Updated Titan Map |
Updated Titan Map |
Apr 1 2016, 06:21 AM
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#211
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Solar System Cartographer Group: Members Posts: 10127 Joined: 5-April 05 From: Canada Member No.: 227 |
"Just quibbling a bit...."
A groundless quibble, I'm afraid. This is VIMS data, collected over more than a decade - the high resolution VIMS cubes only cover small areas. So all that material has been assembled into a global mosaic (a mapping procedure if ever there was one) and is presented to us in an orthographic map projection - another mapping procedure. The small image of a crater might be 'not a map' but the global mosaic certainly is. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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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Apr 2 2016, 12:31 AM
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#212
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
A basemap for mapping, maybe. But I wouldn't consider the VIMS dataset an interpreted or representative map product. Nor would I consider the SAR mosaic, even if normalized to a standard incidence angle, a true map product.
Just at what point does an image become a map product is a good question, and probably open to interpretation? Is an image a map already at acquisition? After calibration? Data correction? Radiometric correction (very very difficult on Titan)? Mosaic assembly? Projection? Contrast-enhancement and recolorization with a color scale? Scribbling colors and annotations on the data? For me, mapping is the point where someone start scribbling interpretations, annotations, and representations on top of the dataset: "The rim of the crater is located here". "This is a mountain, the boundary is here." "This land is called Adiri" "Here there be tygers.", etc. -Mike -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Apr 2 2016, 12:59 AM
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#213
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
QUOTE Just at what point does an image become a map product it depends on the person/artist for me it is when i can render a image from a sphere or mesh , basically a seamless texture for others it is the annotation of locations |
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Dec 26 2016, 09:05 PM
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#214
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Member Group: Members Posts: 106 Joined: 26-September 05 Member No.: 508 |
Here is a non-local denoising filter: http://ximagic.com/d_index.html . Not as good looking as Antoine Lucas' work but better than none.
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Dec 28 2016, 09:55 AM
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#215
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Member Group: Members Posts: 106 Joined: 26-September 05 Member No.: 508 |
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Dec 28 2016, 01:44 PM
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#216
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Member Group: Members Posts: 909 Joined: 4-September 06 From: Boston Member No.: 1102 |
Your link gave seven different denoising filters, which one or ones did you use?
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Dec 28 2016, 03:33 PM
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#217
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Senior Member Group: Members Posts: 1621 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Very nice view of Ligeia Mare. In the long run this could really improve the global radar maps. On the link I recall just one of the filters was the "non-local" one.
-------------------- Steve [ my home page and planetary maps page ]
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Dec 28 2016, 04:13 PM
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#218
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Member Group: Members Posts: 106 Joined: 26-September 05 Member No.: 508 |
It is a single plugin with 7 different algorithms. Non-Local Denoising gives the best results which is the same method used by Antoine Lucas. There is also a free Java plugin for ImageJ used by medical researchers which I did not try. http://imagej.net/Non_Local_Means_Denoise
Attached image is a crop from PIA09218, uncompressed files give a better result as expected (slightly sharpened). The success of the algorithm is measured by the difference with the original, which should be purely noise and not have any discernible features common with the original (may be except noise bands, artifacts etc.) |
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Apr 1 2017, 02:40 PM
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#219
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Senior Member Group: Members Posts: 1621 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Here's a paper describing techniques for extracting more detail from ISS images.
https://arxiv.org/pdf/1103.3215.pdf -------------------- Steve [ my home page and planetary maps page ]
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Apr 1 2017, 04:03 PM
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#220
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Solar System Cartographer Group: Members Posts: 10127 Joined: 5-April 05 From: Canada Member No.: 227 |
I find this even more impressive:
http://www.hou.usra.edu/meetings/lpsc2017/eposter/2518.pdf (link to LPSC poster) Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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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Apr 1 2017, 05:14 PM
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#221
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Senior Member Group: Members Posts: 1621 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Thank for noting this Phil, I earlier inadvertantly posted another semi-related link. Here is what I was also looking at, the same work that you are noting:
http://www.hou.usra.edu/meetings/lpsc2017/pdf/2518.pdf It's neat to see how the ISS images now show more detail near the Huygens landing site. -------------------- Steve [ my home page and planetary maps page ]
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Jun 30 2018, 05:27 PM
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#222
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
I'm pleased to finally be able to reveal the fruits of a project that's been a long time (~4 years) in the making: an updated, amended, and restored version of the 2013 USGS Titan Cassini Controlled ISS Global Mosaic.
Cassini ISS Titan Mosaic --- Equatorial (USGS/Ian Regan) Cassini ISS Titan Mosaic --- North Polar (USGS/Ian Regan) Cassini ISS Titan Mosaic --- South Polar (USGS/Ian Regan) by Ian Regan, on Flickr Credit: NASA/JPL/Space Science Institute/Cassini Data Analysis Program/USGS Astrogeology Science Center/Ian Regan This restoration was done primarily for the big screen film IN SATURN'S RINGS, by Stephen van Vuuren. For more details on the mosaic, and how I processed the polar regions completely from scratch, please visit the film's website: https://www.insaturnsrings.com/titan-seam-blending -------------------- |
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Jul 1 2018, 01:04 AM
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#223
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Member Group: Members Posts: 314 Joined: 1-October 06 Member No.: 1206 |
Wonderful!
Just out of interest. Is that a lake, past or present, at roughly the 6 o/clock position perhaps about 60 south in the southern hemisphere polar projection? P |
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Jul 1 2018, 01:15 AM
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#224
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Thanks!
In answer to your question, that dark feature is Polaznik Macula — a formation that plays host to two suspected temperate lakes: Sionascaig Lacus and Urmia Lacus: http://thedragonstales.blogspot.com/2015/0...rmia-lacus.html -------------------- |
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Jul 1 2018, 01:17 PM
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#225
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
Truly magnificent maps! A joy to let the gaze wander freely at last over this wondrous world.
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