1

Using this algorithm in QGIS I can choose between 7 methods, the default one being by Zevenbergen & Thorne 1987. What's the difference between them and can I just use the default one without worrying about it?

3

The default method is the most used for general tasks, but you can choose the best one for your case by reading the related documentation (taken from SAGA-GIS Module Library Documentation (v2.1.3):

(0) Maximum Slope (Travis et al. 1975)

Travis, M.R., Elsner, G.H., Iverson, W.D., Johnson, C.G. (1975): 'VIEWIT: computation of seen areas, slope, and aspect for land-use planning', USDA F.S. Gen. Tech. Rep. PSW-11/1975, 70p. Berkeley, California, U.S.A.

(1) Maximum Triangle Slope (Tarboton 1997)

Tarboton, D.G. (1997): 'A new method for the determination of flow directions and upslope areas in grid digital elevation models', Water Ressources Research, Vol.33, No.2, p.309-319

(2) Least Squares Fitted Plane (Horn 1981, Costa-Cabral & Burgess 1996)

Horn, B. K. (1981): 'Hill shading and the relectance map', Proceedings of the IEEE, v. 69, no. 1, p. 14-47.

Beasley, D.B., Huggins, L.F. (1982): 'ANSWERS: User's manual', U.S. EPA-905/9-82-001, Chicago, IL. 54pp.

Costa-Cabral, M., Burges, S.J., (1994): 'Digital Elevation Model Networks (DEMON): a model of flow over hillslopes for computation of contributing and dispersal areas', Water Resources Research, v. 30, no. 6, p. 1681-1692.

(3) 6 parameter 2nd order polynom (Evans 1979)

Evans, I.S. (1979): 'An integrated system of terrain analysis and slope mapping', Final report on grant DA-ERO-591-73-G0040. University of Durham, England.

(4) 6 parameter 2nd order polynom (Heerdegen & Beran 1982)

Heerdegen, R.G., Beran, M.A. (1982): 'Quantifying source areas through land surface curvature', Journal of Hydrology, Vol.57

(5) 6 parameter 2nd order polynom (Bauer, Rohdenburg, Bork 1985)

Bauer, J., Rohdenburg, H., Bork, H.-R. (1985): 'Ein Digitales Reliefmodell als Vorraussetzung fuer ein deterministisches Modell der Wasser- und Stoff-Fluesse', Landschaftsgenese und Landschaftsoekologie, H.10, Parameteraufbereitung fuer deterministische Gebiets-Wassermodelle, Grundlagenarbeiten zu Analyse von Agrar-Oekosystemen, (Eds.: Bork, H.-R. / Rohdenburg, H.), p.1-15

(6) 9 parameter 2nd order polynom (Zevenbergen & Thorne 1987)

Zevenbergen, L.W., Thorne, C.R. (1987): 'Quantitative analysis of land surface topography', Earth Surface Processes and Landforms, 12: 47-56.

(7) 10 parameter 3rd order polynom (Haralick 1983)

R.M. Haralick (1983): 'Ridge and valley detection on digital images', Computer Vision, Graphics and Image Processing, Vol.22, No.1, p.28-38

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