Spirit retrospective, - a few details from my current project |
Spirit retrospective, - a few details from my current project |
Jan 20 2012, 09:13 PM
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
I'm working on Spirit at the moment. I will post a few examples of things as I go.
Right now the important job is updating the contemporary route map by locating the stops on HiRISE images. The existing maps at JPL, for the early part of the mission, were plotted on MOC images with inferior resolution and lighting, so I find many locations were about 15 or 20 m out. So at every site I am making circular panoramas (examples later) for comparison with HiRISE. Here's a first example, a map of the route during the Primary Mission. I have added a few extra placenames from the MER Analyst's Notebook at PDS. 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 PDF: 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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Jul 9 2012, 10:55 PM
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
We also got Andromeda--it was barely detectable in the largest practical exposures. I believe it was A/1941, night time opacity field A (aka the "diffuse sensitivity test"). (I hope Phil doesn't mind me using his thread to do some Spirit retrospection - this definitely doesn't belong in the Oppy thread where those quotes come from.) Thanks for digging that up, Deimos. "Barely detectable" is a good description! With some effort I was able to squeeze the Andromeda Galaxy/M31 out of the 1941 pics. If anyone wants to try this at home, here are the details: I used these two frames: 2P298641880EFFB1E5P2731L1M1.JPG (frame 1) 2P298642075EFFB1E5P2731L1M1.JPG (frame 2) I added 256 to the frame 2 values, then subtracted frame 1. The result was stretched and smoothed. (Strangely, the PDS RAD images show less detail than the jpl jpegs.) The result is that most of the frame averages to neutral grey. Any real object (eg a star) will appear as a lighter-than-neutral-grey streak adjacent to a darker streak, which stands out very well. I've identified M31 in this crop: It's clearly fuzzier than the stars, and it is exactly where it should be, as you can see from this flicker gif comparing the difference image with a star chart: Extragalactic imaging from Mars! |
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