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28.1.25. Vector table

28.1.25.1. Add autoincremental field 

Adds a new integer field to a vector layer, with a sequential value for each feature.

This field can be used as a unique ID for features in the layer. The new attribute is not added to the input layer but a new layer is generated instead.

The initial starting value for the incremental series can be specified. Optionally, the incremental series can be based on grouping fields and a sort order for features can also be specified.

Параметры

Ярлык	Имя	Тип	Описание
Исходный слой	`INPUT`	[vector: any]	The input vector layer.
Field name	`FIELD_NAME`	[string] Default: „AUTO“	Name of the field with autoincremental values
Start values at Optional	`START`	[number] Default: 0	Choose the initial number of the incremental count
Modulus value Optional	`MODULUS`	[number] Default: 0	Specifying an optional modulus value will restart the count to START whenever the field value reaches the modulus value. `0` means no restart.
Group values by Optional	`GROUP_FIELDS`	[tablefield: any] [list]	Select grouping field(s): instead of a single count run for the whole layer, a separate count is processed for each value returned by the combination of these fields.
Sort expression Optional	`SORT_EXPRESSION`	[expression]	Use an expression to sort the features in the layer either globally or if set, based on group fields.
Sort ascending	`SORT_ASCENDING`	[логическое значение] Default: True	When a `sort expression` is set, use this option to control the order in which features are assigned values.
Sort nulls first	`SORT_NULLS_FIRST`	[логическое значение] По умолчанию: Ложь	When a `sort expression` is set, use this option to set whether Null values are counted first or last.
Incremented	`OUTPUT`	[same as input] Default: `[Create temporary layer]`	Specify the output vector layer with the auto increment field. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… Append to Layer… The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Incremented	`OUTPUT`	[same as input]	Vector layer with auto incremental field

Код на Python

Algorithm ID: native:addautoincrementalfield

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.2. Add field to attributes table 

Adds a new field to a vector layer.

The name and characteristics of the attribute are defined as parameters.

The new attribute is not added to the input layer but a new layer is generated instead.

Параметры

Ярлык	Имя	Тип	Описание
Исходный слой	`INPUT`	[vector: any]	The input layer
Field name	`FIELD_NAME`	[string]	Name of the new field
Field type	`FIELD_TYPE`	[enumeration] Default: 0	Type of the new field. You can choose between: 0 — Integer (32 bit) 1 — Decimal (double) 2 — Text (string) 3 — Boolean 4 — Date 5 — Time 6 — Date & Time 7 — Binary Object (BLOB) 8 — String List 9 — Integer List 10 — Decimal (double) List
Field length	`FIELD_LENGTH`	[number] Default: 10	Length of the field
Field precision	`FIELD_PRECISION`	[number] Default: 0	Precision of the field. Useful with Float field type.
Field alias `NEW in 3.32` Optional	`FIELD_ALIAS`	[string]	Set a name to use as alias for the field. Not supported by all format types.
Field comment `NEW in 3.32` Optional	`FIELD_COMMENT`	[string]	Store a comment describing the field. Not supported by all format types.
Added	`OUTPUT`	[same as input] Default: `[Create temporary layer]`	Specify the output vector layer. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… Append to Layer… The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Added	`OUTPUT`	[same as input]	Vector layer with new field added

Код на Python

Algorithm ID: native:addfieldtoattributestable

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.3. Add unique value index field 

Takes a vector layer and an attribute and adds a new numeric field.

Values in this field correspond to values in the specified attribute, so features with the same value for the attribute will have the same value in the new numeric field.

This creates a numeric equivalent of the specified attribute, which defines the same classes.

The new attribute is not added to the input layer but a new layer is generated instead.

Параметры

Ярлык	Имя	Тип	Описание
Исходный слой	`INPUT`	[vector: any]	The input layer.
Class field	`FIELD`	[tablefield: any]	Features that have the same value for this field will get the same index.
Output field name	`FIELD_NAME`	[string] Default: „NUM_FIELD“	Name of the new field containing the indexes.
Layer with index field	`OUTPUT`	[vector: any] Default: `[Create temporary layer]`	Vector layer with the numeric field containing indexes. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.
Class summary	`SUMMARY_OUTPUT`	[таблица] Default: `[Skip output]`	Specify the table to contain the summary of the class field mapped to the corresponding unique value. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Layer with index field	`OUTPUT`	[same as input]	Vector layer with the numeric field containing indexes.
Class summary	`SUMMARY_OUTPUT`	[таблица]	Table with summary of the class field mapped to the corresponding unique value.

