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Updated Titan Map
Phil Stooke
post Apr 1 2016, 06:21 AM
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"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



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Juramike
post Apr 2 2016, 12:31 AM
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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


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JohnVV
post Apr 2 2016, 12:59 AM
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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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t_oner
post Dec 26 2016, 09:05 PM
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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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t_oner
post Dec 28 2016, 09:55 AM
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Part of Ligeia Mare.
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Floyd
post Dec 28 2016, 01:44 PM
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Your link gave seven different denoising filters, which one or ones did you use?


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scalbers
post Dec 28 2016, 03:33 PM
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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.


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t_oner
post Dec 28 2016, 04:13 PM
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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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scalbers
post Apr 1 2017, 02:40 PM
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Here's a paper describing techniques for extracting more detail from ISS images.

https://arxiv.org/pdf/1103.3215.pdf


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Phil Stooke
post Apr 1 2017, 04:03 PM
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I find this even more impressive:

http://www.hou.usra.edu/meetings/lpsc2017/eposter/2518.pdf

(link to LPSC poster)

Phil


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... because the Solar System ain't gonna map itself.

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scalbers
post Apr 1 2017, 05:14 PM
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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.


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Ian R
post Jun 30 2018, 05:27 PM
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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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antipode
post Jul 1 2018, 01:04 AM
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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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Ian R
post Jul 1 2018, 01:15 AM
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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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ngunn
post Jul 1 2018, 01:17 PM
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Truly magnificent maps! A joy to let the gaze wander freely at last over this wondrous world.
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