HiRISE DEM's |
HiRISE DEM's |
![]()
Post
#1
|
|
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. |
|
|
![]() |
![]()
Post
#2
|
|
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 |
|
|
![]()
Post
#3
|
|
![]() 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 -
|
|
|
![]()
Post
#4
|
|
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 |
|
|
![]() ![]() |
![]() |
Lo-Fi Version | Time is now: 14th June 2024 - 12:49 AM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |
![]() |