MARCI Images, ISIS pointers/advice/help much appreciated and desired! |
MARCI Images, ISIS pointers/advice/help much appreciated and desired! |
Aug 18 2010, 07:51 PM
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#1
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Member Group: Members Posts: 293 Joined: 29-August 06 From: Columbia, MD Member No.: 1083 |
As part of my research, I'm starting to learn ISIS and display MARCI imagery. I've quickly learned that MARCI imagery is pretty hard to work with since it's a push-frame camera, which a few people claim is the reason there's a relative lack of papers published using its data. I tried to run through the process for an entire pole-to-pole MARCI swath and after processing cam2map for nearly 48hrs, the Linux box booted me off. That's on 8GB of RAM, BTW. After that, I started cropping the images to much smaller chunks. Below is my first recognizably Martian image that I've been able to produce (I've only been at this for a few days). This is from the southern mid-latitude highlands. Some things I don't understand...why is the left part of the frame somewhat washed out/bright? The red/yellow bands around the edge are areas where there apparently is no data in the green or blue channels...not sure why. My processing steps are:
marci2isis spiceinit marcical crop cam2map automos I need to figure out how to really speed this up. I want to look at complete MARCI global mosaics over at least 1 martian year if not the entire MRO mission. At this rate, that would take years . Apparently an ISIS update is coming out in the near future which will help work with LROC WAC images. LROC WAC is also pushframe, so maybe that will help with MARCI imagery as well? Thanks in advance! |
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Aug 20 2010, 08:42 PM
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#2
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
It seems the blue channel really brightens to both east and west edges of the mosaic -- is that a photometric effect? MARCI does see a wide longitude strip, and I know photometric effects are what have made it take so long to create the LRO WAC mosaic, but I would have expected it only to brighten on one edge (west), not both. Is it atmospheric scattering?
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Aug 20 2010, 09:00 PM
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#3
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Member Group: Members Posts: 293 Joined: 29-August 06 From: Columbia, MD Member No.: 1083 |
It seems the blue channel really brightens to both east and west edges of the mosaic -- is that a photometric effect? MARCI does see a wide longitude strip, and I know photometric effects are what have made it take so long to create the LRO WAC mosaic, but I would have expected it only to brighten on one edge (west), not both. Is it atmospheric scattering? Emily...I've been trying to figure that out. Cartrite on the ISIS Support forum notices the same effect, but it never really gets answered by the ISIS staff. I cropped the sides off the image off, and that helps. When I keep the full image width, there's just bright blurs on each side. I suspect it might be an atmospheric effect, but I don't know enough about imagery and the cameras to make an educated guess. |
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