Mercury mosaics from January 2008 Flyby |
Mercury mosaics from January 2008 Flyby |
Jul 12 2008, 11:50 PM
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Senior Member Group: Moderator Posts: 3241 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
The raw data from MESSENGER's January 14, 2008 flyby of the planet Mercury are now online on NASA Planetary Data Service's website:
http://pds-imaging.jpl.nasa.gov/data/messe...grmds_1001_new/ As such, I am proud to present a series of mosaics I have created using these raw images. These use the mosaic designs shown on the MESSENGER project's Mercury Flyby 1 Visualization Tool webpage. These mosaics were created in either Photoshop CS3 (using the Photomerge tool) or PTGui Pro (particularly for the two MASSIVE mosaics). Keep in mind that these mosaics are quite large in most cases, and it may be better just to right-click and save them to your hard drive to view them separately, rather than viewing them in your browser. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Jul 13 2008, 03:58 PM
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Senior Member Group: Moderator Posts: 3241 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
I used ISIS3 for calibration.
I'm going to try the color global mosaic next, not sure how that will look. But people can feel free to post their own products based on the MESSENGER raw images here. There are plenty of anaglyph opportunities certainly. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Jul 13 2008, 07:06 PM
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#3
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Yay, the flatfields finally work correctly:
No dust rings to be seen even after substantial enhancement. A couple of familiar Mercury shots now in approx. natural color using calibrated E,D,C filters: Compare the outbound frame with my fudged version of the official false color mosaic here. It helps to know the planet has a pretty flat spectral curve, doesn't it? I believe both versions use the same set of frames, but different filters. For some reason they magnified their image 2x. There's WAC color data for a higher resolution mosaic than that, but it will probably require map reprojection to work out. -------------------- |
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Jul 14 2008, 02:05 PM
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Yay, the flatfields finally work correctly: Hi Gordan, just to make sure I understand correctly: the flatfields are stored in a separate directory from the images, right? They are not applied to the raw image data? So you apply the flat fields as part of a calibration step before you compose your color images? Nice work, I can't wait to see more --Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Jul 14 2008, 02:18 PM
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#5
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Emily: Correct, the flatfields are in the calibration dir: http://pds-imaging.jpl.nasa.gov/data/messe..._1001_new/CALIB and are ordinary FITS files. The above was just an example Venus image through the violet filter to show no mottling/dust rings are visible.
The data is completely raw, like the Cassini EDR IMG files are. I apply the calibration procedure outlined in CALINFO.TXT in the same directory. One thing I noticed is some Mercury images have residual dark current after calibration. I'm not sure if it's actual dark current or maybe stray light or whether it's an error in my code. It shows up in volcanopele's crescent mosaic as well; as variation in background color near the limb so maybe it's a systemic issue. If it's stray light, it looks filter dependant. Could be the instrument isn't completely characterized yet. -------------------- |
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