Beyer, Ross A. (ARC-SST)[SETI INSTITUTE]
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to Rachael Hoover, Ames Stereo Pipeline Support
Rachael,
Are the slope streaks on those slopes different between the two images?
If the slope streaks or deposits at the foot of the slopes are different between the two images, you may need to NULL out the streaks so that ASP doesn’t try and correlate them. The correlates do fine with two pictures of a horse, but if someone spray-paints the horse to look like a zebra between picture1 and picture2, even though the horse has the same 3D shape, the image correlator will have problems. However, I’d leave this for a last resort.
If so, that might complicate the matcher.
Are you doing bundle adjustment prior to stereo? If not, that might help, too.
Definitely follow Oleg’s advice, and play with a small cropped area to make experiments go faster. The SGM (--stereo-algorithm 2) or MGM (--stereo-algorithm 3) algorithms might do better, as he suggests, and playing with --subpixel-mode.
Additionally, following an iterative process to slowly build up to the DEM resolution you want (rather than trying to go for the full-resolution first off), following
https://github.com/USGS-Astrogeology/asp_scripts (and LPSC abstracts referenced therein) or
https://github.com/AndrewAnnex/asap_stereo might help.
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Ross
http://RossBeyer.net/science/