Does anyone know what type of algorithm is used in the ArcGIS Watershed tool (in the Spatial Analyst package)?
Very little information given on Esri's website ... but I suspect it may be some kind of depth/breadth search.
I've looked at these ArcGIS Online Help pages:
So yes, it uses the flow direction raster, but what algorithm is it using to traverse the raster?
Please note, I'm not looking for answers along the lines of 'it uses D8..'...D8 is not really an algorithm, but a model to help define the algorithm you would use. I.E you could implement the D8 scheme within a depth-first search algorithm and/or a breadth-first search algorithm
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