I am curious about the algorithm of Flow Direction in ArcGIS. Recently I am studying about Hidrology, and I have some questions regard to Flow Direction in GIS.
The size of this cell is 100m x 100m, with the radius of 10km for the raster data model. I have used the Flow Direction. The result showed that the value of one circle is 1. I am curious about this result.
- Since the value of the circle is same, how the Flow Direction result could came out like that?
what kind of logarithm is that? I have tried to find the answer in here: (http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z00000052000000.htm). But I still cannot understand. Would you explain it to me?
Using DEM, finally i got this value. But my question is : what kind of Flow Direction is this? (West? or South)
Beside of the raster data model, I have also made he square and hexagonal Flow Direction model as you can see below.
I hope you can help me to figure out my question.