If anyone could help... I have many air photos that were scanned in as tif
files that were imported into GRASS as raster files. The problem is that
the north end of the photos were not orientated to the top of the map or
in this case, the top of the screen. The plan is to geo-reference these
images to UTM coords and to rectify the images. I have not been able to
find a program within GRASS that would allow me to rotate these images.
Does such a program exist? Or do the photos need to be scanned in with
north orientated to the top of the screen?Any comments would be appreciated. Thanks.
**********************************************************
* My Address *
* *
* DAVE BARNES *
* Geology Dept. *
* Western Michigan University *
* Kalamazoo, MI 49008 *
* *
* email address *
* *
* barnesd@lab.cc.wmich.edu *
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Hello,
If you have two geographical referenced points in the picture, you can
calculate the transformation (rotation,translation, scaling X and Y) of your
picture. Before the use of r.in.sunrast, let rotate and scale the picture
and bring the new image coordinate of your two points.Next, you can
incorporate the new image in GRASS. The last operation is to edit the header
of your GRASS raster to modify the insertion point ( in the cellhd directory ).
jean PROU
CREMA
B.P.5
17137 L'HOUMEAU
FRANCE
TEL : 46 50 94 40
FAX : 46 50 91 60
e.mail : jean.prou@ifremer.fr