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24.1.25. Vector selection

24.1.25.1. Extract by attribute 

Creates two vector layers from an input layer: one will contain only matching features while the second will contain all the non-matching features.

The criteria for adding features to the resulting layer is based on the values of an attribute from the input layer.

Zobacz także

Select by attribute

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[vector: any]	Layer to extract features from.
Selection attribute	`FIELD`	[tablefield: any]	Filtering field of the layer
Operator	`OPERATOR`	[wyliczenie] Domyślnie: 0	Many different operators are available: 0 — = 1 — ≠ 2 — > 3 — >= 4 — < 5 — <= 6 — begins with 7 — contains 8 — is null 9 — is not null 10 — does not contain
Wartość Opcjonalne	`VALUE`	[ciąg tekstowy]	Value to be evaluated
Extracted (attribute)	`OUTPUT`	[same as input] Default: `[Create Temporary Layer]`	Specify the output vector layer for matching features. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Zapisz do pliku… Zapisz do GeoPackage… Zapisz do tabeli bazy danych… The file encoding can also be changed here.
Extracted (non-matching)	`FAIL_OUTPUT`	[same as input] Default: `[Skip output]`	Specify the output vector layer for non-matching features. One of: Pomiń wyjście Create Temporary Layer (`TEMPORARY_OUTPUT`) Zapisz do pliku… Zapisz do GeoPackage… Zapisz do tabeli bazy danych… The file encoding can also be changed here.

Wyniki

Etykieta	Nazwa	Typ	Opis
Extracted (attribute)	`OUTPUT`	[same as input]	Vector layer with matching features from the input layer
Extracted (non-matching)	`FAIL_OUTPUT`	[same as input]	Vector layer with non-matching features from the input layer

Kod pythona

ID algorytmu: qgis:extractbyattribute

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.2. Extract by expression 

Creates two vector layers from an input layer: one will contain only matching features while the second will contain all the non-matching features.

The criteria for adding features to the resulting layer is based on a QGIS expression. For more information about expressions see the Expressions.

Zobacz także

Select by expression

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[vector: any]	Input vector layer
Wyrażenie	`EXPRESSION`	[wyrażenie]	Expression to filter the vector layer
Matching features	`OUTPUT`	[same as input] Default: `[Create Temporary Layer]`	Specify the output vector layer for matching features. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Zapisz do pliku… Zapisz do GeoPackage… Zapisz do tabeli bazy danych… The file encoding can also be changed here.
Nie-pasujący	`FAIL_OUTPUT`	[same as input] Default: `[Skip output]`	Specify the output vector layer for non-matching features. One of: Pomiń wyjście Create Temporary Layer (`TEMPORARY_OUTPUT`) Zapisz do pliku… Zapisz do GeoPackage… Zapisz do tabeli bazy danych… The file encoding can also be changed here.

Wyniki

Etykieta	Nazwa	Typ	Opis
Matching features	`OUTPUT`	[same as input]	Vector layer with matching features from the input layer
Nie-pasujący	`FAIL_OUTPUT`	[same as input]	Vector layer with non-matching features from the input layer

Kod pythona

ID algorytmu: qgis:extractbyexpression

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.3. Extract by location 

Creates a new vector layer that only contains matching features from an input layer.

The criteria for adding features to the resulting layer is based on the spatial relationship between each feature and the features in an additional layer.

Zobacz także

Select by location, Extract within distance

Exploring spatial relations

Geometric predicates are boolean functions used to determine the spatial relation a feature has with another by comparing whether and how their geometries share a portion of space.

../../../../_images/selectbylocation.png — Rys. 24.133 Looking for spatial relations between layers

Using the figure above, we are looking for the green circles by spatially comparing them to the orange rectangle feature. Available geometric predicates are:

Przecina: Tests whether a geometry intersects another. Returns 1 (true) if the geometries spatially intersect (share any portion of space - overlap or touch) and 0 if they don’t. In the picture above, this will return circles 1, 2 and 3.
Zawiera: Returns 1 (true) if and only if no points of b lie in the exterior of a, and at least one point of the interior of b lies in the interior of a. In the picture, no circle is returned, but the rectangle would be if you would look for it the other way around, as it contains circle 1 completely. This is the opposite of are within.
Jest rozłączne: Returns 1 (true) if the geometries do not share any portion of space (no overlap, not touching). Only circle 4 is returned.
Jest tożsame: Returns 1 (true) if and only if geometries are exactly the same. No circles will be returned.
Dotyka: Tests whether a geometry touches another. Returns 1 (true) if the geometries have at least one point in common, but their interiors do not intersect. Only circle 3 is returned.
Nachodzi: Tests whether a geometry overlaps another. Returns 1 (true) if the geometries share space, are of the same dimension, but are not completely contained by each other. Only circle 2 is returned.
Are within: Tests whether a geometry is within another. Returns 1 (true) if geometry a is completely inside geometry b. Only circle 1 is returned.
Cross: Returns 1 (true) if the supplied geometries have some, but not all, interior points in common and the actual crossing is of a lower dimension than the highest supplied geometry. For example, a line crossing a polygon will cross as a line (true). Two lines crossing will cross as a point (true). Two polygons cross as a polygon (false). In the picture, no circles will be returned.

