MARCI Images, ISIS pointers/advice/help much appreciated and desired! Options

[mwolff]

Rememebr the FOV of MARCI is HUGE. The edges you're looking really out left and right from the spacecraft so whilst it's nicely map projects, you're looking through a lot more atmosphere, and I don't think that's something you can easily calibrate out and is probably what's causing the problem.

What one can do, and what was done for the MOC WA images to make the nice Daily Global Maps (DGM), is to create a "flatfield" using a large number of images coadded together, say for most of a month. This produces a nice function which can remove *uniform* dust loading (i.e., longitude independent) and the opposition surge. I haven't tried it myself to remove the opposition surge or atmospheric edge effects (I try to use these edge effects to study the atmosphere), but I believe it is being done internally at MSSS to produce DGMs for internal project use.

A similar effort was done using many months of images (actually more than a year of images) to provide an improvement to the ground-calibration flat fields. I read about this being applied to Clementine images, and it seemed to work well enough for the flat field improvements.

[Drkskywxlt]

Using a MARCI swath from a later orbit (6124), I made this image of Lunae Planum. The dark albedo terrain seems to be closer to "true color" in this image vice the ones I posted last week with the blue tinge. I didn't change anything, so perhaps the MARCI team just got better with the color matching as time went along?

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[Drkskywxlt]

I never posted some of the other (slightly more interesting) MARCI images I did manage to produce. I abandoned this awhile ago, but am hoping to team with someone who has been paid to process MARCI imagery for more research. Anyway, here's a few more:

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[Drkskywxlt]

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[mhoward]

Very nice. First one in that pair shows Tempe Terra and Kasei Valles; second image is just above the first one. They overlap nicely.

[Drkskywxlt]

Yes, I split a larger image into two pieces. Combined, they represent about 1/5th (if memory serves) of a single pole-to-pole swath of the 12 MARCI takes every day.

[jccwrt]

I've decided to take up working with MARCI images, given that it's a pretty sizeable dataset with a lot of goodies in it. I wanted to use it to render some overflight videos of the Martian surface, maybe one day with the goal of adding in some narration or running an ISS HDEV style stream showing the Martian surface passing underneath at real-time orbital speed. For now, here's an overflight of the North Pole / Nili Fossae / Tyrrhena Terra region on March 7, 2020 at appx. 10x real-time speed.

https://youtu.be/DcVRRpqdzeo