QGIS algorithm - Upslope and downslope curvature

Source: R/sagang_upslopeanddownslopecurvature.R

QGIS Algorithm provided by SAGA Next Gen Upslope and downslope curvature (sagang:upslopeanddownslopecurvature). ---------------- Arguments ---------------- DEM: Elevation Argument type: raster Acceptable values: - Path to a raster layer C_LOCAL: Local Curvature Argument type: rasterDestination Acceptable values: - Path for new raster layer C_UP: Upslope Curvature Argument type: rasterDestination Acceptable values: - Path for new raster layer C_UP_LOCAL: Local Upslope Curvature Argument type: rasterDestination Acceptable values: - Path for new raster layer C_DOWN: Downslope Curvature Argument type: rasterDestination Acceptable values: - Path for new raster layer C_DOWN_LOCAL: Local Downslope Curvature Argument type: rasterDestination Acceptable values: - Path for new raster layer WEIGHTING: Upslope Weighting Default value: 0.5 Argument type: number Acceptable values: - A numeric value - field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field - expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression

sagang_upslopeanddownslopecurvature(
  DEM = qgisprocess:::qgis_default_value(),
  C_LOCAL = qgisprocess:::qgis_default_value(),
  C_UP = qgisprocess:::qgis_default_value(),
  C_UP_LOCAL = qgisprocess:::qgis_default_value(),
  C_DOWN = qgisprocess:::qgis_default_value(),
  C_DOWN_LOCAL = qgisprocess:::qgis_default_value(),
  WEIGHTING = qgisprocess:::qgis_default_value(),
  ...,
  .complete_output = .complete_output_option(),
  .quiet = .quiet_option(),
  .messages = .message_option()
)

Arguments

DEM

raster - Elevation. Path to a raster layer.

C_LOCAL

rasterDestination - Local Curvature. Path for new raster layer.

C_UP

rasterDestination - Upslope Curvature. Path for new raster layer.

C_UP_LOCAL

rasterDestination - Local Upslope Curvature. Path for new raster layer.

C_DOWN

rasterDestination - Downslope Curvature. Path for new raster layer.

C_DOWN_LOCAL

rasterDestination - Local Downslope Curvature. Path for new raster layer.

WEIGHTING

number - Upslope Weighting. A numeric value. field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field. expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression.

...

further parameters passed to qgisprocess::qgis_run_algorithm()

.complete_output

logical specifying if complete out of qgisprocess::qgis_run_algorithm() should be used (TRUE) or first output (most likely the main) should read (FALSE). Default value is TRUE.

.quiet

logical specifying if parameter .quiet for qgisprocess::qgis_run_algorithm() Default value is TRUE.

.messages

logical specifying if messages from qgisprocess::qgis_run_algorithm() should be printed (TRUE) or not (FALSE). Default value is FALSE.

Details

Outputs description

  • C_DOWN - outputRaster - Downslope Curvature

  • C_DOWN_LOCAL - outputRaster - Local Downslope Curvature

  • C_LOCAL - outputRaster - Local Curvature

  • C_UP - outputRaster - Upslope Curvature

  • C_UP_LOCAL - outputRaster - Local Upslope Curvature