DSCOVR |
DSCOVR |
Jan 6 2006, 08:55 PM
Post
#1
|
|
Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
ADMIN NOTE: Please note that this topic was unavoidably poltical before the 'No Politics' rule. Please restrict future comments to the mission/spacecraft/news updates etc.
WHAT'S NEW Robert L. Park Friday, 6 Jan 06 Washington, DC DEEP SPACE CLIMATE OBSERVATORY KILLED. http://bobpark.physics.umd.edu/index.html -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
|
|
Feb 29 2016, 11:05 PM
Post
#2
|
|
Junior Member Group: Members Posts: 22 Joined: 7-January 13 Member No.: 6834 |
For the first images in particular, the quaternion attitude error is much more than 1 pixel, even sometime more than 1 Field of View !
My observations are: - The "Earth north is toward image top" is roughly true, but not exactly. There is always are ~1° to 5° typically (with peaks at more than 15°) error between real north and image "up". - The latest the images, the best their orientation wrt north. - Some images a completely black, for some reason. - There are long missing periods in the data that we know exist. - There is uncorrected or residual image distortion. I could struggle estimate the polynomials, but it would be a lot of effort for a faint effect (~1 to 2 pixels). I could re-calculate the quaternion according to what is visible in the images, update the image "up" toward a more accurate "north", and when corrected everything seems much prettier. I'll try to post a video showing this result. |
|
|
Lo-Fi Version | Time is now: 31st October 2024 - 11:42 PM |
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. |