qgis_sumlinelengths: QGIS algorithm - Sum line lengths

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

QGIS algorithm - Sum line lengths

Description

QGIS Algorithm provided by QGIS (native c++) Sum line lengths (native:sumlinelengths). This algorithm takes a polygon layer and a line layer and measures the total length of lines and the total number of them that cross each polygon. The resulting layer has the same features as the input polygon layer, but with two additional attributes containing the length and count of the lines across each polygon. The names of these two fields can be configured in the algorithm parameters.

Usage

qgis_sumlinelengths(
  POLYGONS = qgisprocess:::qgis_default_value(),
  LINES = qgisprocess:::qgis_default_value(),
  LEN_FIELD = qgisprocess:::qgis_default_value(),
  COUNT_FIELD = qgisprocess:::qgis_default_value(),
  OUTPUT = qgisprocess:::qgis_default_value(),
  ...,
  .complete_output = .complete_output_option(),
  .quiet = .quiet_option(),
  .messages = .message_option()
)

Arguments

POLYGONS	source - Polygons. Path to a vector layer.
LINES	source - Lines. Path to a vector layer.
LEN_FIELD	string - Lines length field 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.
COUNT_FIELD	string - Lines count field 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.
OUTPUT	sink - Line length. 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 - Line length

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