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InSight Surface Operations, 26 Nov 2018-
fredk
post May 6 2019, 03:34 PM
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QUOTE (mcaplinger @ May 6 2019, 02:17 AM) *
I'm not sure what issue you're actually reacting to.

My original comment was about the recent press release cloud and sunrise/set animations, especially for the ICC. This is a frame from that animation, for which the caption reads "This color-corrected version more accurately shows the image as the human eye would see it":
Attached Image

It's hard to believe such saturated purples and cyans are accurate, given all the previous imaging of the sky, so my original comment was that perhaps they meant to say "false colour".

As Deimos suggested, maybe instead large errors were introduced in the matrix conversion to sRGB, since that matrix will have to amplify small differences between G and B channels due to their similar spectral responses.
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mcaplinger
post May 6 2019, 05:39 PM
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QUOTE (fredk @ May 6 2019, 07:34 AM) *
It's hard to believe such saturated purples and cyans are accurate...

Well, it is after sunset and the martian sky is bluish at sunset, and then someone may have put a strong log stretch on it to simulate the eye response? Who knows, these true color things are slippery.


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akuo
post May 7 2019, 03:48 AM
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QUOTE (PaulH51 @ May 6 2019, 03:29 PM) *
Interesting Mole Update 'DLR HP3 Blog' link

QUOTE
Depending on the outcome of the diagnostic hammering, our next operation could be using the arm to load the support structure close to the fore-right-foot (the one you see in the image above) or the ground right next to the support structure near the tether box.


I don't quite understand the operation plans above. Are they talking about moving the frame of the mole?


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PaulH51
post May 7 2019, 04:41 AM
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QUOTE (akuo @ May 7 2019, 11:48 AM) *
I don't quite understand the operation plans above. Are they talking about moving the frame of the mole?

They way I'm reading this - Is that they intend to apply load to the housing structure with the robotic arm (just above the foot pad you see in the image), I guess this is to prevent the housing moving during the test and thus compressing the regolith enough to either let the mole break through the duricrust and or increase the friction on the mole's hull so the whole mole enters the regolith.
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vikingmars
post May 7 2019, 06:28 AM
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QUOTE (fredk @ May 6 2019, 05:34 PM) *
It's hard to believe such saturated purples and cyans are accurate, given all the previous imaging of the sky, so my original comment was that perhaps they meant to say "false colour".
As Deimos suggested, maybe instead large errors were introduced in the matrix conversion to sRGB, since that matrix will have to amplify small differences between G and B channels due to their similar spectral responses.

Dear Fred, I must agree with your assumptions.
Here are some color-processed VL1 'sky-dynamics' pictures taken at sunrise (with fog) and at sunset.
The Martian sky has indeed a bluish halo, but near the Sun, and the rest is amber-colored (i.e. a desaturated salmon pink).
Enjoy smile.gif
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Attached Image
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stevesliva
post May 7 2019, 01:28 PM
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QUOTE (PaulH51 @ May 7 2019, 12:41 AM) *
They way I'm reading this - Is that they intend to apply load to the housing structure with the robotic arm (just above the foot pad you see in the image), I guess this is to prevent the housing moving during the test and thus compressing the regolith enough to either let the mole break through the duricrust and or increase the friction on the mole's hull so the whole mole enters the regolith.


Not without parsing things carefully, I read it the same way. They mention "applying load" at either of two places. The support structure, or the ground adjacent to the support structure. Holding the structure might give the mole more leverage. Pressing on the ground might make things more cohesive beneath the surface.

We're talking about the DLR blog
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mcaplinger
post May 7 2019, 06:58 PM
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QUOTE (fredk @ May 6 2019, 07:34 AM) *
It's hard to believe such saturated purples and cyans are accurate, given all the previous imaging of the sky, so my original comment was that perhaps they meant to say "false colour".

I sat down this morning with Justin Maki and looked at a bunch of color-corrected Insight images. Justin has, IMHO, done a spectacular job with this and most of the images are really nice. This particular one was obviously very dark and then it was simply linearly stretched on the clouds, which make them a lot more contrasty than they would really be. But the underlying blue tint is real.

I encourage everyone to look at the color-corrected versions when they get released to the PDS.


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fredk
post May 7 2019, 11:22 PM
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Thanks a lot for asking about this. For sure if a linear stretch includes a constant term (ie if the black point is shifted, so the darks are clipped) then you can get a boost in saturation. Conversely you can tone down the saturation in this image with another linear stretch (with black point shift). The upper right corner of the image does appear to be clipped.

The palette available in these 8-bit gifs can also do wonky things to colours.
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Hungry4info
post May 9 2019, 12:23 AM
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I think we're making progress...?
Compare
https://mars.nasa.gov/insight-raw-images/su...0000_0693M_.PNG
https://mars.nasa.gov/insight-raw-images/su...0000_0704M_.PNG

The whole HP3 assembly is moving again. (animated .gif attached)
Attached thumbnail(s)
Attached Image
 


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PaulH51
post May 9 2019, 02:18 AM
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QUOTE (Hungry4info @ May 9 2019, 08:23 AM) *
I think we're making progress...?
....The whole HP3 assembly is moving again. (animated .gif attached)

I think they were hoping to see some movement of the science tether in the housing window highlighted in this image, I've sampled the frames from sol 158 and can't see any movement of the tether with my ageing eyes sad.gif
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Hungry4info
post May 9 2019, 02:31 AM
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Here's a far better animation showing the movement of the HP3 shaft by landru79.

https://twitter.com/landru79/status/1126141561354498048


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serpens
post May 9 2019, 06:42 AM
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The footing seems to have remained stable compared to the significant movement observed in the last (Sol 92 - 3rd March) operation of the mole.
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Phil Stooke
post May 15 2019, 02:29 AM
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Off to the northwest from the landing site there is a hill. It was very faintly visible in early panoramas posted here, and I was just looking at it again in recent images. Here's a view of it accompanied by a version of the same image stretched vertically (Me-o-vision style) to make it easier to see the shape. It looks as if it has a lower extension to the right which I had not seen before. This may help identify it in HiRISE images (I had 2 candidates). This is a composite of two recent images.

Let me know if you spot any other small distant hills like this. There is a distant long ridge to the east which is easy to spot on orbital images.

Phil

Attached Image


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