Код на Python

Algorithm ID: native:adduniquevalueindexfield

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.4. Add X/Y fields to layer 

Adds X and Y (or latitude/longitude) fields to a point layer. The X/Y fields can be calculated in a different CRS to the layer (e.g. creating latitude/longitude fields for a layer in a projected CRS).

Allows features in-place modification of point features

Параметры

Ярлык	Имя	Тип	Описание
Исходный слой	`INPUT`	[vector: point]	The input layer.
Coordinate system	`CRS`	[crs] Default: «EPSG:4326»	Coordinate reference system to use for the generated x and y fields.
Field prefix Optional	`PREFIX`	[string]	Prefix to add to the new field names to avoid name collisions with fields in the input layer.
Added fields	`OUTPUT`	[vector: point] Default: `[Create temporary layer]`	Specify the output layer. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… Append to Layer… The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Added fields	`OUTPUT`	[vector: point]	The output layer - identical to the input layer but with two new double fields, `x` and `y`.

Код на Python

Algorithm ID: native:addxyfieldstolayer

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.5. Advanced Python field calculator 

Adds a new attribute to a vector layer, with values resulting from applying an expression to each feature.

The expression is defined as a Python function.

Параметры

Ярлык	Имя	Тип	Описание
Исходный слой	`INPUT`	[vector: any]	Input vector layer
Result field name	`FIELD_NAME`	[string] Default: „NewField“	Name of the new field
Field type	`FIELD_TYPE`	[enumeration] Default: 0	Type of the new field. One of: 0 — Integer (32 bit) 1 — Decimal (double) 2 — Text (string) 3 — Boolean 4 — Date 5 — Time 6 — Date & Time 7 — Binary Object (BLOB) 8 — String List 9 — Integer List 10 — Decimal (double) List
Field length	`FIELD_LENGTH`	[number] Default: 10	Length of the field
Field precision	`FIELD_PRECISION`	[number] Default: 3	Precision of the field. Useful with Float field type.
Global expression Optional	`GLOBAL`	[string]	The code in the global expression section will be executed only once before the calculator starts iterating through all the features of the input layer. Therefore, this is the correct place to import necessary modules or to calculate variables that will be used in subsequent calculations.
Formula	`FORMULA`	[string]	The Python formula to evaluate. Example: To calculate the area of an input polygon layer you can add: value = $geom.area()
Calculated	`OUTPUT`	[same as input] Default: `[Create temporary layer]`	Specify the vector layer with the new calculated field. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Calculated	`OUTPUT`	[same as input]	Vector layer with the new calculated field

Код на Python

Algorithm ID: qgis:advancedpythonfieldcalculator

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.6. Drop field(s)

Takes a vector layer and generates a new one that has the same features but without the selected columns.

См.также

Retain fields

Параметры

Ярлык

Имя

Тип

Описание

Исходный слой

INPUT

[vector: any]

Input vector layer to drop field(s) from

Fields to drop

COLUMN

[tablefield: any] [list]

The field(s) to drop

Remaining fields

OUTPUT

[same as input]

Default: [Create temporary layer]

Specify the output vector layer with the remaining fields. One of:

Create Temporary Layer (TEMPORARY_OUTPUT)
Save to File…
Save to Geopackage…
Save to Database Table…
Append to Layer…

The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Remaining fields	`OUTPUT`	[same as input]	Vector layer with the remaining fields

Код на Python

Algorithm ID: native:deletecolumn

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.7. Explode HStore Field 

Creates a copy of the input layer and adds a new field for every unique key in the HStore field.

The expected field list is an optional comma separated list. If this list is specified, only these fields are added and the HStore field is updated. By default, all unique keys are added.

