gdal_dissolve: QGIS algorithm - Dissolve

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

QGIS algorithm - Dissolve

Description

QGIS Algorithm provided by GDAL Dissolve (gdal:dissolve). —————- Arguments —————- INPUT: Input layer Argument type: source Acceptable values: - Path to a vector layer FIELD: Dissolve field (optional) Argument type: field Acceptable values: - The name of an existing field - ; delimited list of existing field names GEOMETRY: Geometry column name Default value: geometry 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 EXPLODE_COLLECTIONS: Produce one feature for each geometry in any kind of geometry collection in the source file 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 KEEP_ATTRIBUTES: Keep input attributes 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 COUNT_FEATURES: Count dissolved features 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 COMPUTE_AREA: Compute area and perimeter of dissolved features 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 COMPUTE_STATISTICS: Compute min/max/sum/mean for attribute 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 STATISTICS_ATTRIBUTE: Numeric attribute to calculate statistics on (optional) Argument type: field Acceptable values: - The name of an existing field - ; delimited list of existing field names OPTIONS: Additional creation options (optional) Default value: 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: Dissolved Argument type: vectorDestination Acceptable values: - Path for new vector layer

Usage

gdal_dissolve(
  INPUT = qgisprocess:::qgis_default_value(),
  FIELD = qgisprocess:::qgis_default_value(),
  GEOMETRY = qgisprocess:::qgis_default_value(),
  EXPLODE_COLLECTIONS = qgisprocess:::qgis_default_value(),
  KEEP_ATTRIBUTES = qgisprocess:::qgis_default_value(),
  COUNT_FEATURES = qgisprocess:::qgis_default_value(),
  COMPUTE_AREA = qgisprocess:::qgis_default_value(),
  COMPUTE_STATISTICS = qgisprocess:::qgis_default_value(),
  STATISTICS_ATTRIBUTE = qgisprocess:::qgis_default_value(),
  OPTIONS = qgisprocess:::qgis_default_value(),
  OUTPUT = qgisprocess:::qgis_default_value(),
  ...,
  .complete_output = .complete_output_option(),
  .quiet = .quiet_option(),
  .messages = .message_option()
)

Arguments

INPUT	source - Input layer. Path to a vector layer.
FIELD	field - Dissolve field. The name of an existing field. ; delimited list of existing field names.
GEOMETRY	string - Geometry column name. 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.
EXPLODE_COLLECTIONS	boolean - Produce one feature for each geometry in any kind of geometry collection in the source file. 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.
KEEP_ATTRIBUTES	boolean - Keep input attributes. 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.
COUNT_FEATURES	boolean - Count dissolved features. 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.
COMPUTE_AREA	boolean - Compute area and perimeter of dissolved features. 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.
COMPUTE_STATISTICS	boolean - Compute min/max/sum/mean for attribute. 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.
STATISTICS_ATTRIBUTE	field - Numeric attribute to calculate statistics on. The name of an existing field. ; delimited list of existing field names.
OPTIONS	string - Additional 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	vectorDestination - Dissolved. 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 - Dissolved

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