I'm not particularly well versed in GIS, so maybe the answer is obvious:
I have data provided in textfiles on an FTP server here. Each column corresponds to a value on a grid laid out over germany. Each cell in the grid has a size of 1 square kilometer and the projection used seems to be EPSG:31467.
If I check the projection here, it doesn't seem to cover the whole area covered by the data set provided. Why is that? How would I generate the correct vector grid (fishnet?) in QGIS to correlate it with the data?