On 13/12/2010 09:46, maning sambale wrote:
Worldfiles does not store CRS information. It simply provides you:
pixel units, rotation, x,y coordinate of the center of the upper left
pixel:
http://en.wikipedia.org/wiki/World_file
You need to set the coordinate system in the Layer Properties>
General> Specify CRS to view the raster in the proper CRS.
Furthermore, QGIS will ignore a world file for any raster
that's already geo-referenced in the header of the *.tif file.
The *.tfw is relevant only if the raster in *not* internally
georeferenced.
On Mon, Dec 13, 2010 at 3:37 PM, LeventB<[email protected]> wrote:
Hi there!
As i am writing a tutorial for open-source GIS, i want to make students
familiar with the world file connected to a *.tif. The goal is to
georeference a raster map by editing the *.tfw, which works well in ArcGIS.
There, i proceed in the following way:
1. Open the *.tfw with an editor
2. Adjust the coordinates
3. Save the *.tfw
4. Delete the *.aux file
5. Load the map to the canvas
Strangely, this procedure doesn't have any effect in QGIS. Even if i delete
every related file except from the *.tfw and the *.tif itself, the map will
display the same as before. I wonder where QGIS gets the coordinates?
Does anyone have an idea?
Thanks and have a nice week,
Levent
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