D2FDXDY filter

The D2FDXDY filter is standard a linear filter which works in a 5 by 5 environment. It calculates the second derivative in all diagonal directions (d2f/dxdy). The values in the matrix are:

  

 -1

  8

  0

 -8

  1

  8

-64

  0 

 64

 -8

  0

  0

  0

  0

  0

 -8

 64

  0

-64

  8

  1

 -8

  0 

  8

 -1

  

Gain factor = 1/144 = 0.0069444

When using the D2FDXDY filter on a DEM:

See also: