gdal_contour_polygon: QGIS algorithm - Contour Polygons

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

QGIS algorithm - Contour Polygons

Description

QGIS Algorithm provided by GDAL Contour Polygons (gdal:contour_polygon). —————- Arguments —————- INPUT: Input layer Argument type: raster Acceptable values: - Path to a raster layer BAND: Band number Default value: 1 Argument type: band Acceptable values: - Integer value representing an existing raster band number INTERVAL: Interval between contour lines 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 CREATE_3D: Produce 3D vector Default value: false Argument type: boolean Acceptable 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 IGNORE_NODATA: Treat all raster values as valid Default value: false Argument type: boolean Acceptable 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 NODATA: Input pixel value to treat as NoData (optional) 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 OFFSET: Offset from zero relative to which to interpret intervals (optional) Default value: 0 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 EXTRA: Additional command-line parameters (optional) Argument type: string Acceptable values: - 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 FIELD_NAME_MIN: Attribute name for minimum elevation of contour polygon (optional) Default value: ELEV_MIN Argument type: string Acceptable values: - 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 FIELD_NAME_MAX: Attribute name for maximum elevation of contour polygon (optional) Default value: ELEV_MAX Argument type: string Acceptable values: - 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: Contours Argument type: vectorDestination Acceptable values: - Path for new vector layer

Usage

gdal_contour_polygon(
  INPUT = qgisprocess:::qgis_default_value(),
  BAND = qgisprocess:::qgis_default_value(),
  INTERVAL = qgisprocess:::qgis_default_value(),
  CREATE_3D = qgisprocess:::qgis_default_value(),
  IGNORE_NODATA = qgisprocess:::qgis_default_value(),
  NODATA = qgisprocess:::qgis_default_value(),
  OFFSET = qgisprocess:::qgis_default_value(),
  EXTRA = qgisprocess:::qgis_default_value(),
  FIELD_NAME_MIN = qgisprocess:::qgis_default_value(),
  FIELD_NAME_MAX = qgisprocess:::qgis_default_value(),
  OUTPUT = qgisprocess:::qgis_default_value(),
  ...,
  .complete_output = .complete_output_option(),
  .quiet = .quiet_option(),
  .messages = .message_option()
)

Arguments

INPUT	raster - Input layer. Path to a raster layer.
BAND	band - Band number. Integer value representing an existing raster band number.
INTERVAL	number - Interval between contour lines. 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_3D	boolean - Produce 3D vector. 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.
IGNORE_NODATA	boolean - Treat all raster values as valid. 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.
NODATA	number - Input pixel value to treat as NoData. 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.
OFFSET	number - Offset from zero relative to which to interpret intervals. 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.
EXTRA	string - Additional command-line parameters. 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.
FIELD_NAME_MIN	string - Attribute name for minimum elevation of contour polygon. 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.
FIELD_NAME_MAX	string - Attribute name for maximum elevation of contour polygon. 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	vectorDestination - Contours. Path for new vector 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

• OUTPUT - outputVector - Contours

JanCaha/r_package_qgis documentation built on April 12, 2025, 10:51 a.m.