Jim Bell Q'n'a, October 19, 2006, Your questions answered! |
Jim Bell Q'n'a, October 19, 2006, Your questions answered! |
Oct 20 2006, 12:06 AM
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
For your fun and enjoyment, a new Jim'n'Doug show!
http://www.planetary.org/explore/topics/ma...vers/audio.html --Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Oct 25 2006, 08:00 PM
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Member Group: Members Posts: 656 Joined: 20-April 05 From: League City, Texas Member No.: 285 |
Just a quick follow-on to the sun-finding accuracy: while the precision of finding the solar disk within an image can be good to half a pixel as Jim mentioned, the pointing accuracy of the camera masthead is rather worse. I forget the exact figure, but as I recall the relative pointing accuracy of the pancam masthead was something like 0.1 degrees (a minor limitation for automated panorama stitching programs). The overall orientation determination combines the sun-finder results with internal vehicle level data, which has some additional error. Finally the sun-finding algorithm is only performed at major sites, rather than following every drive, and in between the vehicle's self-orientation knowlege may drift up to around 1.5 degrees.
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Oct 25 2006, 08:03 PM
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
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