I have a study area and 6 different DTMs for that area from different sources and I would like to know the percentage of pixels with the same value. I suppose I will have to extract some statistic and make some calculations in Excel, but I don't know what to extract and how to do it. If somebody knows some methods or something similar please give some indications.
One problem you will have is that the grids won't be lined up properly.
6 different grids with 6 different cell size, extent and numebr of cells, means that you not only have data differences, but also you have problems with the interpolation required to make them coincident.
But, once they're coincident, you could work our the standard deviation by using some map algebra, then do some summary statistics to work out how many have an SD > 0.