When I download DEMs for a diagonal section of coastline, I am forced to download a rectangular area, which leaves gigabytes of unused data. I want to delete the DEM files for the areas I don't need.
After building my map in QGIS, by importing ASC files as raster layers, is there a way to draw a selection, and remove all layers within that selection or another quick way to delete unwanted DEMs/ASC files?
This describes how to select features within a layer for deletion. My goal is to select layers on the map for deletion.