Parametry

Etykieta	Nazwa	Typ	Opis
Extract features from	`INPUT`	[vector: geometry]	Input vector layer
Where the features (geometric predicate)	`PREDICATE`	[enumeration] [list] Domyślnie: [0]	Type of spatial relation the input feature should have with an intersect feature so that it could be selected. One or more of: 0 — intersect 1 — contain 2 — disjoint 3 — equal 4 — touch 5 — overlap 6 — are within 7 — cross If more than one condition is chosen, at least one of them (OR operation) has to be met for a feature to be extracted.
By comparing to the features from	`INTERSECT`	[vector: geometry]	Intersection vector layer
Extracted (location)	`OUTPUT`	[same as input] Default: `[Create temporary layer]`	Specify the output vector layer for the features that have the chosen spatial relationship(s) with one or more features in the comparison layer. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Zapisz do pliku… Zapisz do GeoPackage… Zapisz do tabeli bazy danych… The file encoding can also be changed here.

Wyniki

Etykieta	Nazwa	Typ	Opis
Extracted (location)	`OUTPUT`	[same as input]	Vector layer with features from the input layer that have the chosen spatial relationship(s) with one or more features in the comparison layer.

Kod pythona

ID algorytmu: qgis:extractbylocation

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.4. Extract within distance 

Creates a new vector layer that only contains matching features from an input layer. Features are copied wherever they are within the specified maximum distance from the features in an additional reference layer.

Zobacz także

Select within distance, Extract by location

Parametry

Etykieta	Nazwa	Typ	Opis
Extract features from	`INPUT`	[vector: geometry]	Input vector layer to copy features from
By comparing to the features from	`REFERENCE`	[vector: geometry]	Vector layer whose features closeness is used
Where the features are within	`DISTANCE`	[numeric: double] Default: 100.0	The maximum distance around reference features to select input features within
Modify current selection by	`METHOD`	[wyliczenie] Domyślnie: 0	How the selection of the algorithm should be managed. One of: 0 — creating new selection 1 — adding to current selection 2 — selecting within current selection 3 — removing from current selection
Extracted (location)	`OUTPUT`	[same as input] Default: `[Create temporary layer]`	Specify the output vector layer for the features that are within the set distance from reference features. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Zapisz do pliku… Zapisz do GeoPackage… Zapisz do tabeli bazy danych… The file encoding can also be changed here.

Wyniki

Etykieta	Nazwa	Typ	Opis
Extracted (location)	`OUTPUT`	[same as input]	Vector layer with features from the input layer matching the condition of distance from reference features

Kod pythona

ID algorytmu: native:extractwithindistance

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.5. Filter by geometry type 

Filters features by their geometry type. Incoming features will be directed to different outputs based on whether they have a point, line or polygon geometry.

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[vector: any]	Layer to evaluate

Wyniki

Etykieta	Nazwa	Typ	Opis
Point features Opcjonalne	`POINTS`	[vector: point]	Layer with points
Line features Opcjonalne	`LINES`	[vector: line]	Layer with lines
Polygon features Opcjonalne	`POLYGONS`	[vector: polygon]	Layer with polygons
Features with no geometry Opcjonalne	`NO_GEOMETRY`	[vector: table]	Geometry-less vector layer

Kod pythona

ID algorytmu: native:filterbygeometry

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.6. Random extract 

Takes a vector layer and generates a new one that contains only a subset of the features in the input layer.

The subset is defined randomly, based on feature IDs, using a percentage or count value to define the total number of features in the subset.

Ostrzeżenie

This algorithm drops existing primary keys or FID values and regenerate them in output layers.

Zobacz także

Random selection

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[vector: any]	Source vector layer to select the features from
Metoda	`METHOD`	[wyliczenie] Domyślnie: 0	Random selection methods. One of: 0 — Number of selected features 1 — Percentage of selected features
Number/percentage of selected features	`NUMBER`	[numeric: integer] Domyślnie: 10	Number or percentage of features to select
Extracted (random)	`OUTPUT`	[same as input] Default: `[Create temporary layer]`	Specify the output vector layer for the randomly selected features. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Zapisz do pliku… Zapisz do GeoPackage… Zapisz do tabeli bazy danych… The file encoding can also be changed here.

