DFDDN filter

The DFDDN filter is standard a linear filter which works in a 5 by 5 environment. It calculates the first derivative in the downward diagonal direction (df/downward diagonal). The values in the matrix are:

  

 1

 0

 0

 0

 0

 0

-8

 0

 0

 0

 0

 0

 0

 0

 0 

 0

 0

 0

 8

 0

 0

 0

 0

 0

-1

  

Gain factor = 1/12 = 0.0833333

When using the DFDDN filter on a DEM:

See also: