rsaga.local.morphometry: Local Morphometry

In debangs/RSAGA: SAGA Geoprocessing and Terrain Analysis in R

Description

Calculates local morphometric terrain attributes (i.e. slope, aspect and curvatures). Intended for use with SAGA versions 2.1.0 and older. Use rsaga.slope.asp.curv for SAGA 2.1.1+

Usage

rsaga.local.morphometry(in.dem, out.slope, out.aspect, out.curv, out.hcurv,
  out.vcurv, method = "poly2zevenbergen", env = rsaga.env(), ...)

rsaga.slope(in.dem, out.slope, method = "poly2zevenbergen",
  env = rsaga.env(), ...)

rsaga.aspect(in.dem, out.aspect, method = "poly2zevenbergen",
  env = rsaga.env(), ...)

rsaga.curvature(in.dem, out.curv, method = "poly2zevenbergen",
  env = rsaga.env(), ...)

rsaga.plan.curvature(in.dem, out.hcurv, method = "poly2zevenbergen",
  env = rsaga.env(), ...)

rsaga.profile.curvature(in.dem, out.vcurv, method = "poly2zevenbergen",
  env = rsaga.env(), ...)

Arguments

in.dem	input: digital elevation model (DEM) as SAGA grid file (default file extension: .sgrd)
out.slope	optional output: slope (in radians)
out.aspect	optional output: aspect (in radians; north=0, clockwise angles)
out.curv	optional output: curvature
out.hcurv	optional output: horizontal curvature (plan curvature)
out.vcurv	optional output: vertical curvature (profile curvature)
method	character (or numeric): algorithm (see References): [0] Maximum Slope - Travis et al. (1975) ("maxslope", or 0) [1] Max. Triangle Slope - Tarboton (1997) ("maxtriangleslope", or 1) [2] Least Squares Fit Plane - Costa-Cabral and Burgess (1996) ("lsqfitplane", or 2) [3] Fit 2nd Degree Polynomial - Bauer et al. (1985) ("poly2bauer", or 3) [4] Fit 2nd Degree Polynomial - Heerdegen and Beran (1982) ("poly2heerdegen", or 4) [5] default: Fit 2nd Degree Polynomial - Zevenbergen and Thorne (1987) ("poly2zevenbergen", or 5) [6] Fit 3rd Degree Polynomial - Haralick (1983) ("poly3haralick", or 6).
env	list, setting up a SAGA geoprocessing environment as created by rsaga.env
...	further arguments to rsaga.geoprocessor

Value

The type of object returned depends on the intern argument passed to the rsaga.geoprocessor. For intern=FALSE it is a numerical error code (0: success), or otherwise (default) a character vector with the module's console output.

Author(s)

Alexander Brenning and Donovan Bangs (R interface), Olaf Conrad (SAGA module)

References

For references and algorithm changes in SAGA GIS 2.1.1+ see rsaga.slope.asp.curv.

See Also

rsaga.slope.asp.curv, rsaga.parallel.processing, rsaga.geoprocessor, rsaga.env

Examples

## Not run: 
# a simple slope algorithm:
rsaga.slope("lican.sgrd","slope","maxslope")
# same for ASCII grids (default extension .asc):
rsaga.esri.wrapper(rsaga.slope,in.dem="lican",out.slope="slope",method="maxslope")

## End(Not run)

debangs/RSAGA documentation built on May 15, 2019, 1:53 a.m.