Wyniki

Etykieta	Nazwa	Typ	Opis
Extracted (random)	`OUTPUT`	[same as input]	Vector layer containing randomly selected features from the input layer

Kod pythona

ID algorytmu: qgis:randomextract

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.7. Random extract within subsets 

Takes a vector layer and generates a new one that contains only a subset of the features in the input layer.

The subset is defined randomly, based on feature IDs, using a percentage or count value to define the total number of features in the subset. The percentage/count value is not applied to the whole layer, but instead to each category. Categories are defined according to a given attribute.

Zobacz także

Random selection within subsets

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[vector: any]	Vector layer to select the features from
ID field	`FIELD`	[tablefield: any]	Category of the source vector layer to select the features from
Metoda	`METHOD`	[wyliczenie] Domyślnie: 0	Random selection method. One of: 0 — Number of selected features 1 — Percentage of selected features
Number/percentage of selected features	`NUMBER`	[numeric: integer] Domyślnie: 10	Number or percentage of features to select
Extracted (random stratified)	`OUTPUT`	[same as input] Default: `[Create temporary layer]`	Specify the output vector layer for the randomly selected features. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Zapisz do pliku… Zapisz do GeoPackage… Zapisz do tabeli bazy danych… The file encoding can also be changed here.

Wyniki

Etykieta	Nazwa	Typ	Opis
Extracted (random stratified)	`OUTPUT`	[same as input]	Vector layer containing randomly selected features from the input layer

Kod pythona

ID algorytmu: qgis:randomextractwithinsubsets

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.8. Random selection 

Takes a vector layer and selects a subset of its features. No new layer is generated by this algorithm.

The subset is defined randomly, based on feature IDs, using a percentage or count value to define the total number of features in the subset.

Default menu: Vector ► Research Tools

Zobacz także

Random extract

Parametry

Etykieta

Nazwa

Typ

Opis

Warstwa wejściowa

INPUT

[vector: any]

Vector layer for the selection

Metoda

METHOD

[wyliczenie]

Domyślnie: 0

Random selection method. One of:

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

Number/percentage of selected features

NUMBER

[numeric: integer]

Domyślnie: 10

Number or percentage of features to select

Wyniki

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[same as input]	The input layer with features selected

Kod pythona

ID algorytmu: qgis:randomselection

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.9. Random selection within subsets 

Takes a vector layer and selects a subset of its features. No new layer is generated by this algorithm.

The subset is defined randomly, based on feature IDs, using a percentage or count value to define the total number of features in the subset.

The percentage/count value is not applied to the whole layer, but instead to each category.

Categories are defined according to a given attribute, which is also specified as an input parameter for the algorithm.

No new outputs are created.

Default menu: Vector ► Research Tools

Zobacz także

Random extract within subsets

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[vector: any]	Vector layer to select features in
ID field	`FIELD`	[tablefield: any]	Category of the input layer to select the features from
Metoda	`METHOD`	[wyliczenie] Domyślnie: 0	Random selection method. One of: 0 — Number of selected features 1 — Percentage of selected features
Number/percentage of selected features	`NUMBER`	[numeric: integer] Domyślnie: 10	Number or percentage of features to select

Wyniki

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[same as input]	The input layer with features selected

Kod pythona

ID algorytmu: qgis:randomselectionwithinsubsets

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.10. Select by attribute 

Creates a selection in a vector layer.

The criteria for selecting features is based on the values of an attribute from the input layer.

Zobacz także

Extract by attribute

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[vector: any]	Vector layer to select features in
Selection attribute	`FIELD`	[tablefield: any]	Filtering field of the layer
Operator	`OPERATOR`	[wyliczenie] Domyślnie: 0	Many different operators are available: 0 — = 1 — ≠ 2 — > 3 — >= 4 — < 5 — <= 6 — begins with 7 — contains 8 — is null 9 — is not null 10 — does not contain
Wartość Opcjonalne	`VALUE`	[ciąg tekstowy]	Value to be evaluated
Modify current selection by	`METHOD`	[wyliczenie] Domyślnie: 0	How the selection of the algorithm should be managed. One of: 0 — creating new selection 1 — adding to current selection 2 — removing from current selection 3 — selecting within current selection

Wyniki

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[same as input]	The input layer with features selected

Kod pythona

ID algorytmu: qgis:selectbyattribute

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.11. Select by expression 

Creates a selection in a vector layer.

