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Vector geometry

Concave hull

Description

<put algorithm description here>

Parameters

Input point layer [vector: point]
<put parameter description here>
Threshold (0-1, where 1 is equivalent with Convex Hull) [number]

<put parameter description here>

Default: 0.3

Allow holes [boolean]

<put parameter description here>

Default: True

Split multipart geometry into singleparts geometries [boolean]

<put parameter description here>

Default: False

Outputs

Concave hull [vector]
<put output description here>

Console usage

processing.runalg('qgis:concavehull', input, alpha, holes, no_multigeometry, output)

See also

Convert geometry type

Description

Converts a geometry type to another one.

Parameters

Input layer [vector: any]
Layer in input.
New geometry type [selection]

Type of conversion to perform.

Options:

  • 0 — Centroids
  • 1 — Nodes
  • 2 — Linestrings
  • 3 — Multilinestrings
  • 4 — Polygons

Default: 0

Outputs

Output [vector]
The resulting layer.

Console usage

processing.runalg('qgis:convertgeometrytype', input, type, output)

See also

Convex hull

Description

<put algorithm description here>

Parameters

Input layer [vector: any]
<put parameter description here>
Field (optional, only used if creating convex hulls by classes) [tablefield: any]

Optional.

<put parameter description here>

Method [selection]

<put parameter description here>

Options:

  • 0 — Create single minimum convex hull
  • 1 — Create convex hulls based on field

Default: 0

Outputs

Convex hull [vector]
<put output description here>

Console usage

processing.runalg('qgis:convexhull', input, field, method, output)

See also

Create points along lines

Description

<put algorithm description here>

Parameters

lines [vector: any]
<put parameter description here>
distance [number]

<put parameter description here>

Default: 1

startpoint [number]

<put parameter description here>

Default: 0

endpoint [number]

<put parameter description here>

Default: 0

Outputs

output [vector]
<put output description here>

Console usage

processing.runalg('qgis:createpointsalonglines', lines, distance, startpoint, endpoint, output)

See also

Delaunay triangulation

Description

<put algorithm description here>

Parameters

Input layer [vector: point]
<put parameter description here>

Outputs

Delaunay triangulation [vector]
<put output description here>

Console usage

processing.runalg('qgis:delaunaytriangulation', input, output)

See also

Densify geometries given an interval

Description

<put algorithm description here>

Parameters

Input layer [vector: polygon, line]
<put parameter description here>
Interval between Vertices to add [number]

<put parameter description here>

Default: 1.0

Outputs

Densified layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:densifygeometriesgivenaninterval', input, interval, output)

See also

Densify geometries

Description

<put algorithm description here>

Parameters

Input layer [vector: polygon, line]
<put parameter description here>
Vertices to add [number]

<put parameter description here>

Default: 1

Outputs

Densified layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:densifygeometries', input, vertices, output)

See also

Dissolve

Description

<put algorithm description here>

Parameters

Input layer [vector: polygon, line]
<put parameter description here>
Dissolve all (do not use field) [boolean]

<put parameter description here>

Default: True

Unique ID field [tablefield: any]

Optional.

<put parameter description here>

Outputs

Dissolved [vector]
<put output description here>

Console usage

processing.runalg('qgis:dissolve', input, dissolve_all, field, output)

See also

Eliminate sliver polygons

Description

<put algorithm description here>

Parameters

Input layer [vector: polygon]
<put parameter description here>
Use current selection in input layer (works only if called from toolbox) [boolean]

<put parameter description here>

Default: False

Selection attribute [tablefield: any]
<put parameter description here>
Comparison [selection]

<put parameter description here>

Options:

  • 0 — ==
  • 1 — !=
  • 2 — >
  • 3 — >=
  • 4 — <
  • 5 — <=
  • 6 — begins with
  • 7 — contains

Default: 0

Value [string]

<put parameter description here>

Default: 0

Merge selection with the neighbouring polygon with the [selection]

<put parameter description here>

Options:

  • 0 — Largest area
  • 1 — Smallest Area
  • 2 — Largest common boundary

Default: 0

Outputs

Cleaned layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:eliminatesliverpolygons', input, keepselection, attribute, comparison, comparisonvalue, mode, output)

See also

Explode lines

Description

<put algorithm description here>

Parameters

Input layer [vector: line]
<put parameter description here>

Outputs

Output layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:explodelines', input, output)

