[X] My Assistant

[DavidVicari]

What do you guys think about the handful of color images released from Mars Express.


This is the Spirit landing site. The dust devil tracks look way too green to me. Shouldn't they be more red/brown/gray.



Doesn't this channel look too blue?


Are these supposed to be true color or are they false color in order to enhance features?
If they are true color, is it more accurate then what we have seen from Global Surveyor and Odyssey?

[djellison]

http://www.dlr.de/en/Desktopdefault.aspx/t.../129_read-2681/ outlines much of the process, Jan-Peter Muller spoke to the BAA in Cambridge last year and said that the process is just about automated with a DEM, the projected colour data all processed within a few hours of reception.

I think, via on-board binning, the colour channels are 4 x 4 binned ( so typically 100m/pixel) whereas Nadir data is unbinned at 25m/pixel....ish

The only angles I've found for the instrument other than the extremes that Emily mentioned, are these from a PDF about the airborne version of HRSC...

Swath Angle 29.1°
Outer Stereo Angle ± 20.5° 520-760 nm
Inner Stereo Angle ± 12°
Nadir Channel 0°
Blue Channel - 4.6° 435-520 nm
Green Channel - 2.3° 522-592 nm
Red Channel + 2.3° 626-686 nm
IR Channel + 4.6° 780-850 nm

I'm not sure how, if at all, that matches up with the space-borne version - but I've noticed some fairly extreme miss-matching just between the IR, G and B channels when looking at harsh elevation such as at Val.Mar.

Doug

[djellison]

Swath Angle 29.1°
Outer Stereo Angle ± 20.5° 520-760 nm
Inner Stereo Angle ± 12°
Nadir Channel 0°
Blue Channel - 4.6° 435-520 nm
Green Channel - 2.3° 522-592 nm
Red Channel + 2.3° 626-686 nm
IR Channel + 4.6° 780-850 nm

I'm not sure how, if at all, that matches up with the space-borne version - but I've noticed some fairly extreme miss-matching just between the IR, G and B channels when looking at harsh elevation such as at Val.Mar.

Has anyone been able to find something better than these figures?

Doug