[GRASS-user] Georrectification using points

GRASS GRASS user
,
1

Luisa wrote:

I have a few very-high resolution images that I need to
georrectify in GRASS. Outside GRASS I created a text file with
GCP position in the image and its real-coordinates.
I have read this: http://grass.osgeo.org/wiki/Georeferencing
I tried to use i.rectify but I didn't see no place to
define/add GCP's. And the manual is not clear regarding where
to insert the points... Can anyone help me?

you can add to the POINTS file manually (create some dummy test,
points to see the simple text file format), or maybe more easily
use gdal_translate to add the GCPs to a geotiff then import
that.

Hamish

2

you can add to the POINTS file manually (create some dummy test,
points to see the simple text file format), or maybe more easily
use gdal_translate to add the GCPs to a geotiff then import
that.

Uhm my question is how can I create a Points file that is added to the group?

Regarding http://grass.osgeo.org/wiki/Georeferencing:
What is the difference between NEW WAY and EXTRA NEW WAY ? Aren’t they the same?

Luisa