posted on Feb, 27 2007 @ 02:09 AM
Here is my analysis of the photo, because I can't get the hires due to lack of memory I have to go with the subpar "blow-up" provided on the NASA
North is up.
The area is characterized by a nearly homogenous Albedo (being labeled Red I'm assuming it's in the Red to infrared wavelengths) the texture can be
seperated into two units a smooth texture and a mottled texture. Two features dominate the photo and are towards the center of the field of view and
are characterized by a higher elevation than the surrounding and the surfaces of these features are the mottled texture. Between them is a similar
hill of probably equal height (hard to tell without stereo but suggested by lengths of shadows).
The upper right corner has a same hill feature.
Running diagonally from the upper left 1/3rd to the middle right is a marcation between a lower albedo (south) and a higher albedo to the north.
Through irregular locations are craters of various sizes. The craters have a circular rim and the shadows are on the inside left of the rim.
The sun angle is approximately 41 degrees meaning the shadows will be slightly longer than the object is high, because of the steepness of the rim the
shadows extend to the edge or beyond the edge of the rim and into the interior of the craters. Suggesting a slope of about 40 degrees (equal to sun
angle) which will be referred to as an Angle of repose.
Examining the rises (hills) before mentioned as the two dominant features: The sides of the rises have nearly parallel linear to slightly sinuous
rills that run up the slope almost parallel to gradient.
The flat, regions also have linear to slightly sinuous nearly parallel rills but they are local not regional.
The shapes of the rises are rounded.
The fact the shadows barely extend past the slopes suggests that the slopes are at low angles.
The mottled texture is dominantly caused by the numerous shadows cast by rocks. The rises are probably remnant featuers (meaning not deposited) and
the low slope angle suggests their slopes have not been well eroded. The flat broad plains in between due to the sinuous-linear rills is probably a
sand sea or dune field or lava flow or both. The rills are probably dunes.
This is plausible because suggesting the area is originally some low rolling hills with eroded features such as boulders, the lower areas are now
filled by sand and/or a lava flow and so the boulders are obscured or removed. The sand and/or lava flow would not have traces of boulders
The strange shapes of the rises seem independent of any depositional activity by sand or dust, and any erosional/depositional characteristics of
The higher albedo northern plain seems indicative of lava due to its homogenous and slightly bumpy texture.
The lack of sand within craters on the northern surface suggests that area is deprived of sand...the abundance of it in the southern surface suggests
that prevailing winds favors deposition in that region.
There's some more I could probably say about the area, but I want to now direct attention to the oddity in mind.
The circular mound has possible dimensions.
Since each pixel is about 0.29m the circular mound is probably 100 feet high (give or take a bit) and the slope is probably that of a typical
drive-way...1% gradient or so...
It looks like an odd mound but it'd probably be seen as a circular hump from the ground.
There is a definate structure to the top but it is obscured by sand//dust. But there is obvious fracturing along the rim by tensional forces since
there is nothing there to pull it apart it is probably due to some form of exfoliation. Having been a feature made probably at some shallow depth
(there is little uplift on Mars if any) then it surely was shallow, normally such feature on Earth would be long eroded before exfoliation took palce
but on Mars billions of years has probably allowed the structure to fall apart in a circular manner.
There that's about all I think can be gotten from a picture like that given the context and resolution and etc.
[edit on 27-2-2007 by FreiMaurer]