Exploring Gediz Vallis and its ridge, Sols 3871-xxxx, 1 Jul 2023- |
Exploring Gediz Vallis and its ridge, Sols 3871-xxxx, 1 Jul 2023- |
Jun 30 2023, 02:41 PM
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#501
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Solar System Cartographer Group: Members Posts: 10182 Joined: 5-April 05 From: Canada Member No.: 227 |
I think it's time for a new topic. We are effectively at the entrance to Gediz Vallis now that we have climbed this last slope on sol 3871.
The previous topic described the Greenheugh Pediment. We made a valiant attempt (two valiant attempts really) to explore its surface. It was too rough for Curiosity's dainty wheels but its outer edge was examined in detail. But now there are new targets: a crater cluster, the Gediz Vallis Ridge whose upper part is accessible from this level, and the large valley and its central sinuous valley as well. I attached a picture seen at LPSC - I am embarrassed to say that I can't remember where it was from. Usually I have detailed notes of sources but this one slipped through. Maybe someone will recognize it and I can add a source. It gives the name of the butte at the western entrance to the valley, annotated onto the JPL map. 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 PD: 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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Today, 12:42 AM
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#502
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Senior Member Group: Members Posts: 4250 Joined: 17-January 05 Member No.: 152 |
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Today, 07:13 PM
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#503
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Member Group: Members Posts: 811 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
The accuracy of the colours here isn't very certain, but I don't recall anything showing up this vivid a shade of green with these cameras before: I think part of the green tint is due to debayering artifacts. Here is what I obtain after removing them. Here is also the MC100 context mosaic of the workspace. -------------------- |
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Today, 08:30 PM
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#504
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Senior Member Group: Members Posts: 4250 Joined: 17-January 05 Member No.: 152 |
I think part of the green tint is due to debayering artifacts. Here is what I obtain after removing them. It's common to see green blocks when doing a simple deBayering. But they appear on smooth areas, where the jpeg compression algorithm is tricked into compressing too much. I don't recall green artifacts on irregular areas before. Also the green deBayering artifacts follow the 8x8 pixel DCT jpeg block pattern, which these greenish areas don't. How do you remove the green blocks - is it possible you've removed too much green? The overall colour balance may be off somewhat in my image. And there certainly might be something about the rock here that causes some new type of artifact - we may have to wait to see colour images from the original data to know for sure. |
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