Posted by
Catherine Zucker on
Jan 02, 2011; 9:40pm
URL: http://imagej.273.s1.nabble.com/Tracking-Image-Changes-with-IMAGEJ-tp3685182p3685184.html
Hi! I asked a question about tracking image changes a while back. Thanks for
all the help! I was wondering if anyone could give me more specific advice
if I attached the actual images I was using. All my images are grayscale.
They all come off of the HIRISE imaging database, which takes high
resolution images of the Martian surface. The dunes are pretty clearly
delineated via their raised ridges. The files are too large to attach, but
I've included the links to two images I’m analyzing from the HIRISE
database. I'm working with the images entitled "full image (grayscale, map
projected)" found in the link on the right hand side of the page. Both
images have a scale of 50 cm/pixel. In the bottom right corner of each
image, inside the impact crater, there's a raised sand mound that I know
hasn't moved. Specifically, I'm trying to measure how many meters the sand
dunes above that impact crater have moved from one image to the next. It
doesn't need to be perfect. I just need a rough estimate. At most, I'll
analyze two or three image sets. I can do as many steps by hand as is
necessary to achieve a successful result. Thank you so much! ~Catherine
From November 2007:
http://hirise.lpl.arizona.edu/PSP_005931_1080From July 2009:
http://hirise.lpl.arizona.edu/ESP_013829_1080On Tue, Dec 14, 2010 at 1:56 PM, Damon Poburko <
[hidden email]>wrote:
> Hi Catherine,
>
> Sounds like a fun project. We could probably use a little more info on
> what kinds of features you want to track. Do the dunes stand out clearly
> from other features? Do they have a common shape? Are you working with color
> or grayscale images? How do you define "dune" vs "not dune" in the images?
> It might be helpfull if you could provide some example imags. I'm sure
> ImageJ is capable of measuring what you want to know. Just be sure to
> provide a little more detail on what exactly you want to measure. Also, how
> many images are you planning to ananlyze. Is it few enough that it will be
> reasonable to do a few steps by hand?
>
> Cheers,
> Damon
>
>
> On 12/14/2010 10:08 AM, Catherine Zucker wrote:
>
>> Hi,
>> I'm a high school senior researching dune migration on Mars. I need to
>> measure how many meters the dunes have moved in a certain number of months.
>> I've been trying to do this with IMAGEJ, but am finding it difficult. Does
>> anyone know a way to track the migration of an entire dune using IMAGEJ?
>> Does anyone have experience with tracking image changes? Thanks!
>>
>