Third HSRC Release!, Includes map-projected calibrated images |
Third HSRC Release!, Includes map-projected calibrated images |
May 4 2006, 04:23 PM
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#46
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
great job! this is so cool
yay to more public releases |
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May 4 2006, 06:07 PM
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#47
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Member Group: Members Posts: 194 Joined: 8-February 04 Member No.: 10 |
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May 4 2006, 06:19 PM
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#48
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
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May 5 2006, 07:52 PM
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#49
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Newbie Group: Members Posts: 17 Joined: 25-April 05 From: Pilsen, CZ, EU Member No.: 363 |
Doug,
I just can't stress enough how magnificent the DD animations you made are. I wonder if ESA knows what they have (Have you shown them to Jim Bell?) Anyway, as I said before - the archive is now available at http://pds-geosciences.wustl.edu/geodata/m...approjected-v1/ it's biggest advantage is easy accessibility of the thumbnail jpg images. Oddly, eventhough the ESA page says it covers 1-1863, it ends at 1295. Have you found data from newer orbits in the PSA interface? |
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May 5 2006, 08:35 PM
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#50
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
Yup - via the psa you can get to 1800andsomething
The browse JPG's are utterly perfect - they're exactly what was needed, and being able to just grab an orbits data instead of using the lengthy convoluted pain-in-the-backside PSA system is a big big BIG bonus - if you can catch up to 1863, it would be great. Doug |
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Jul 20 2006, 08:41 PM
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#51
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Member Group: Admin Posts: 468 Joined: 11-February 04 From: USA Member No.: 21 |
I got a reply from the HRSC data processing manager, Dr. Thomas Roatsch, about some of the map-projected PDS/PSA tag issues, which seemed appropriate to share here.
As to the duplicate RADIANCE_OFFSET and RADIANCE_SCALING_FACTOR tags, the second ones are correct to the map projected images. For anyone particularly interested in the reflectance data, there is a necessary tag which is missing (REFLECTANCE_OFFSET). Dr. Roatsch has suggested to the PDS/PSA that they deliver a new version soon to fix both of these problems. When considering the radiance information recoverable by applying the offset and scaling factors, a third tag becomes important as well. The radiance values are in units of Watts/m^2/sr, and is not spectral radiance (Watts/m^2/sr/nm). This means that the calibrated radiance values in the images are a summation across the whole bandwidth of the filter+ccd. This is important because bandwidths of the HRSC color filters differ significantly. The red filter is 48 nm wide, green is 88 nm wide, and blue is 76 nm wide. In other words, if one didn't take this into consideration, the green filter would appear almost twice as 'bright' as the red filter, since its radiance is considered across a spectrum twice as wide. So, to recover spectral radiance from the HRSC map-projected images, one must apply the offset and scaling factors, then divide that value by the bandwidth of the filter. |
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Jul 20 2006, 08:56 PM
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#52
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
Nice and simple then
Doug |
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Jul 22 2006, 08:15 AM
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#53
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Member Group: Members Posts: 241 Joined: 22-August 05 From: Stockholm Sweden Member No.: 468 |
Dont forget to throw salt thrice over your left shoulder on a full moon night...
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Jul 25 2006, 01:52 PM
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#54
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Solar System Cartographer Group: Members Posts: 10166 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... 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 PD: 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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Guest_AlexBlackwell_* |
Jul 25 2006, 04:13 PM
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#55
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Guests |
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Jul 25 2006, 04:31 PM
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#56
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
My fav Phobos image...but I guess you're looking for something a bit better than that D |
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Jul 27 2006, 02:46 AM
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#57
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Senior Member Group: Members Posts: 1583 Joined: 14-October 05 From: Vermont Member No.: 530 |
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Jul 27 2006, 02:19 PM
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#58
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Solar System Cartographer Group: Members Posts: 10166 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... 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 PD: 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 27 2006, 02:33 PM
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#59
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
Here's one for you Phil,
Deimos has, to me at least, looked to be a much smoother almost 'softer' looking body than Phobos. Is that a symptom of the common images we see being of lower resolution, or an actual property difference between the two. Doug |
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Jul 27 2006, 03:20 PM
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#60
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Solar System Cartographer Group: Members Posts: 10166 Joined: 5-April 05 From: Canada Member No.: 227 |
It's not a resolution effect. The best Viking images of Deimos have higher resolution that the best Viking images of Phobos. Deimos is smoother because it's almost completely covered by a thick debris layer. Peter Thomas (Cornell) has argued, and I agree, that the debris is ejecta from a crater with a diameter almost as large as Deimos's longest dimension, which is visible to us as the south polar "saddle" of Deimos. Most debris from a crater like that is ejected at very low velocity (forming the heaped-up rim of a lunar crater, plus lots of that never gets outside the crater at all) and coated Deimos at once. The rest was probably re-accreted from Mars orbit. Phobos lacks a "giant" crater of the same relative scale.
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 PD: 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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