Endeavour Drive - Drivability analysis |
Endeavour Drive - Drivability analysis |
Sep 18 2008, 11:05 AM
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#1
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
http://www.sciencefriday.com/program/archives/200809191
You can listen via NPR, or via one of the web feeds that are listed on the site, but make sure you do listen if you can. |
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Sep 23 2008, 06:10 PM
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#2
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
Now seriously and back to the main topic:
Sorry to be pedantic but I still believe this task must be automated in some way. I think it’s already clear that what’s needed is a map that characterizes the terrain in terms already known like tarmac, “purgatory”, bedrock, small ripples. This map should also be of a lower resolution than the HiRISE pictures; or in other words, it should reduce an e.g. 100x100 pixels area to a single characterized point, otherwise it looses its purpose which is to allow mid and long-range route planning. One way to do this task is to slice the big picture in 100x100pix. pieces and to manually compare them with a set of pre-selected types of terrain. Needless to say that such a task would be time consuming and in case it was shared among a number of volunteers the results wouldn’t be homogeneous. What would be classified as “purgatory like” by one might be characterized as “small ripples” by another one. Another way to do this task could be again to slice the big picture in 100x100pix. pieces and to automatically characterize them. It was already proposed to use the wavelength of the dunes as an indicator so the mean wavelength of each 100x100 piece could be compared with the mean wavelengths of the reference pieces (tarmac, purgatory, etc.). The mean wavelength could be calculated, probably using FFT, and I think some of the HiRISE images (e.g. the one I use in the route map) have enough dynamic range and S/N ratio to be used for this purpose, but we need someone with experience on this area (I haven’t). I think it’s worth a try. |
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