Vector selection

Extract by attribute

Description

<put algorithm description here>

Parameters

Input Layer [vector: any]
<put parameter description here>
Selection attribute [tablefield: any]
<put parameter description here>
Operator [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: (not set)

Outputs

Output [vector]
<put output description here>

Console usage

processing.runalg('qgis:extractbyattribute', input, field, operator, value, output)

See also

Extract by location

Description

<put algorithm description here>

Parameters

Layer to select from [vector: any]
<put parameter description here>
Additional layer (intersection layer) [vector: any]
<put parameter description here>
Predicate [array of Unicode strings]

Condition for the selection. Array of one or more of the following predicates:

  • disjoint
  • intersects
  • contains
  • equals
  • touches
  • overlaps
  • within
  • crosses

For console usage the predicates must be defined as an array of Unicode strings, eg. [u’intersects’,u’contains’]

Outputs

Selection [vector]
<put output description here>

Console usage

processing.runalg('qgis:extractbylocation', input, intersect, predicates, output)

See also

Random extract

Description

<put algorithm description here>

Parameters

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

<put parameter description here>

Options:

  • 0 — Number of selected features
  • 1 — Percentage of selected features

Default: 0

Number/percentage of selected features [number]

<put parameter description here>

Default: 10

Outputs

Selection [vector]
<put output description here>

Console usage

processing.runalg('qgis:randomextract', input, method, number, output)

See also

Random extract within subsets

Description

<put algorithm description here>

Parameters

Input layer [vector: any]
<put parameter description here>
ID Field [tablefield: any]
<put parameter description here>
Method [selection]

<put parameter description here>

Options:

  • 0 — Number of selected features
  • 1 — Percentage of selected features

Default: 0

Number/percentage of selected features [number]

<put parameter description here>

Default: 10

Outputs

Selection [vector]
<put output description here>

Console usage

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

See also

Random selection

Description

<put algorithm description here>

Parameters

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

<put parameter description here>

Options:

  • 0 — Number of selected features
  • 1 — Percentage of selected features

Default: 0

Number/percentage of selected features [number]

<put parameter description here>

Default: 10

Outputs

Selection [vector]
<put output description here>

Console usage

processing.runalg('qgis:randomselection', input, method, number)

See also

Random selection within subsets

Description

<put algorithm description here>

Parameters

Input layer [vector: any]
<put parameter description here>
ID Field [tablefield: any]
<put parameter description here>
Method [selection]

<put parameter description here>

Options:

  • 0 — Number of selected features
  • 1 — Percentage of selected features

Default: 0

Number/percentage of selected features [number]

<put parameter description here>

Default: 10

Outputs

Selection [vector]
<put output description here>

Console usage

processing.runalg('qgis:randomselectionwithinsubsets', input, field, method, number)

See also

Select by attribute

Description

Selects and saves as new layer all features from input layer that satisfy condition.

NOTE: algorithm is case-sensitive (“qgis” is different from “Qgis” and “QGIS”)

Parameters

Input Layer [vector: any]
Layer to process.
Selection attribute [tablefield: any]
Field on which perform the selection.
Operator [selection]

Comparison operator.

Options:

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

Default: 0

Value [string]

Value to compare.

Default: (not set)

Outputs

Output [vector]
The resulting layer.

Console usage

processing.runalg('qgis:selectbyattribute', input, field, operator, value, output)

See also

Select by expression

Description

<put algorithm description here>

Parameters

Input Layer [vector: any]
<put parameter description here>
Expression [string]

<put parameter description here>

Default: (not set)

Modify current selection by [selection]

<put parameter description here>

Options:

  • 0 — creating new selection
  • 1 — adding to current selection
  • 2 — removing from current selection

Default: 0

Outputs

Output [vector]
<put output description here>

Console usage

processing.runalg('qgis:selectbyexpression', layername, expression, method)

See also

Select by location

Description

<put algorithm description here>

Parameters

Layer to select from [vector: any]
<put parameter description here>
Additional layer (intersection layer) [vector: any]
<put parameter description here>
Predicate [array of Unicode strings]

Condition for the selection. Array of one or more of the following predicates:

  • disjoint
  • intersects
  • contains
  • equals
  • touches
  • overlaps
  • within
  • crosses

For console usage the precicates must be defined as an array of Unicode strings, eg. [u’intersects’,u’contains’]

Modify current selection by [selection]

<put parameter description here>

Options:

  • 0 — creating new selection
  • 1 — adding to current selection
  • 2 — removing from current selection

Default: 0

Outputs

Selection [vector]
<put output description here>

Console usage

processing.runalg('qgis:selectbylocation', input, intersect, predicate, method)

See also