How do I crop a raster layer in QGIS?
I want to make contours from a section of a layer, and including the whole layer will create far more data than I need and slow down the rendering.
I have found that I can do it by using the Raster calculator and specifying a new layer extent, but how do I know what values to enter for the rows and columns?
I also tried cropping the geotiff in Photoshop, but it seemed to lose the coordinate data.
Is there any way to create contours from part of a raster layer without having to crop it first?