The PostgreSQL HStore is a simple key-value store used in PostgreSQL and GDAL (when reading an OSM file with the other_tags field.

Параметры

Ярлык	Имя	Тип	Описание
Исходный слой	`INPUT`	[vector: any]	Input vector layer
HStore field	`FIELD`	[tablefield: any]	The field(s) to drop
Expected list of fields separated by a comma Optional	`EXPECTED_FIELDS`	[string] Default: „“	Comma-separated list of fields to extract. The HStore field will be updated by removing these keys.
Exploded	`OUTPUT`	[same as input] Default: `[Create temporary layer]`	Specify the output vector layer. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Exploded	`OUTPUT`	[same as input]	Output vector layer

Код на Python

Algorithm ID: native:explodehstorefield

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.8. Extract binary field 

Extracts contents from a binary field, saving them to individual files. Filenames can be generated using values taken from an attribute in the source table or based on a more complex expression.

Параметры

Ярлык	Имя	Тип	Описание
Исходный слой	`INPUT`	[vector: any]	Input vector layer containing the binary data
Binary field	`FIELD`	[tablefield: any]	Field containing the binary data
File name	`FILENAME`	[expression]	Field or expression-based text to name each output file
Destination folder	`FOLDER`	[folder] Default: `[Save to temporary folder]`	Folder in which to store the output files. One of: Save to a Temporary Directory Save to Directory

Результаты

Ярлык	Имя	Тип	Описание
Folder	`FOLDER`	[folder]	The folder that contains the output files.

Код на Python

Algorithm ID: native:extractbinary

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.9. Field calculator 

Opens the field calculator (see Expressions). You can use all the supported expressions and functions.

A new layer is created with the result of the expression.

The field calculator is very useful when used in The model designer.

Параметры

Ярлык	Имя	Тип	Описание
Исходный слой	`INPUT`	[vector: any]	The layer to calculate on
Output field name	`FIELD_NAME`	[string]	The name of the field for the results
Output field type	`FIELD_TYPE`	[enumeration] Default: 0	The type of the field. One of: 0 — Decimal (double) 1 — Integer (32 bit) 2 — Text (string) 3 — Date 4 — Time 5 — Date & Time 6 — Boolean 7 — Binary Object (BLOB) 8 — String List 9 — Integer List 10 — Decimal (double) List
Output field width	`FIELD_LENGTH`	[number] Default: 10	The length of the result field (minimum 0)
Field precision	`FIELD_PRECISION`	[number] Default: 3	The precision of the result field (minimum 0, maximum 15)
Create new field	`NEW_FIELD`	[логическое значение] Default: True	Should the result field be a new field
Formula	`FORMULA`	[expression]	The formula to use to calculate the result
Output file	`OUTPUT`	[vector: any] Default: `[Create temporary layer]`	Specification of the output layer. Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… Append to Layer… The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Calculated	`OUTPUT`	[vector: any]	Output layer with the calculated field values

Код на Python

Algorithm ID: native:fieldcalculator

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.10. Refactor fields 

Allows editing the structure of the attribute table of a vector layer.

Fields can be modified in their type and name, using a fields mapping.

The original layer is not modified. A new layer is generated, which contains a modified attribute table, according to the provided fields mapping.

Примечание

When using a template layer with constraints on fields, the information is displayed in the widget with a coloured background and tooltip. Treat this information as a hint during configuration. No constraints will be added on an output layer nor will they be checked or enforced by the algorithm.

The Refactor fields algorithm allows to:

Change field names and types
Add and remove fields
Reorder fields
Calculate new fields based on expressions
Load field list from another layer

../../../../_images/refactor_fields.png — Рис. 28.135 Refactor fields dialog

Параметры

Ярлык

Имя

Тип

Описание

Исходный слой

INPUT

[vector: any]

The layer to modify

Fields mapping

FIELDS_MAPPING

[list]

List of output fields with their definitions. The embedded table lists all the fields of the source layer and allows you to edit them:

Click to create a new field.
Click to remove a field.
Use and to change the selected field order.
Click to reset to the default view.
Click to invert the selection in the fields list.

