I was given a bunch of ASCII files that I needed to convert to raster and then create maps from. For some maps I had to do a simple difference calculation between two rasters (did this in ArcMap).
Well, after I had created dozens of these maps I realized the rasters didn't have a spatial reference. The ASCII files all contain the same spatial extent in lat/lon and same cell size in degrees. I thought to avoid any potential problems that may be caused by the lack of spatial reference, I would define the projection as WGS 84.
Would the lack of spatial reference have caused any problems when I did the difference calculations? I tried calculating the difference for a couple of sample files with and without a spatial reference and found no difference so I assume I can just add the spatial reference to my difference rasters that don't have a spatial reference instead of redoing them all.
Is this correct?