and a close-range GUST in front of the camera!
SOL 215 B -- the 2nd DD sequence of that SOL ... and a strange one
30 Frames -- 1 stance -- 27 minutes long! -- 10:56 AM to 11:23 AM
The timing between frames is roughly: 33 sec -- 84 sec -- 33 sec -- 84 secs -- etc.
Gusts and Dust Devils!
This is the large DD that Damia B. pointed out when she made that amazing panorama!
(contrast-enhanced)
Perseverance has been exposed to winds, gusts, and vortices for 200+ Sols
These 'containers' are associated with the mast stowage prior to landing ( i think ...)
Now they make excellent particle collectors... I hope to revisit them every few hundred Sols
GIF
SOL 236 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:45 PM local
DDs -- one in Stance 4 and another in 5
SOL 241 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 11:00 AM local
DDs -- in Stance 4 and in 5
SOL 242 - Dust Devil Watch
21 Images -- 1 Stance -- 1:00 PM
-- no DDs detected ---
SOL 249 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 11:00 AM local
Only showing stance 1 -- others are quiet
Stance 1 has a minor DD on the far left - GIF is wiggled back and forth...
SOL 250 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 11:50 AM local
Well-formed DD in Stance 4
SOL 252 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 11:30 AM local
Another DD in Stance 4
SOL 255 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:15 PM local
Only Stance 1 is shown -- a distant DD (or two) in the center
(the other Stances were very quiet) - a little wiggle back and forth too...
SOL 256 - Dust Devil Watch
21 Images -- 1 Stance -- 1:50 PM
A DD marches across in all 21 images -- then another walks in from the left
SOL 257 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 12:30 PM local
-- NO DDs
SOL 258 - Dust Devil Watch
21 Images -- 1 Stance -- 11:45 AM
A wide and whispy DD in all images (low dust load? not enough contrast?)
-- then another appears to the right of Kodiak
May be a change in the nature of the vortex. Remember that the atmosphere is changing with the approach of Summer. The dynamics of the cyclonic thermal updrafts is bound to change. Dust devils are a visible manifestation of thermals with dust entrained.
SOL 262 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:15 PM local
Stance 4 -- far off DD, center, climbing the crater rim
SOL 263 - Dust Devil Watch
21 Images -- 1 Stance -- 1:30 PM
DD -- right of center - Distant and moving
... a little catch-up...
Three posts coming... SOL 264, 265, 267
SOL 264 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 4:50 PM local ( very late in the day! )
Large DD in Stance 4 on the crater hill
SOL 265 - Dust Devil Watch
21 Images -- 1 Stance -- 12:55 PM
Dual DDs -- right of center - Distant and moving -- one fizzles
SOL 267- Dust Devil Watch
21 Images -- 1 Stance -- 11:25 AM
A nice DD on the march ( a comrade DD falters )
SOL 269 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 4:06 PM local
NO DDs -- all quiet -- late in the day --
SOL 271 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 1:10 PM local
Well-formed DD in Stance 4
SOL 274 Dust Devil Watch
21 Images -- 1 Stance -- 12:45 PM
DD Conveyor Belt -- one marches off to the right -- another in the center -- and one pops up on the left
SOL 278 Dust Devil Watch
21 Images -- 1 Stance -- 3:55 PM
Two DDs -- One is so easy to see -- can you see the other?
... a little catch up ...
SOL 279 Dust Devil Watch
21 Images -- 1 Stance -- 4:20 PM -- NO DDs
SOL 280 Nav Cam (part of a LR pair) 1:32 PM
GIF
SOL 280 Dust Devil Watch
360 degree quick peek (3 frames each in 5 stances) -- 2:38 PM local
DD in Stance 4 (center) and Stance 5 (right of Kodiac - faint)
SOL 283 - 15 images (3x5 quick peek) -- 3:15 PM -- NO DDs, but there were clouds over Kodiak.
SOL 284 - 45 images ! -- 1 Stance - JPL Broke my simple-minded Detector
12:06 PM to 12:27 PM (21 minute session)
** 15 images = 496 x 1296 pixels
** 30 images = 256 x 656 pixels
** Interleaved...
** (I'll see what I can do later...)
But there was another DD watch at 12:30 -- 15 images -- 3x5 quick peek
There is a DD in Stance 3
SOL 285 -- 21 images -- 1 Stance -- 11:42 AM
A DD seems to have come over the top of the Rover -- then we pick up the action.
