Gordii Dorsum Again

We've looked at this before but it is a massive file. I'm working with the 1.44 GB Greyscale JP2 file. The image below is from the far north of the polygonal ridge system . It is from the left (West) side of the far North East of the ridge system.

On the left image I give a clue where to find the pillar. If I have the dimensions right I make the pillar about 12 metres tall (approx.). Which my gut says is too tall. So maybe I'm out. I get that figure by extrapolating 25cm = 1 pixel as per the data provided just below where you download the file. To open the file I use Irfan View. I use the "Capture Visible Window Area" under Edit and save as a Jpeg file. This file has a height of 613 pixels. To get the 22 metres figure I brute the answer by working out the height of the pillar relative to the whole image. If this is a stone age way of working I'll happily take advice. Anyhow I'm getting a ball park figure of 12m. if anyone is more expert at this I'd very much like to know what height they get?



okay edit: the image makes more sense if inverted. Maybe shave a couple of metres off that 12m figure.



Last edit: I've outlined what I think is the shape of the "pillar" structure.

cool image, I will deff check out that raw photo !! thanks
Do you by chance have and url to the tiff or jpg?

oops! Though I included a link
hirise.lpl.arizona.edu/ESP_017348_1910
You can download jpeg versions but you really need the jp2 file which is big. I use Irfan View (freeware) to open the file but it is still cumbersome. But there is an option to split the image into smaller jpeg files. But with the loss of information it is better to take a screen shot and paste that in whatever software you are using.

I put together a quick video to show folks how to find the pillar feature.

Need help distinguishing a duck-rabbit perspective problem. Is the feature a dark column (as per images 1, 2, and possibly 3) or is it two lighter stone structures with dark shadow between them (per 4, 5, 6 and maybe 3). And if the latter are they vertical per 4 or are more horizontal as per 5. I have my opinion but would like feedback please.

Found a new mage viewer: Highview.
www.uahirise.org/hiview/
Handles large jp2 file effortlessly compared to irfanview that struggles with the massive file.

Higview has less tool and gizmos but it does have a pixel measurement tool. This answers my initial question. The length/height of the column is around 7 metres.

Getting on much better with the Highview viewer. Nice software.

Also think I've answered most of my own questions. I judge the image below is the best perspective as the shadows are consistent on this view. the vertical line is also consistent with the blocks that make the line of the wall.

the pillar/wall feature is approximately 21 pixels which at 27.8 cm per pixel as per the Hirise website makes 5.8 metre.

LOL, I've always had trouble with judging perspective, but my eyes seem to deal with Image #4 best. So that would put the structure at about 16 1/2 feet tall, which would work out to about 3 stories, more or less? Very nice find, and I appreciate ya'll posting the link to HiView again, I had it at one time, then forgot about it. Thanks, beautiful images!