See also

Extract nodes

Description

<put algorithm description here>

Parameters

Input layer [vector: polygon, line]
<put parameter description here>

Outputs

Output layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:extractnodes', input, output)

See also

Fill holes

Description

<put algorithm description here>

Parameters

Polygons [vector: any]
<put parameter description here>
Max area [number]

<put parameter description here>

Default: 100000

Outputs

Results [vector]
<put output description here>

Console usage

processing.runalg('qgis:fillholes', polygons, max_area, results)

See also

Fixed distance buffer

Description

<put algorithm description here>

Parameters

Input layer [vector: any]
<put parameter description here>
Distance [number]

<put parameter description here>

Default: 10.0

Segments [number]

<put parameter description here>

Default: 5

Dissolve result [boolean]

<put parameter description here>

Default: False

Outputs

Buffer [vector]
<put output description here>

Console usage

processing.runalg('qgis:fixeddistancebuffer', input, distance, segments, dissolve, output)

See also

Keep n biggest parts

Description

<put algorithm description here>

Parameters

Polygons [vector: polygon]
<put parameter description here>
To keep [number]

<put parameter description here>

Default: 1

Outputs

Results [vector]
<put output description here>

Console usage

processing.runalg('qgis:keepnbiggestparts', polygons, to_keep, results)

See also

Lines to polygons

Description

<put algorithm description here>

Parameters

Input layer [vector: line]
<put parameter description here>

Outputs

Output layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:linestopolygons', input, output)

See also

Multipart to singleparts

Description

<put algorithm description here>

Parameters

Input layer [vector: any]
<put parameter description here>

Outputs

Output layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:multiparttosingleparts', input, output)

See also

Points displacement

Description

Moves overlapped points at small distance, that they all become visible. The result is very similar to the output of the “Point displacement” renderer but it is permanent.

Parameters

Input layer [vector: point]
Layer with overlapped points.
Displacement distance [number]

Desired displacement distance NOTE: displacement distance should be in same units as layer.

Default: 0.00015

Horizontal distribution for two point case [boolean]

Controls distribution direction in case of two overlapped points. If True points will be distributed horizontally, otherwise they will be distributed vertically.

Default: True

Outputs

Output layer [vector]
The resulting layer with shifted overlapped points.

Console usage

processing.runalg('qgis:pointsdisplacement', input_layer, distance, horizontal, output_layer)

See also

Polygon centroids

Description

<put algorithm description here>

Parameters

Input layer [vector: polygon]
<put parameter description here>

Outputs

Output layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:polygoncentroids', input_layer, output_layer)

See also

Polygonize

Description

<put algorithm description here>

Parameters

Input layer [vector: line]
<put parameter description here>
Keep table structure of line layer [boolean]

<put parameter description here>

Default: False

Create geometry columns [boolean]

<put parameter description here>

Default: True

Outputs

Output layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:polygonize', input, fields, geometry, output)

See also

Polygons to lines

Description

<put algorithm description here>

Parameters

Input layer [vector: polygon]
<put parameter description here>

Outputs

Output layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:polygonstolines', input, output)

See also

Simplify geometries

Description

<put algorithm description here>

Parameters

Input layer [vector: polygon, line]
<put parameter description here>
Tolerance [number]

<put parameter description here>

Default: 1.0

Outputs

Simplified layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:simplifygeometries', input, tolerance, output)

See also

Singleparts to multipart

Description

<put algorithm description here>

Parameters

Input layer [vector: any]
<put parameter description here>
Unique ID field [tablefield: any]
<put parameter description here>

Outputs

Output layer [vector]
<put output description here>

Console usage

processing.runalg('qgis:singlepartstomultipart', input, field, output)

See also

Variable distance buffer

Description

<put algorithm description here>

Parameters

Input layer [vector: any]
<put parameter description here>
Distance field [tablefield: any]
<put parameter description here>
Segments [number]

<put parameter description here>

Default: 5

Dissolve result [boolean]

<put parameter description here>

Default: False

Outputs

Buffer [vector]
<put output description here>

Console usage

processing.runalg('qgis:variabledistancebuffer', input, field, segments, dissolve, output)

See also

Voronoi polygons

Description

<put algorithm description here>

Parameters

Input layer [vector: point]
<put parameter description here>
Buffer region [number]

<put parameter description here>

Default: 0.0

Outputs

Voronoi polygons [vector]
<put output description here>

Console usage

processing.runalg('qgis:voronoipolygons', input, buffer, output)

See also