[GRASS-dev] image rectification from command line only ?

[Michael Barton]

On Mar 4, 2008, at 10:00 AM, grass-dev-request at lists.osgeo.org wrote:

> Date: Tue, 4 Mar 2008 17:04:27 +0100
> From: "Nicolas MERLET" <admin at merletn.org>
> Subject: [GRASS-dev] image rectification from command line only ?
> To: <grass-dev at lists.osgeo.org>
> Message-ID: <018801c87e11$6d0d9690$6642000a at NICOLAS>
> Content-Type: text/plain;	charset="us-ascii"
>
>
> hi all,
>
> i need to rectify an image automatically (i assume using i.points and
> i.rectify). as far as i've been able to see, i.points is to use in  
> graphical
> monitor mode ? so does anyone know how to use it from the command  
> line (and
> only from the command line) ?
>
> thanks for helping...
>
> nicolas

i.points lets a user interactively set ground control points (GCPs)  
for an unrectified image, using a rectified image. This particular  
process cannot be automated since it is interactive by definition.

However, if you already know the ground coordinates of a set of xy  
points for an image, you can build a POINTS file and i.rectify will  
georectify the image from the command line.

Michael