DFDUP filter

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

  

 0

 0

 0

 0

-1

 0

 0

 0

 8

 0

 0

 0

 0

 0

 0

 0

-8

 0

 0

 0

 1

 0

 0

 0

 0

  

Gain factor = 1/12 = 0.0833333

When using the DFDUP filter on a DEM:

See also: