Endeavour Crater, And again shall we conquer the Remoteness |
Endeavour Crater, And again shall we conquer the Remoteness |
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#201
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![]() Special Cookie ![]() ![]() ![]() ![]() Group: Members Posts: 2168 Joined: 6-April 05 From: Sintra | Portugal Member No.: 228 ![]() |
Opportunity is getting ready to embark on her most extraordinary journey, a true rover epic.
As information regarding how to win the distance are being collected here, and the emotional last views from Victoria Crater are being discussed here, I thought about creating a new thread that will surely become an obligatory stop as the tall peaks and other features of Endeavour start to rise in the horizon. Here we will be able to discuss the location of features seen from the distance, references that will help us understanding better what we are seing and that will, fortunately, feed our spirit across the long sail across the Meridiani sandwaves. Ultreya! ![]() I give it a kick with this navcam image, comparing it with Astro0's original (beautiful...) image: I'm sure James Canvin will correct me... ![]() EDITED: I can't resist...I tried! I honestly tried, but it is stronger than me...so many features ahead and not a single name?! ![]() Seriously, at Victoria we had features named after places visited by the vessel, and now for Endeavour? Assuming that Oppy will succeed on her quest will the mission keep the same policy, of naming places after Endeavour's tour? If so, there may be some names in common with Victoria... ![]() While we are ready to leave the port once more I remembered that we could start naming, internally, (in order to have catchier landmark references... ![]() We could follow the order presented here. Let me just edit the image up there... ![]() -------------------- "Ride, boldly ride," The shade replied, "If you seek for Eldorado!"
Edgar Alan Poe |
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#202
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 ![]() |
The numbers you mention just describe the "resolution" between sample strips, Tom. There is also the question of resolution along the strip -- i.e., what was the interval between laser returns?
Also, "resolution" isn't exactly the right term, I think -- the *spacing* between sample strips is anywhere from 1/128 to 1/256 of a degree. The actual width of the strip of terrain from which a laser return is detected is somewhat narrower than that, I believe. So, instead of having a constant "pixel" coverage of laser returns, there is a matrix of laser-return dots which represent terrain elevation data, but for which no single dot "touches" any of its adjacent dots. In other words, there are from tens to several hundreds of meters of terrain between each sampled "pixel" and the next closest "pixel." Think of it this way -- go to a plot of land 25 km on a side, lay out ten lines 250 meters apart and 25 km long. Walk along each of those lines and take an elevation reading every 100 meters or so. Then plot all of your elevation readings as a series of dots on a grid. That's the raw MOLA data. (Totally unsure about the spacing along the lines, but ~100 meters sounds about right, at least for illustration purposes.) Add in beam spread, and you can see how difficult it was to create elevation maps from the data. I believe the pretty maps that the MOLA team created *all* used smoothing algorithms to present the instrument's data as general elevation maps. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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