HiRISE DEM's |
HiRISE DEM's |
Apr 13 2008, 10:46 AM
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#1
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Founder Group: Chairman Posts: 14448 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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May 19 2008, 08:37 PM
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#2
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Founder Group: Chairman Posts: 14448 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 Randy Kirk got some nice emails about them, which is good because it's his hard work that made the data, and his kindness that put it 'out there' for nutters like me to play with. Doug |
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May 20 2008, 06:36 AM
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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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May 20 2008, 06:58 AM
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#4
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Founder Group: Chairman Posts: 14448 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 http://www.dougellison.com/?p=5 is now working. That, for now, is my last treatment of the Columbia one. What I'd REALLY REALLY love to be able to do, is some sort of realtime thing where you can drive around it on a quad bike. I'm sure Half Life 2 could manage it, but I just don't know how to put a million polygons into a game like that Doug |
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