QGIS algorithm - Downslope distance gradient

Source: R/sagang_downslopedistancegradient.R

QGIS Algorithm provided by SAGA Next Gen Downslope distance gradient (sagang:downslopedistancegradient). —————- Arguments —————- DEM: Elevation Argument type: raster Acceptable values: - Path to a raster layer GRADIENT: Gradient Argument type: rasterDestination Acceptable values: - Path for new raster layer DIFFERENCE: Gradient Difference Argument type: rasterDestination Acceptable values: - Path for new raster layer DISTANCE: Vertical Distance Default value: 10 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 OUTPUT: Output Default value: 2 Argument type: enum Available values: - 0: (0) distance - 1: (1) gradient (tangens) - 2: (2) gradient (degree) Acceptable values: - Number of selected option, e.g. '1' - Comma separated list of options, e.g. '1,3'

sagang_downslopedistancegradient(
  DEM = qgisprocess:::qgis_default_value(),
  GRADIENT = qgisprocess:::qgis_default_value(),
  DIFFERENCE = qgisprocess:::qgis_default_value(),
  DISTANCE = qgisprocess:::qgis_default_value(),
  OUTPUT = qgisprocess:::qgis_default_value(),
  ...,
  .complete_output = .complete_output_option(),
  .quiet = .quiet_option(),
  .messages = .message_option()
)

Arguments

DEM

raster - Elevation. Path to a raster layer.

GRADIENT

rasterDestination - Gradient. Path for new raster layer.

DIFFERENCE

rasterDestination - Gradient Difference. Path for new raster layer.

DISTANCE

number - Vertical Distance. 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.

OUTPUT

enum of ("(0) distance", "(1) gradient (tangens)", "(2) gradient (degree)") - Output. Number of selected option, e.g. '1'. Comma separated list of options, e.g. '1,3'.

...

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

  • DIFFERENCE - outputRaster - Gradient Difference

  • GRADIENT - outputRaster - Gradient