[GRASSLIST:9558] Re: rectifying images

[Michael Barton]

You are right.

However, if you can somehow come up with a set of GCP's in another way you
can just drop them in the points directory that i.points makes (It ONLY
makes GCP's) then run i.rectify. For example, when I moved a bunch of
aerials into GRASS last year that I "rectified" with MapInfo many years
back, I was able to simply take the text GCP files from MapInfo, reformat
them for GRASS (this took some trial and error), drop them into the points
directory, and run i.rectify.

You can also use gdal_warp if you have a file of GCP's.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
Arizona State University
Tempe, AZ 85287-2402

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton



> From: Wolfgang Zillig <wolfgang.zillig at web.de>
> Date: Fri, 16 Dec 2005 15:13:03 +0100
> To: grasslist-en <GRASSLIST at baylor.edu>
> Subject: [GRASSLIST:9545] Re: rectifying images
> 
> I'm not sure if this helps for my problem (perhaps I was not clear
> enough in my description). The problem is, that I have one original
> images which I want to use as reference and all others are more or less
> deformed but no one at the same level. So I think I will have mark my
> reference points in all deformed images. When I understand right
> grouping is good, when you have many images whith the same deformation,
> or am I wrong?
> 
> Wolfgang
> 
> Hamish schrieb:
> 
>>> I need to rectify several images in the next time. Is there a way to
>>> automatize this procedure a little bit? I have the "original" image and
>>> then about 10 to 20 images which needs to be corrected that they refer
>>> to the original one. I thought of something like saving the correction
>>> points of the original image to an file, so that I don't need to mark
>>> again (the reference points will be the same for all images) and I only
>>> need to specify them in the images which needs to be rectified.
>>>    
>>> 
>> 
>> 
>> Add all the images to a group, then rectify the lot.
>> 
>> i.group input=name[,name,...]
>> 
>> i.rectify -a
>> 
>> 
>> 
>> Hamish
>> 
>> 
>>  
>>