qgis_stdbscanclustering: QGIS algorithm - ST-DBSCAN clustering

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

QGIS algorithm - ST-DBSCAN clustering

Description

QGIS Algorithm provided by QGIS (native c++) ST-DBSCAN clustering (native:stdbscanclustering). Clusters spatiotemporal point features using a time and density based scan algorithm. Clusters point features based on a 2D implementation of spatiotemporal density-based clustering of applications with noise (ST-DBSCAN) algorithm. For more details, please see the following papers: * Ester, M., H. P. Kriegel, J. Sander, and X. Xu, "A Density-Based Algorithm for Discovering Clusters in Large Spatial Databases with Noise". In: Proceedings of the 2nd International Conference on Knowledge Discovery and Data Mining, Portland, OR, AAAI Press, pp. 226-231. 1996 * Birant, Derya, and Alp Kut. "ST-DBSCAN: An algorithm for clustering spatial–temporal data." Data & Knowledge Engineering 60.1 (2007): 208-221. * Peca, I., Fuchs, G., Vrotsou, K., Andrienko, N. V., & Andrienko, G. L. (2012). Scalable Cluster Analysis of Spatial Events. In EuroVA@ EuroVis.

Usage

qgis_stdbscanclustering(
  INPUT = qgisprocess:::qgis_default_value(),
  DATETIME_FIELD = qgisprocess:::qgis_default_value(),
  MIN_SIZE = qgisprocess:::qgis_default_value(),
  EPS = qgisprocess:::qgis_default_value(),
  EPS2 = qgisprocess:::qgis_default_value(),
  DBSCAN = qgisprocess:::qgis_default_value(),
  FIELD_NAME = qgisprocess:::qgis_default_value(),
  SIZE_FIELD_NAME = 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.
DATETIME_FIELD	field - Date/time field. The name of an existing field. ; delimited list of existing field names.
MIN_SIZE	number - Minimum cluster size. 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.
EPS	distance - Maximum distance between clustered points. 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.
EPS2	duration - Maximum time duration between clustered points. A numeric value (unit type set by algorithms). 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.
DBSCAN	boolean - Treat border points as noise (DBSCAN*). 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. Original algorithm parameter name: DBSCAN*.
FIELD_NAME	string - Cluster 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.
SIZE_FIELD_NAME	string - Cluster size 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 - Clusters. 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

• NUM_CLUSTERS - outputNumber - Number of clusters

• OUTPUT - outputVector - Clusters

JanCaha/r_package_qgis documentation built on April 4, 2024, 8:10 p.m.