qgis_greaterthanfrequency: QGIS algorithm - Greater than frequency

In JanCaha/r_package_qgis: An extension of package "qgisprocess" providing direct R functions for QGIS functions

QGIS algorithm - Greater than frequency

Description

QGIS Algorithm provided by QGIS (native c++) Greater than frequency (native:greaterthanfrequency). The Greater than frequency algorithm evaluates on a cell-by-cell basis the frequency (number of times) the values of an input stack of rasters are greater than the value of a value raster. If multiband rasters are used in the data raster stack, the algorithm will always perform the analysis on the first band of the rasters - use GDAL to use other bands in the analysis. The input value layer serves as reference layer for the sample layers. Any NoData cells in the value raster or the data layer stack will result in a NoData cell in the output raster if the ignore NoData parameter is not checked. The output NoData value can be set manually. The output rasters extent and resolution is defined by the input raster layer and is always of int32 type.

Usage

qgis_greaterthanfrequency(
  INPUT_VALUE_RASTER = qgisprocess:::qgis_default_value(),
  INPUT_VALUE_RASTER_BAND = qgisprocess:::qgis_default_value(),
  INPUT_RASTERS = qgisprocess:::qgis_default_value(),
  IGNORE_NODATA = qgisprocess:::qgis_default_value(),
  OUTPUT_NODATA_VALUE = 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_VALUE_RASTER	raster - Input value raster. Path to a raster layer.
INPUT_VALUE_RASTER_BAND	band - Value raster band. Integer value representing an existing raster band number.
INPUT_RASTERS	multilayer - Input raster layers. .
IGNORE_NODATA	boolean - Ignore NoData values. 1 for true/yes. 0 for false/no. 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_NODATA_VALUE	number - Output NoData value. 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 - Output layer. 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

• FOUND_LOCATIONS_COUNT - outputNumber - Count of cells with equal value occurrences

• HEIGHT_IN_PIXELS - outputNumber - Height in pixels

• MEAN_FREQUENCY_PER_LOCATION - outputNumber - Mean frequency at valid cell locations

• OCCURRENCE_COUNT - outputNumber - Count of value occurrences

• OUTPUT - outputRaster - Output layer

• TOTAL_PIXEL_COUNT - outputNumber - Total pixel count

• WIDTH_IN_PIXELS - outputNumber - Width in pixels

JanCaha/r_package_qgis documentation built on Nov. 3, 2024, 5:25 p.m.