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Yeah I have spatial analyst enabled. The map files I have in my folder use the following extensions:
Which combine to form the distributions map I can view in GIS software. Would this be considered 'point shape'? They don't show up when I search for an input for the density tool. I wouldn't exactly consider them points myself - they show a distribution area (for lack of a better way to describe it - blobs of varying shapes and sizes) rather than dots. It's where these areas overlap that I want to show hotspots.
OK, you've got a polygon shapefile (generally, shapefiles can be points, lines, or polygons). You can only use points or lines for Kernel Density, and obviously only points for Point Density. You should check out this thread though, there are a few ideas in there for dealing with polygons.
Ah right, thanks for the link, I'll check it out.
Edit- I had a look, and it seems the outcome for those methods is a one-colour heatmap like I achieved by just increasing transparency in qGIS, a much simpler method! Thanks anyway though, I guess I'll have to stick with what I have, but at least now I know there's not really a better way of doing it.
You can symbolize the polygons however you want (there's is a column with the count of overlapping polygons).