I need to create a new raster layer with cumulative values for 16 raster layers. For context, each raster layer represents an 'areas burnt' in a given year - essentially, I want a new layer that tells me how many times each area has been burnt using a colour e.g. white is never burnt, light yellow is burnt once, darker yellow burnt twice… etc.)
I have been told I can use the raster calculator to do this, however when I add the layers together I am (unsurprisingly) left with a raster that only covers where each raster layer overlaps. Is there a way to get around this?
I actually also have a polygon layer for each raster layer, in case someone has a solution using the polygons. I converted the polygons to raster because the polygons are quite complicated, and I was told this would make it tricky. Screenshot of a section of the polygons below for context: