
have a look at:

Jones KH (1998) A comparison of algorithms used to compute hill slope as
a property of the DEM. Computers and Geosciences. 24 (4): 315-323.

http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?topicname=how_slope_works

http://forums.esri.com/Thread.asp?c=93&f=1734&t=239914

s.

On 02/09/2011 01:14 PM, Cavazzi, Stefano wrote:
> Hi All,
>
> I am using  RSAGA for the first time trying to extract some land surface parameters with "ta_morphometry"  and wondering which method is used by ArcGIS to calculate slope, aspect, curvature, ...
>
> Methods:
>                 [0] Maximum Slope (Travis et al. 1975)
>                 [1] Maximum Triangle Slope (Tarboton 1997)
>                 [2] Least Squares Fitted Plane (Horn 1981, Costa-Cabral & Burgess 1996)
>                 [3] Fit 2.Degree Polynom (Bauer, Rohdenburg, Bork 1985)
>                 [4] Fit 2.Degree Polynom (Heerdegen & Beran 1982)
>                 [5] Fit 2.Degree Polynom (Zevenbergen & Thorne 1987)
>                 [6] Fit 3.Degree Polynom (Haralick 1983)
>
> Which one would suit best a gridded DEM created by spline interpolation (I'm using [5])?
>
> Thanks,
> Stefano
>
> Stefano Cavazzi
> PhD Student, National Soil Resources Institute
> School Of Applied Sciences, Cranfield University
>
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>
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