Fig. 1
From: TWI computation: a comparison of different open source GISs

TWI scheme Scheme of the TWI: a Flow accumulation area, b Flow direction and the corresponding flow width for a DEM cell, c Tangent of the slope angle
From: TWI computation: a comparison of different open source GISs
TWI scheme Scheme of the TWI: a Flow accumulation area, b Flow direction and the corresponding flow width for a DEM cell, c Tangent of the slope angle