I'm a beginner with GIS software and I'm trying to get a raster greyscale heightmap from contour lines (read from a GeoPackage) in QGIS.
I'm using the Grid interpolation tools (menu Raster>Analysis>Grid (***)), and I'm faced with two issues:
It only seems to work from points vector layers and not lines (I'm not able to select a line layer in the dialog box).
If I use a point layer (for test purposes only), I cannot find how to specify the 'size' of pixels (which are way too big with the default settings).
Am I using the right tool? What am I missing?