Slope, Aspect, Curvature
- Author: O.Conrad (c) 2001
- Menu: Terrain Analysis | Morphometry
Description
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.
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Elevation | grid, input | ELEVATION | - | - |
| Output | Slope | grid, output | SLOPE | - | - |
| Aspect | grid, output | ASPECT | - | - |
| General Curvature | grid, output, optional | C_GENE | - | - |
| Profile Curvature | grid, output, optional | C_PROF | - | - |
| Plan Curvature | grid, output, optional | C_PLAN | - | - |
| Tangential Curvature | grid, output, optional | C_TANG | - | - |
| Longitudinal Curvature | grid, output, optional | C_LONG | Zevenbergen & Thorne (1987) refer to this as profile curvature | - |
| Cross-Sectional Curvature | grid, output, optional | C_CROS | Zevenbergen & Thorne (1987) refer to this as plan curvature | - |
| Minimal Curvature | grid, output, optional | C_MINI | - | - |
| Maximal Curvature | grid, output, optional | C_MAXI | - | - |
| Total Curvature | grid, output, optional | C_TOTA | - | - |
| Flow Line Curvature | grid, output, optional | C_ROTO | - | - |
| Options | Grid System | grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Method | choice | METHOD | - | 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 | choice | UNIT_SLOPE | - | Available Choices:
[0] radians
[1] degree
[2] percent rise
Default: 0 |
| Unit | choice | UNIT_ASPECT | - | Available Choices:
[0] radians
[1] degree
Default: 0 |
Command Line
Usage: saga_cmd ta_morphometry 0 [-ELEVATION ] [-SLOPE ] [-ASPECT ] [-C_GENE ] [-C_PROF ] [-C_PLAN ] [-C_TANG ] [-C_LONG ] [-C_CROS ] [-C_MINI ] [-C_MAXI ] [-C_TOTA ] [-C_ROTO ] [-METHOD ] [-UNIT_SLOPE ] [-UNIT_ASPECT ]
-ELEVATION: Elevation
grid, input
-SLOPE: Slope
grid, output
-ASPECT: Aspect
grid, output
-C_GENE: General Curvature
grid, output, optional
-C_PROF: Profile Curvature
grid, output, optional
-C_PLAN: Plan Curvature
grid, output, optional
-C_TANG: Tangential Curvature
grid, output, optional
-C_LONG: Longitudinal Curvature
grid, output, optional
-C_CROS: Cross-Sectional Curvature
grid, output, optional
-C_MINI: Minimal Curvature
grid, output, optional
-C_MAXI: Maximal Curvature
grid, output, optional
-C_TOTA: Total Curvature
grid, output, optional
-C_ROTO: Flow Line Curvature
grid, output, optional
-METHOD: 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: Unit
choice
Available Choices:
[0] radians
[1] degree
[2] percent rise
Default: 0
-UNIT_ASPECT: Unit
choice
Available Choices:
[0] radians
[1] degree
Default: 0