QGIS algorithm - Fuzzify raster (near membership)

Source: R/qgis_fuzzifyrasternearmembership.R

QGIS Algorithm provided by QGIS (native c++) Fuzzify raster (near membership) (native:fuzzifyrasternearmembership). The Fuzzify raster (near membership) algorithm transforms an input raster to a fuzzified raster and thereby assigns values between 0 and 1 following the 'near' 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 'near' membership function. The 'near' function is constructed using two user-defined input values which set the midpoint of the 'near' function (midpoint, results to 1) and a predefined function spread which controls the function spread. This function is typically used when a certain range of raster values near a predefined function midpoint should become members of the fuzzy set. The function generally shows a higher rate of decay than the gaussian membership function.

qgis_fuzzifyrasternearmembership(
  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