For each of the fields you’d like to reuse, you need to fill the following options:

Source expression (expression) [expression]: Field or expression from the input layer.
Field name (name) [string]: Name of the field in the output layer. By default input field name is kept.
Type (type) [enumeration]: Data type of the output field. Available types depend on the output layer provider.
Length (length) [number]: Length of the output field.
Precision (precision) [number]: Precision of the output field.
Constraints (constraints) [string]: When using a template layer, indicates whether there are constraints applied to the template field. Hover over the cell to display the constraints.
Field alias (field_alias) [string] NEW in 3.32: Set a name to use as alias for the field. Not supported by all format types. Existing aliases are displayed and will be copied to the destination layer if supported.
Field comment (field_comment) [string] NEW in 3.32: Store a comment describing the field. Not supported by all format types. Existing comments are displayed and will be copied to the destination layer if supported.
Load fields from template layer: Allows to select a layer from the current project as a template and (with Load fields) fill the above «Fields mapping» options with its fields and their definitions.

Refactored

OUTPUT

[vector: any]

Default: [Create temporary layer]

Specification of the output layer. One of:

Create Temporary Layer (TEMPORARY_OUTPUT)
Save to File…
Save to Geopackage…
Save to Database Table…
Append to Layer…

The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Refactored	`OUTPUT`	[vector: any]	Output layer with refactored fields

Код на Python

Algorithm ID: native:refactorfields

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.11. Rename field 

Renames an existing field from a vector layer.

The original layer is not modified. A new layer is generated where the attribute table contains the renamed field.

См.также

Refactor fields

Параметры

Ярлык	Имя	Тип	Описание
Исходный слой	`INPUT`	[vector: any]	The input vector layer
Field to rename	`FIELD`	[tablefield: any]	The field to be altered
New field name	`NEW_NAME`	[string]	The new field name
Renamed	`OUTPUT`	[vector: same as input] Default: `[Create temporary layer]`	Specification of the output layer. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… Append to Layer… The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Renamed	`OUTPUT`	[vector: same as input]	Output layer with the renamed field

Код на Python

Algorithm ID: qgis:renametablefield

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.12. Retain fields 

Takes a vector layer and generates a new one that retains only the selected fields. All other fields will be dropped.

См.также

Drop field(s)

Параметры

Ярлык

Имя

Тип

Описание

Исходный слой

INPUT

[vector: any]

The input vector layer

Fields to retain

FIELDS

[tablefield: any] [list]

List of fields to keep in the layer

Retained fields

OUTPUT

[vector: same as input]

Default: [Create temporary layer]

Specification of the output layer. One of:

Create Temporary Layer (TEMPORARY_OUTPUT)
Save to File…
Save to Geopackage…
Save to Database Table…
Append to Layer…

The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Retained fields	`OUTPUT`	[vector: same as input]	Output layer with the retained fields

Код на Python

Algorithm ID: native:retainfields

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.

28.1.25.13. Text to float 

Modifies the type of a given attribute in a vector layer, converting a text attribute containing numeric strings into a numeric attribute (e.g. „1“ to 1.0).

The algorithm creates a new vector layer so the source one is not modified.

If the conversion is not possible the selected column will have NULL values.

Параметры

Ярлык

Имя

Тип

Описание

Исходный слой

INPUT

[vector: any]

The input vector layer.

Text attribute to convert to float

FIELD

[tablefield: string]

The string field for the input layer that is to be converted to a float field.

Float from text

OUTPUT

[same as input]

Default: [Create Temporary Layer]

Specify the output layer. One of:

Create Temporary Layer (TEMPORARY_OUTPUT)
Save to File…
Save to Geopackage…
Save to Database Table…
Append to Layer…

The file encoding can also be changed here.

Результаты

Ярлык	Имя	Тип	Описание
Float from text	`OUTPUT`	[same as input]	Output vector layer with the string field converted into a float field

Код на Python

Algorithm ID: qgis:texttofloat

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

ID алгоритма отображается при наведении мыши на алгоритм в Инструментах анализа. Словарь parameter dictionary содержит ключи параметров и их значения. См. Изпользование алгоритмов геообработки в консоли для детального описания того, как запускать алгоритмы анализа из консоли Python.