Fig. 2

image

Top: photometrically corrected RGB image produced from NAC images using F88 (743.7 nm) for the R channel, F82(649.2 nm) for the G channel, and F84 (480.7 nm) for the B channel. The acquisition time (UT) for F82 as the reference image is 23:58:09 on 9 April 2016. Center: corresponding distribution of phase angle in degrees at the time of 23:58:09 on 9 April 2016. Bottom: same area covered by a NAC image acquired on 10 June 2016 at α = 72°. The illumination condition of this image makes it easier to recognize different geomorphological regions. The difference in perspective between the panels causes the difference in relative orientations of the ROI boxes.

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