I’m trying to create contours from a raster layer in QGIS. On my first attempt, I cropped my raster layer in Photoshop and reimported it, but it lost coordinate data I think. I made the contours successfully and they were beautiful, but mirrored upwards from the raster layer.
The scale is way out. I discovered this when I imported some vector data. A distance that should be 0.04 degrees is now 30 degrees. This probably is why I’m having my next problem:
I eventually figured out a method for cropping the raster layer in QGIS so it’s at the right scale and location. However, when I make contours from this raster they appear square and pixellated, like they follow the pixel boundaries of the raster layer.
The pixel data for the two raters I used looks the same, so why is this one at the smaller scale now looking so different? Any idea how I can get the nice smooth contours that I got on my first attempt (albeit at the wrong scale)?
I’m very new to this, so I may be missing obvious things! I’d appreciate any help.