I have an 8 km by 8 km raster of 20 m/pixel terrain data. The georeference data has been lost. All I know is that it's within 100 km of Smithers, BC. I realize that this might involve some very heavy raster processing, but - is there any way I could find the location by matching against existing DEM/CDED rasters in the area?
You could manually georeference to another existing DEM product (SRTM maybe, but resolution disparity would be huge). Having said that, you are better off trying to get the georeferencing info from somewhere as DEM to DEM registration when the DEMs have different resolutions is super hard. Perhaps contact the person(s) who created the original data?