Dear all,

I am struggling with the calculation of direction cosine matrix.

My goal is to get eigenvalue for each cell using 3 by 3 window.

eigenvalue will be calculated from the direction cosine matrix. Unfortunately I am good at this kind of stuff.

Please give me a any little tiny of idea for this.

you may see (McKean and Roering, 2004, Geomorphology 57, 331-351) for more clear understanding (I attached part of it because of the amount limit).

Thank you in advance

I am struggling with the calculation of direction cosine matrix.

My goal is to get eigenvalue for each cell using 3 by 3 window.

eigenvalue will be calculated from the direction cosine matrix. Unfortunately I am good at this kind of stuff.

Please give me a any little tiny of idea for this.

you may see (McKean and Roering, 2004, Geomorphology 57, 331-351) for more clear understanding (I attached part of it because of the amount limit).

Thank you in advance

Thank you for your comment. Unfortunately I am new to some programming in ARCGIS. so I couldn't understand what you recommended. Especially, these parts;

(2) From those, compute the three "directional cosine" grids.

(3) Compute the six squares and products of those three grids.

(5) Construct the coefficients of the characteristic polynomial from T: these are somewhat involved by straightforward algebraic combinations of the coefficients of T.

and what is name of other programs which enable this process efficiently?

I am sorry to bothering you and thank you again for your kind response.

Tai-Hoon