4 DDs -- one on the crater wall --- the one that passed over the Rover -- a 'fire hose' DD off to the right
Near the end, a DD moves in from the left.
Storyboard (corrected version) for the dust devils on sol 285.
SOL 286 -- 21 images -- 1 Stance -- 12:05 PM -- No DDs
Tau - I love that storyboard!
Animated dust devils from sol 285.
The interaction of the dust devil with the dunes and ripples in the first frame is interesting (see also http://www.unmannedspaceflight.com/index.php?act=attach&type=post&id=49881).
SOL 287 -- DD Watch -- 15 Images -- 3 images in 5 Stances -- quick peek --- Noon
DDs in Stances 4 and 5:
Stance 4: minor DD in the center -- larger DD on right
Stance 5: pick up the progress of the larger DD from Stance 4
SOL 291 -- 21 images -- 1 Stance -- 1:10 PM
We have 3 things going on ... a DD coming in from the left -- a gust passing the Rover -- and Clouds!
NO DDs detected: SOL 292, 293, 294, 295, 296
SOL 297 -- 21 images -- 1 stance -- 1:00PM
A well-formed and slow-moving DD in all frames
NOTE: Slow-moving DDs play havoc with the standard technique of averaging or median-ing all the frames to arrive at a 'normal background image' to analyze each individual frame against -- it causes the dark 'shadow' near the DD. -- I am starting to investigate another technique.
SOL 298 -- 21 images -- 1 Stance -- 1:25 PM
A DD on the deltas
HAPPY SOL 300 -- 21 images -- 1 Stance -- 11:10 AM
only Frame #1 has a DD before it 'evaporates' (if that's the word)
It is centered and on the deltas (far)
Here is the single frame:
SOL 300 DD Bonus
NAV Cam 11:45 AM
SOL 301 -- 15 images -- 5 stances -- 1:40 PM
DD in stance 5
Here is just that sequence
SOL 302 -- 21 images -- 1 Stance -- Noon
Distant DD, center, wait for it...
A "storyboard" an an animation of a dust devil on sol 308 during a Mastcam-Z multispectral photo series.
The Mastcam-Z filter number and the time in seconds after start of the series are annotated in the storyboard.
The difference-to-average method does not work here because of the spectral filters, therefore contrast enhancement was used.
The dust devil on sol 308 continues into the infrared region of the spectrum with Mastcam-Z right eye filters 1 to 5.
The Mastcam-Z filter number and the time in seconds after start of the series in the previous post are annotated.
Contrast enhancement did not work here. Instead the difference-to-average method with manual adjustments to each image was used.
Overexposed and/or clipped highlights (https://mars.nasa.gov/mars2020-raw-images/pub/ods/surface/sol/00308/ids/edr/browse/zcam/ZR1_0308_0694277926_943EBY_N0090000ZCAM03282_0340LMJ01.png to the first raw image) in the bright landscape around the dust devil resulted in featureless patches of medium gray, which are masked here with red color.
A second dust devil appears in this series.
Starting with filter ZR5, the dust devils merge with the bright infrared background.
Mastcam-Z images, an orthorectified HiRISE image, and a HiRISE digital terrain model were used to determine the route of the sol 308 dust devil on the ground.
Twenty control points of corresponding features were set in the Mastcam Z image and the HiRISE image.
With some measurements and calculations, pixel coordinates in the Mastcam-Z image could be transformed into map coordinates of the HiRISE image.
The length of the visible part of the dust devil's route is about 820 m.
The average horizontal ground speed was about 30 km/h, and even 36 km/h on average between second 0 and 57.
To verify the calculations, it would be interesting to see if the dust devil left a visible track.
Was the horizontal ground speed actually m/s not km/s?
8.2 m/s, 30 km/hr.
Control points are necessary to tie a photo taken by the rover to an orthorectified orbital photo.
Here are my 20 control points. Some small features are hidden by the crosses.
In this case, it was of great advantage that the dust devil passed a smooth slope with an incline towards the rover.
Sol 372 DD watch
21 images - 11:40 AM
Be well!!
Looking forward to the Backlog.
--Bill
Sol 756 Navcam images of a dust devil ("storyboard" and animation).
The time interval between successive images was about 5 seconds.
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