HiRISE DEM's Options

[Nirgal]

Is this news?

Absolutely phantastic !!

This must be the *perfect* complement for my single-image shape-from-shading (SFS) based DEMs.

While the SFS-DEMs provide real 3D detail down to the single-pixel level (i.e. without "draping" of the high-res 2D image over the terrain) it is unfortunately not very accurate in the mid- and large scale variations. ... but this is just where the HiRISE DEMs seem to be impressively accurate... so one of the next things I would like to try is to combine the high-frequency SFS-based 3D details with the accurate low-frequency variations of the published HiRISE DEMs.
... the result should be really interesting.

[ElkGroveDan]

If you view any of those fly-overs, be sure and set the QT viewer to full screen - the resolution is that good, and worth the experience. I'm not sure I would have taken the same flight path over Columbia Hills but it's an amazing ride nonetheless.

[charborob]

Not having the knowledge nor the time to make use of these DEMs myself, I hope some more enterprising members of this forum try their hand at producing some flyovers.

[Zack Moratto]

NASA Ames is working on a stereo pipeline for automated DEM generation: http://ti.arc.nasa.gov/project/ngt/stereo/

Their documentation has instructions for HiRISE. MOC and CTX are in there as well, although I will point out that their camera model for CTX is incorrect so any CTX DEMs created with this software are inaccurate.

Care to elaborate on what is wrong with the CTX models? It might be an easy fix to send to the ISIS developers as our camera models are their camera models.

[djellison]

I've picked four favorites from the new batch - plus a few others from Pete - which I'll be trying to get rendered this week. Probably not as polished and pretty as the Columbia Hills anim, but they should be a bit of fun

[tharrison]

Care to elaborate on what is wrong with the CTX models? It might be an easy fix to send to the ISIS developers as our camera models are their camera models.

I don't know what it is that's off, I was just told by the software folks at MSSS that there was an issue. Trent Hare is getting in touch with them to figure out what the problem is.

[Zack Moratto]

Okay fine. I'll bug Trent next week when I see him. A while back MSSS did work with Larry Edwards that involved ASP. Since the open source release his custom camera models for MOCNA and CTX are no longer a part of our software. We now use ISIS to provide those. I hope to get this all worked out as a lot of our users are creating 3D models from CTX.

[tharrison]

Trent got in touch with our software folks this morning and we figured out that the issue was the prototype vs. the official release of the stereo pipeline. Joe Fahle says that the camera model in ISIS was obviously wrong until iak/mroctxAddendum003.ti, but now there is little difference between the MSSS CTX camera model and that used by ISIS. So, it sounds like the newly released version should be all right...sorry about that, I was told not to use the pipeline because of this issue in December, after the "new" release, so I assumed the problem still applied.

[djellison]

The results of processing the new HiRISE team DEM's are beginning to appear. They're not as polished and pretty as the Columbia Hills one. Main reason is time. These are taking approx 1-2 mins per frame, at 750 frames each, so even with my i7 desktop, plus Q6600 render zombie (with occasional pauses for Helen and I to have some practice in dealing with the upcoming zombie apocalypse via L4D ) - it's 6-12 hrs each. So I had to turn down the 'pretty' quite a lot just to get through them in terms of rendering - AND in terms of processing. BJ's all new img2png helps speed up the processing pipeline massively.

Early results so far :

Athabasca Valles
http://www.youtube.com/watch?v=uQYDElIMQ2s
from http://hirise.lpl.arizona.edu/dtm/dtm.php?ID=PSP_002661_1895

Mojave Crater
http://www.youtube.com/watch?v=Fp8WU05W0Jg
from http://hirise.lpl.arizona.edu/dtm/dtm.php?ID=PSP_001481_1875

My render queue still includes Gale Crater, Bahram Vallis, Candor Chasma, Juventae Chasma. If you see a particular DEM from HiRISE and think " I MUST SEE THAT " - shout, and I'll see if it's worth animating.

[Vultur]

Interesting how there's a crater right on top of the Mojave Crater wall.

But I suppose if you drop enough asteroids on a planet some will land in unlikely-looking places...

[remcook]

Still pretty wow !

[elakdawalla]

Wow there's a lot of texture in those DEMs! Marvelous. Can't wait to see the rest.

[Mars3D]

Here's a couple of images created from the new HiRISE DEM's.

Olympus Mons Basal Scarp
using the DEM from http://hirise.lpl.arizona.edu/dtm/dtm.php?ID=PSP_001432_2015

Potential New Gully Bright Deposits
using the DEM from http://hirise.lpl.arizona.edu/dtm/dtm.php?ID=PSP_001714_1415

- Adrian

[Nirgal]

The results of processing the new HiRISE team DEM's are beginning to appear. ...
Early results so far :

WOW ! those movies are simply breathtaking ... Mars not only in 3D but in true 4D -> awesome.

Just a quick question: how many 3D posts (or polygons) are there rendered in each movie frame ?

[djellison]

It's done in the renderer as required by each frame - I've done actual models of most of these as well, up to about 1.2 million polygons, and in the near-field, these renders look better than those models. Certainly several hundred thousand in each rendered frame. Technically - you could pull about 50 million polys out of each one.