The criteria for selecting features is based on a QGIS expression. For more information about expressions see the Expressions.

Zobacz także

Extract by expression

Parametry

Etykieta

Nazwa

Typ

Opis

Warstwa wejściowa

INPUT

[vector: any]

Input vector layer

Wyrażenie

EXPRESSION

[wyrażenie]

Expression to filter the input layer

Modify current selection by

METHOD

[wyliczenie]

Domyślnie: 0

How the selection of the algorithm should be managed. One of:

0 — creating new selection
1 — adding to current selection
2 — removing from current selection
3 — selecting within current selection

Wyniki

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[same as input]	The input layer with features selected

Kod pythona

ID algorytmu: qgis:selectbyexpression

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.12. Select by location 

Creates a selection in a vector layer.

The criteria for selecting features is based on the spatial relationship between each feature and the features in an additional layer.

Default menu: Vector ► Research Tools

Zobacz także

Extract by location, Select within distance

Exploring spatial relations

Geometric predicates are boolean functions used to determine the spatial relation a feature has with another by comparing whether and how their geometries share a portion of space.

Using the figure above, we are looking for the green circles by spatially comparing them to the orange rectangle feature. Available geometric predicates are:

Przecina: Tests whether a geometry intersects another. Returns 1 (true) if the geometries spatially intersect (share any portion of space - overlap or touch) and 0 if they don’t. In the picture above, this will return circles 1, 2 and 3.
Zawiera: Returns 1 (true) if and only if no points of b lie in the exterior of a, and at least one point of the interior of b lies in the interior of a. In the picture, no circle is returned, but the rectangle would be if you would look for it the other way around, as it contains circle 1 completely. This is the opposite of are within.
Jest rozłączne: Returns 1 (true) if the geometries do not share any portion of space (no overlap, not touching). Only circle 4 is returned.
Jest tożsame: Returns 1 (true) if and only if geometries are exactly the same. No circles will be returned.
Dotyka: Tests whether a geometry touches another. Returns 1 (true) if the geometries have at least one point in common, but their interiors do not intersect. Only circle 3 is returned.
Nachodzi: Tests whether a geometry overlaps another. Returns 1 (true) if the geometries share space, are of the same dimension, but are not completely contained by each other. Only circle 2 is returned.
Are within: Tests whether a geometry is within another. Returns 1 (true) if geometry a is completely inside geometry b. Only circle 1 is returned.
Cross: Returns 1 (true) if the supplied geometries have some, but not all, interior points in common and the actual crossing is of a lower dimension than the highest supplied geometry. For example, a line crossing a polygon will cross as a line (true). Two lines crossing will cross as a point (true). Two polygons cross as a polygon (false). In the picture, no circles will be returned.

Parametry

Etykieta	Nazwa	Typ	Opis
Select features from	`INPUT`	[vector: geometry]	Input vector layer
Where the features (geometric predicate)	`PREDICATE`	[enumeration] [list] Domyślnie: [0]	Type of spatial relation the input feature should have with an intersect feature so that it could be selected. One or more of: 0 — intersect 1 — contain 2 — disjoint 3 — equal 4 — touch 5 — overlap 6 — are within 7 — cross If more than one condition is chosen, at least one of them (OR operation) has to be met for a feature to be extracted.
By comparing to the features from	`INTERSECT`	[vector: geometry]	Intersection vector layer
Modify current selection by	`METHOD`	[wyliczenie] Domyślnie: 0	How the selection of the algorithm should be managed. One of: 0 — creating new selection 1 — adding to current selection 2 — selecting within current selection 3 — removing from current selection

Wyniki

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[same as input]	The input layer with features selected

Kod pythona

ID algorytmu: qgis:selectbylocation

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.25.13. Select within distance 

creates a selection in a vector layer. Features are selected wherever they are within the specified maximum distance from the features in an additional reference layer.

Zobacz także

Extract within distance, Select by location

Parametry

Etykieta	Nazwa	Typ	Opis
Select features from	`INPUT`	[vector: geometry]	Input vector layer to select features from
By comparing to the features from	`REFERENCE`	[vector: geometry]	Vector layer whose features closeness is used
Where the features are within	`DISTANCE`	[numeric: double] Default: 100.0	The maximum distance around reference features to select input features
Modify current selection by	`METHOD`	[wyliczenie] Domyślnie: 0	How the selection of the algorithm should be managed. One of: 0 — creating new selection 1 — adding to current selection 2 — selecting within current selection 3 — removing from current selection

Wyniki

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	`INPUT`	[same as input]	The input layer with features selected

Kod pythona

ID algorytmu: native:selectwithindistance

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.