Rosetta Mars |
Rosetta Mars |
Jan 20 2012, 08:45 PM
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#1
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
It appears Rosetta stuff, including the Mars flyby Osiris data, has hit the PDS. I don't have time to look at it now, but I'm downloading it. http://pdssbn.astro.umd.edu/holdings/
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Jan 24 2012, 01:25 AM
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#2
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
I haven't modified IMG2PNG for Rosetta yet - actually I was waiting for the Mars flyby data to appear. The problem is probably that when converting the floating point (level 3) images, IMG2PNG 'knows' nothing about the data so it uses the actual data range to map the floating point values to 0-65535 (the mininum floating point value is usually set to ~0 though). This is bad if there are bright specks in the images and makes them dark. Another problem is that different filters (or more accurate - images) get stretched differently. I need to upgrade IMG2PNG to 'know' the Osiris data. I may do it this weekend or possibly earlier.
Interestingly, the Messenger data is somewhat comparable to the Osiris level 3 data since it contains floating point data. The important difference is that IMG2PNG should know how to handle the Messenger stuff. And by the way this is clearly a beautiful dataset - I get the impression that these are the best global views ever of Mars, at least if you only count framing cameras. |
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