Calculating the difference between two rasters as a percentage (not a raster) value

Question

I am studying sand dune movements and have two sets of rasters for one area. After calculating the difference and multiplying by 100 to get a percent difference, I receive another raster set. Is there a way to present this data as a number value, so I can say for instance, the sand dunes changed xyz% during this time period?

Is there another way I am not thinking of to present this data, any suggestions would be appreciated, this is for a final project in a college class I am taking. Thanks in advance!

DanPatterson_Retired · Accepted Answer

As a single number? aren't you interested where the differences occurred? What is wrong with the absolute magnitude of volume change or showing areas of reduction and accumulation.  Percentages are often misused and I would avoid them unless they are accompanied by some tabular association with absolute values/magnitudes.