DTM — Flow direction — D_infinite method

RASTER type data (ESRI GRID format), consisting of square cells of 10 m side.The flow direction expresses the direction towards which the surface water flow flows from the cell in question, assuming the waterproof side. In this case the calculation method used is the D-Infinite (Dinf. of Tarboton, 1997), according to which, unlike other methods such as D8 (see flow_dir_d8), there are infinite possible flow directions, corresponding to any direction within the 360° range. The D-Infinite (Dinf. of Tarboton, 1997) is one of the most accredited among the so-called “Flow Tracking” methods. It is able to model not only the accumulation of flow in concave areas but also its dispersion in convex areas. The resulting flow accumulation form is therefore much more “natural” and less angular than that obtained with the D8 method (the only so far the basic content in ArcView/ArcGIS). Moreover, it is not significantly affected by the orientation of the DEM on the territory (if any rotations of the grid cause slight variations in the result). The unit of measurement is [°sessag.].