[GRASS-user] value differences between landsat images
michael.barton at asu.edu
Wed May 21 02:30:47 EDT 2008
Thanks. This is very helpful.
On 5/20/08 11:29 PM, "Jonathan Greenberg" <greenberg at ucdavis.edu> wrote:
> Use the overlap region to pick PIFs (pseudoinvariant features), run a
> regression between the band values of the PIFs between one image and the
> other, apply the regression coefficients, and voila! If you just assume
> the entire overlap region is fine (no clouds or changed pixels), and
> they are orthorectified to one another, then you can extract the entire
> overlap region and run the regression on all those pixels.
> The other way is to calculate the mean and stdev of the band values, and
> adjust them that way, but I always felt the regression approach is a
> little more straightforward.
> There's a few automated algorithms out there to do this -- anyone want
> to write some code for it :) ?
> Canty's got some IDL code to do radiometric normalization that can be
> downloaded -- IDL's an easy language to read, so the code should be easy
> to port to something GRASS could use:
> Michael Barton wrote:
>> On 5/20/08 8:24 PM, "grass-user-request at lists.osgeo.org"
>> <grass-user-request at lists.osgeo.org> wrote:
>>> Date: Tue, 20 May 2008 11:44:51 -0700
>>> From: Jonathan Greenberg <greenberg at ucdavis.edu>
>>> Subject: Re: [GRASS-user] value differences between landsat images
>>> To: Juan Manuel Barreneche <jumanbar at gmail.com>
>>> Cc: grass-user at lists.osgeo.org
>>> Message-ID: <48331C23.8070705 at ucdavis.edu>
>>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>> It just means your images aren't radiometrically normalized to one
>>> another. If you correctly normalize them you won't see a line in the
>> I'll bite. How do you radiometrically normalize adjacent Landsat images. I'd
>> love to get rid of the lines.
>> Michael Barton, Professor of Anthropology
>> Director of Graduate Studies
>> School of Human Evolution & Social Change
>> Center for Social Dynamics & Complexity
>> Arizona State University
>> phone: 480-965-6213
>> fax: 480-965-7671
>> www: http://www.public.asu.edu/~cmbarton
>> grass-user mailing list
>> grass-user at lists.osgeo.org
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University
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