CRISM Corner |
CRISM Corner |
Guest_AlexBlackwell_* |
Sep 28 2006, 02:14 AM
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#1
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APL-Built Mineral-Mapping Imager Begins Mission at Mars
JHU/APL For Immediate Release September 27, 2006 See also A.J.S. Rayl's story at TPS. EDIT: I changed the topic title because, as I understand it from the press release, the cover was opened, not jettisoned. This post has been edited by AlexBlackwell: Sep 28 2006, 04:48 PM |
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Nov 1 2007, 07:49 AM
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#2
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
They'll work with ISIS I presume - but I've not found a free ( as in beer ) tool to open cubes for either VIMS or CRISM easily for OSX or Windows.
Doug |
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Nov 1 2007, 11:25 AM
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#3
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
They'll work with ISIS I presume - but I've not found a free ( as in beer ) tool to open cubes for either VIMS or CRISM easily for OSX or Windows. I've been thinking of producing something for VIMS cubes for Windows, but I'm stuck at ideas how to present multispectral data like that or what output options to provide - saving entire cube as a sequence of PNGs, selective wavelengths etc. That and a general lazyness. VIMS is complicated in that it has both a VIS channel and an IR channel which are quite different, often having different resolutions. VIS is very, very badly affected by dark current while IR channel (Titan!) would be probably of most interest to everyone. I haven't even touched that one yet let alone attempted calibration. SteveM, thanks for the link, I was wondering where CRISM data is! -------------------- |
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Nov 1 2007, 03:45 PM
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#4
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I've been thinking of producing something for VIMS cubes for Windows, but I'm stuck at ideas how to present multispectral data like that or what output options to provide - saving entire cube as a sequence of PNGs, selective wavelengths etc. That and a general lazyness. VIMS is complicated in that it has both a VIS channel and an IR channel which are quite different, often having different resolutions. VIS is very, very badly affected by dark current while IR channel (Titan!) would be probably of most interest to everyone. I haven't even touched that one yet let alone attempted calibration. Well, I think the saving-as-PNGs place is a great way to start. Another straightforward product would be a .mov running through all the wavelengths, because then you can use the little slider to scroll quickly back and forth. (Hmm...in an ideal world you'd want to know which wavelength you're looking at as you scroll, which would either mean outputting text on the image, which sounds hard to do, or maybe inserting a black frame every 10th frame or something...hmmm...) Selected wavelengths would be good. Looking at the CRISM calibrated products page, you can get an idea of which wavelengths are likely to be most valuable there. For example, 1900 nm and 2100 nm are good bands for looking for water-rich minerals. For VIMS, the idea is similar; try to find a couple spectra of interesting materials (water ice and CO2 would be the big ones I guess) and pick out some wavelengths in absorptions and continuum. If you feel like getting fancy you can try some band math; all the CRISM team's math is documented. I'll bet that although they've developed fancy algorithms for calculating band depths and stuff, that you can probably capture 80% of the information in their fancy products with much simpler algorithms like straight ratios of two bands. At Titan, I'll bet a straight ratio of two bands, one in a window and one in the adjacent continuum, would cancel out most of those pesky atmospheric effects. In short: please give it a go! --Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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