Tool Slope, Aspect, Curvature

Calculates the local morphometric terrain parameters slope, aspect and if supported by the chosen method also the curvature. Besides tangential curvature also its horizontal and vertical components (i.e. plan and profile curvature) can be calculated.

References

• Bauer, J., Rohdenburg, H., Bork, H.-R. (1985): Ein Digitales Reliefmodell als Vorraussetzung fuer ein deterministisches Modell der Wasser- und Stoff-Fluesse. In: Bork, H.-R., Rohdenburg, H. [Eds.]: Parameteraufbereitung fuer deterministische Gebietswassermodelle, Grundlagenarbeiten zur Analyse von Agrar-Oekosystemen, Landschaftsgenese und Landschaftsoekologie, H.10, p.1-15.
• 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. doi:10.1029/93WR03512.
• 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.
• Florinsky, I.V. (2009): Computation of the third?order partial derivatives from a digital elevation model. International Journal of Geographical Information Science, 23(2), p.213-231. doi:10.1080/13658810802527499.
• Haralick, R.M. (1983): Ridge and valley detection on digital images. Computer Vision, Graphics and Image Processing, Vol.22, No.1, p.28-38.https://doi.org/10.1016/0734-189X(83)90094-4 doi:10.1016/0734-189X(83)90094-4.
• Heerdegen, R.G., Beran, M.A. (1982): Quantifying source areas through land surface curvature. Journal of Hydrology, Vol.57. doi:10.1016/0022-1694(82)90155-X.
• Horn, B. K. (1981): Hill shading and the relectance map. Proceedings of the IEEE, v. 69, no. 1, p.14-47. doi:10.1109/PROC.1981.11918.
• Olaya, V. (2006): Basic Land-Surface Parameters. In: Hengl, T., Reuter, H.I. [Eds.]: Geomorphometry: Concepts, Software, Applications. Developments in Soil Science, Elsevier, Vol.33, 141-169. doi:10.1016/S0166-2481(08)00006-8.
• Tarboton, D.G. (1997): A new method for the determination of flow directions and upslope areas in grid digital elevation models. Water Resources Research, Vol.33, No.2, p.309-319.
• 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.
• Zevenbergen, L.W., Thorne, C.R. (1987): Quantitative analysis of land surface topography. Earth Surface Processes and Landforms, 12: 47-56. doi:10.1002/esp.3290120107.

• Author: O.Conrad (c) 2001
• Menu: Terrain Analysis|Morphometry

Parameters

Command-line

Usage: saga_cmd ta_morphometry 0 [-ELEVATION <str>] [-SLOPE <str>] [-ASPECT <str>] [-C_GENE <str>] [-C_PROF <str>] [-C_PLAN <str>] [-C_TANG <str>] [-C_LONG <str>] [-C_CROS <str>] [-C_MINI <str>] [-C_MAXI <str>] [-C_TOTA <str>] [-C_ROTO <str>] [-METHOD <str>] [-UNIT_SLOPE <str>] [-UNIT_ASPECT <str>]
  -ELEVATION:<str>  	Elevation
	Grid, input
  -SLOPE:<str>      	Slope
	Grid, output
  -ASPECT:<str>     	Aspect
	Grid, output
  -C_GENE:<str>     	General Curvature
	Grid, output, optional
  -C_PROF:<str>     	Profile Curvature
	Grid, output, optional
  -C_PLAN:<str>     	Plan Curvature
	Grid, output, optional
  -C_TANG:<str>     	Tangential Curvature
	Grid, output, optional
  -C_LONG:<str>     	Longitudinal Curvature
	Grid, output, optional
  -C_CROS:<str>     	Cross-Sectional Curvature
	Grid, output, optional
  -C_MINI:<str>     	Minimal Curvature
	Grid, output, optional
  -C_MAXI:<str>     	Maximal Curvature
	Grid, output, optional
  -C_TOTA:<str>     	Total Curvature
	Grid, output, optional
  -C_ROTO:<str>     	Flow Line Curvature
	Grid, output, optional
  -METHOD:<str>     	Method
	Choice
	Available Choices:
	[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] 6 parameter 2nd order polynom (Evans 1979)
	[4] 6 parameter 2nd order polynom (Heerdegen & Beran 1982)
	[5] 6 parameter 2nd order polynom (Bauer, Rohdenburg, Bork 1985)
	[6] 9 parameter 2nd order polynom (Zevenbergen & Thorne 1987)
	[7] 10 parameter 3rd order polynom (Haralick 1983)
	[8] 10 parameter 3rd order polynom (Florinsky 2009)
	Default: 6
  -UNIT_SLOPE:<str> 	Unit
	Choice
	Available Choices:
	[0] radians
	[1] degree
	[2] percent rise
	Default: 0
  -UNIT_ASPECT:<str>	Unit
	Choice
	Available Choices:
	[0] radians
	[1] degree
	Default: 0