QGIS algorithm - Fuzzify raster (large membership)

Source: R/qgis_fuzzifyrasterlargemembership.R

QGIS Algorithm provided by QGIS (native c++) Fuzzify raster (large membership) (native:fuzzifyrasterlargemembership). The Fuzzify raster (large membership) algorithm transforms an input raster to a fuzzified raster and thereby assigns values between 0 and 1 following the 'large' fuzzy membership function. The value of 0 implies no membership with the defined fuzzy set, a value of 1 depicts full membership. In between, the degree of membership of raster values follows the 'large' membership function. The 'large' function is constructed using two user-defined input raster values which set the point of half membership (midpoint, results to 0.5) and a predefined function spread which controls the function uptake. This function is typically used when larger input raster values should become members of the fuzzy set more easily than smaller values.

qgis_fuzzifyrasterlargemembership(
  INPUT = qgisprocess:::qgis_default_value(),
  BAND = qgisprocess:::qgis_default_value(),
  FUZZYMIDPOINT = qgisprocess:::qgis_default_value(),
  FUZZYSPREAD = qgisprocess:::qgis_default_value(),
  CREATE_OPTIONS = qgisprocess:::qgis_default_value(),
  OUTPUT = qgisprocess:::qgis_default_value(),
  ...,
  .complete_output = .complete_output_option(),
  .quiet = .quiet_option(),
  .messages = .message_option()
)

Arguments

INPUT

raster - Input Raster. Path to a raster layer.

BAND

band - Band Number. Integer value representing an existing raster band number.

FUZZYMIDPOINT

number - Function midpoint. 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.

FUZZYSPREAD

number - Function spread. 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.

CREATE_OPTIONS

string - Creation options. String 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

rasterDestination - Fuzzified raster. Path for new raster layer.

...

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

  • CRS_AUTHID - outputString - CRS authority identifier

  • EXTENT - outputString - Extent

  • HEIGHT_IN_PIXELS - outputNumber - Height in pixels

  • OUTPUT - outputRaster - Fuzzified raster

  • TOTAL_PIXEL_COUNT - outputNumber - Total pixel count

  • WIDTH_IN_PIXELS - outputNumber - Width in pixels