QGIS/resources/function_help/json/simplify_vw

{
  "name": "simplify_vw",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Simplifies a geometry by removing nodes using an area based threshold (ie, the Visvalingam-Whyatt algorithm). The algorithm removes vertices which create small areas in geometries, e.g., narrow spikes or nearly straight segments.",
  "arguments": [{
    "arg": "geometry",
    "description": "a geometry"
  }, {
    "arg": "tolerance",
    "description": "a measure of the maximum area created by a node for the node to be removed"
  }],
  "examples": [{
    "expression": "geom_to_wkt(simplify_vw(geometry:=geom_from_wkt('LineString(0 0, 5 0, 5.01 10, 5.02 0, 10 0)'),tolerance:=5))",
    "returns": "'LineString(0 0, 10 0)'"
  }],
  "tags": ["spikes", "areas", "straight", "nodes", "algorithm", "area", "simplifies", "removes", "narrow", "segments", "visvalingam", "threshold", "create", "vertices", "removing", "based", "small"]
}