[GRASSLIST:5078] Re: image alignment

Camilo Castiblanco camilocast at tutopia.com
Mon Nov 25 22:47:58 EST 2002

First you need that all images have the same region and area
You can do it with r.resample

Then, you can use the i.group command.
You create a group with the set of images and use i.rectify for the group.
Furthermore you need the i.target command


----- Original Message -----
From: "Mike Sears" <msears at mama.indstate.edu>
To: <GRASSLIST at baylor.edu>
Sent: Monday, November 25, 2002 7:55 PM
Subject: [GRASSLIST:5063] image alignment

> I have a set of images, all of which are relatively of the same area,
> the images are all slightly offset.  I need to either align all of the
> to a reference image or or be able to batch process the images to a set of
> known ground coordinates.
> Within each image, there are markers that have known xy coordinates.  I
> understand that I could use i.points and i.rectify for each individual
> That would take quite a while as I have hundreds of images.
> Is there a way to automatically align(and in some cases rescale) the
> automatically or in some batch process, or am I stuck with rectifying each
> individual image?...or is there a better way to do  this task altoghether?
> Thanks in advance,
> Mike
> --
> Michael W. Sears, Ph.D.
> Department of Life Science
> Indiana State University
> Terre Haute, IN 47809
> 812-237-9638

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