Charon Surface Observations: NH Post-Encounter Phase, 1 Aug 2015- TBD |
Charon Surface Observations: NH Post-Encounter Phase, 1 Aug 2015- TBD |
Aug 1 2015, 06:02 PM
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
This topic is for images and discussion of same received after 1 Aug 2015.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Oct 13 2015, 12:16 AM
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
I have been experimenting with generating a DEM of Charon from a stereo pair. The resulting DEM is extremely crude and noisy, my software isn't very sophisticated and the JPG compression artifacts mess things up but at least I'm getting something that may be interesting. Here is a color coded DEM in simple cylindrical projection generated using images lor_0299175643_0x630_sci_4.jpg and lor_0299168728_0x630_sci_3.jpg together with an image showing the terrain convered by the DEM:
The are some errors due to the fact that I don't know the exact viewing geometry of the source images (the accuracy to which I could reverse engineer it is limited). The DEM is also noisy and low-res but it can be used to make crude estimates of relative elevation differences. For example the big crater at the left edge is probably 1-1.5 km deep. The depression/'canyon' at bottom and extending to the right edge is probably ~2.5 km deep but this is somewhat difficult to estimate due to noise in the DEM and the depth may also be variable. But what's really interesting is that the DEM reveals a possible gentle, large scale depression (the big blue area). I can't completely rule out that the southern edge of this feature could be an artifact caused by inaccurate viewing geometry but a more probable explanation is that this is a real feature. Here is one of the two images I used to make the DEM with the very approximate boundary of the possible depression indicated with green dots: I think it should be possible to generate considerably better DEMs than this one, even when JPG source images are used. I have been looking for software (mainly free/open source stuff) to use instead of what I'm using now. I don't know yet what's going to come out of that but a lot has happened in this field since I originally wrote my (crude) stereo software several years ago. |
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Oct 13 2015, 10:05 AM
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
But what's really interesting is that the DEM reveals a possible gentle, large scale depression (the big blue area). I can't completely rule out that the southern edge of this feature could be an artifact caused by inaccurate viewing geometry but a more probable explanation is that this is a real feature. I see major parts of your big blue area as depression but I think that circular shape is partly caused by artifacts. I think that central part (ridges) has different origin. My interpretation is that depressions are probably part of the same event which caused southern hemisphere resurfacing. Here is quick graphics which shows boundaries of different areas. Blue boundary is edge of resurfaced southern hemisphere. Green boundary is continuation of this resurfacing event through central chasmata system. Red boundary shows edges of another depressions (they are visible in your DEM) which could be another part of the same southern hemisphere resurfacing event. -------------------- |
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