| Tool Name | Upslope and Downslope Curvature |
| Tool ID | 26 |
| Library ID | ta_morphometry |
| Version | 1.0 |
| Author(s) | P.Gandelli, O.Conrad (c) 2015 |
Please cite SAGA whenever you use it for your publications:
doi:10.5194/gmd-8-1991-2015
Description
This tool first calculates the local curvature of a cell as sum of the gradients (i.e. tangens of slope) to its neighbour cells. This is a simple estimation of the general curvature and is strongly correlated with general curvatures calculated with other methods (e.g. Zevenbergen & Thorne 1987). Then upslope curvature is calculated as the distance and flow proportional weighted average local curvature over a cell's upslope contributing area following the multiple flow direction algorithm after Freeman (1991). In a similar way the downslope curvature is calculated by summarizing the curvatures of all hydrologically downslope connected cells. The local upslope/downslope curvatures just take the immediately neighboured cells into account.
Parameters
| Name | Type | Identifier | Description | Constraints |
|---|
| Input |
|---|
| Elevation | grid, input | DEM | | |
| Output |
|---|
| Local Curvature | grid, output | C_LOCAL | | |
| Upslope Curvature | grid, output | C_UP | | |
| Local Upslope Curvature | grid, output | C_UP_LOCAL | | |
| Downslope Curvature | grid, output | C_DOWN | | |
| Local Downslope Curvature | grid, output | C_DOWN_LOCAL | | |
| Options |
|---|
| Upslope Weighting | floating point number | WEIGHTING | | Minimum: 0.000000
Maximum: 1.000000
Default: 0.5 |