I’m on 3.16 QGIS GRASS... It hasn’t got gdalwarp.
Simple issue, I have a raster file which includes two regions: land and sea. I have a vector polyline that marks the division between land and sea. I want to keep the sea element of the raster, and cut, mask, bounded out, loose or otherwise not see the land element.
Seems I have to turn the polyline into a polygon first? (Or drop to MS paint, manually trace, re geo reference, and reload with sellotape and tippex ..)?