The range of values in my flow direction raster is 1-129.
D8 method was used.
I would expect 128 to be the largest value in accordance with the documentation
what's more I show values OTHER THAN 1, 2, 4, 8, 16, 32, 64, 128
Why are there these other values?
One answer to this question begins to suggest this is normal but does not really explain why/how other values could be produced. Flow Direction Raster Value Range