HiRISE DEM's |
HiRISE DEM's |
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#1
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 ![]() |
Late last week I stumbled upon a few HiRISE derived DEM's (Randy Kirk works his magic once again!)
http://webgis.wr.usgs.gov/ftphirise/index.jsp (URL now down) I'm working on both Vic Crater and the Columbia Hills. Fortunately, now I've got a Mac, I can use ISIS. I've figured out a fairly simple flow ( isis2raw as 16 bit unsigned, and then imported into Photoshop ) to take DEM CUB's and make 16 bit PNG's ![]() Just to demo how important that is for me as an animator - sliced comparisons of 8bit vs 16 bit. A busy week unfortunately, but animations of various sorts are in the pipeline. |
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#2
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 ![]() |
The cliffs are a bit rounded off, just a symptom of the resolution (1m per 'pixel' for elevation) really.
And, to the very best of my abilities, they are accurate for elevation, as close as I could possibly make it. The clincher is that rendering the Columbia one from the landing site - it's a perfect replica of the success pan images of the hills. The proper movies are here - http://planetary.org/blog/article/00001423/ - although I intend to update the Columbia one later today - links later ![]() Doug |
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#3
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 ![]() |
The proper movies are here - http://planetary.org/blog/article/00001423/ Now I can see them and are superb! Thanks. What do you think about adding a local high-res texture based on last panoramas, all around the MERs? I think this would add dramatic realism, reducing also the innatural contrast between rovers and smoothed DEM terrain... -------------------- I always think before posting! - Marco -
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#4
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 ![]() |
I think this would add dramatic realism Two problems with that. If I had, say, 1cm/pixel imagery around the rover - then my image map would have to be 1cm per pixel. There isn't an easy way to accurately place a second texture on top of the MRO one without actually making the whole thing 1cm pixel. That would mean a texture 800,000 pixels across. No cigar. I went down that road with CTX - on - HRSC DEM's. It was a bloody nightmare, and the results didn't pay off. The other problem is that at the moment, it all sits together quite nicely. Panoramas don't make good maps very easily.Only a few M from the rover, it's warped and distorted beyond the point of usefullness. ( for eg - http://pds-imaging.jpl.nasa.gov/data/mer2-...8l000m2.img.jpg ) and for the brief moment we are close to the rover, it wouldn't be worth the hassle. Adding terrain meshes to the Victoria crater one is something I've already had a look at ( I thought the capes might benefit ) but given up on. The meshes themselves just don't stand up to the level of quality to make it worth while. Always helps to actually publish the damn thing ![]() ![]() Doug |
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#5
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 ![]() |
Doug, I perfectly understand the issue you described, I had same problem when I tried to realize a "power of 10"-like movie initially showing all the red planed and then zooming on one rover (Emily suggested such idea long time ago, do you remember?).
Now I solved the issue by making a dedicated POV-RAY script who shades between various textures with different scales, anyway I abandoned the mars-zoom idea due to absence of time (for the moment!). Anyway, this idea is working well only if you strongly zoom on a planar surface, so is not applicable to your 3D DEM... I think the best way to avoid use of mega-textures is to overlap a local, texturized "mini_DEM" surface on the big one, eventually using 3D terrain model computed from MER stereo cam (someting like this was available on venerable "Maestro" JPL software... now I do not know where to find it). In the outer parts, such mini-DEM should appear progressively shaded in order to have a smooth transition effect. I know is not simple, it is only a suggestion for possible, future works... About your last treatment of the Columbia movie, I like it very much. My only observation is about the colors: personally, I would like more saturation, with different hue between red terrain and a yellow artificial sky... ![]() -------------------- I always think before posting! - Marco -
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