重要

Translation is a community effort you can join. This page is currently translated at 48.72%.

28.2.7. Vector geoprocessing

28.2.7.1. Buffer vectors 

Create buffers around the features of a vector layer.

参数

Basic parameters

标注	名称	类型	描述
输入图层	`INPUT`	[vector: any]	The input vector layer
Geometry column name	`GEOMETRY`	[string] Default: 'geometry'	The name of the input layer geometry column to use
Buffer distance	`DISTANCE`	[数字] Default: 10.0	Minimum: 0.0
Dissolve by attribute 可选	`FIELD`	[tablefield: any] Default: None	Field to use for dissolving
Dissolve results	`DISSOLVE`	[boolean] Default: False	If set, the result is dissolved. If no field is set for dissolving, all the buffers are dissolved into one feature.
Produce one feature for each geometry in any kind of geometry collection in the source file	`EXPLODE_COLLECTIONS`	[boolean] Default: False
Buffer	`OUTPUT`	[vector: polygon] 默认: `[保存到临时文件]`	Specify the output buffer layer. One of: 保存到临时文件保存到文件…

Advanced parameters

标注

名称

类型

描述

Additional creation options

可选

OPTIONS

[string]

Default: '' (no additional options)

Additional GDAL creation options.

输出

标注	名称	类型	描述
Buffer	`OUTPUT`	[vector: polygon]	The output buffer layer

Python代码

Algorithm ID: gdal:buffervectors

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

28.2.7.2. Clip vector by extent 

Clips any OGR-supported vector file to a given extent.

This algorithm is derived from the GDAL ogr2ogr utility.

参数

Basic parameters

标注

名称

类型

描述

输入图层

INPUT

[vector: any]

The input vector layer

Clip extent

EXTENT

[范围]

Defines the bounding box that should be used for the output vector file. It has to be defined in target CRS coordinates.

Available methods are:

Calculate from layer…: uses extent of a layer loaded in the current project
Calculate from layout map…: uses extent of a layout map item in the active project
Calculate from bookmark…: uses extent of a saved bookmark
Use map canvas extent
Draw on canvas: click and drag a rectangle delimiting the area to take into account
Enter the coordinates as xmin, xmax, ymin, ymax

Clipped (extent)

OUTPUT

[same as input]

默认: [保存到临时文件]

Specify the output (clipped) layer. One of:

保存到临时文件
保存到文件…

Advanced parameters

标注

名称

类型

描述

Additional creation options

可选

OPTIONS

[string]

Default: '' (no additional options)

Additional GDAL creation options.

输出

标注	名称	类型	描述
Clipped (extent)	`OUTPUT`	[same as input]	The output (clipped) layer. The default format is "ESRI Shapefile".

Python代码

Algorithm ID: gdal:clipvectorbyextent

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

28.2.7.3. Clip vector by mask layer 

Clips any OGR-supported vector layer by a mask polygon layer.

This algorithm is derived from the GDAL ogr2ogr utility.

参数

Basic parameters

标注

名称

类型

描述

输入图层

INPUT

[vector: any]

The input vector layer

Mask layer

MASK

[vector: polygon]

Layer to be used as clipping extent for the input vector layer.

Clipped (mask)

OUTPUT

[same as input]

默认: [保存到临时文件]

The output (masked) layer. One of:

保存到临时文件
保存到文件…

Advanced parameters

标注

名称

类型

描述

Additional creation options

可选

OPTIONS

[string]

Default: '' (no additional options)

Additional GDAL creation options.

输出

标注	名称	类型	描述
Clipped (mask)	`OUTPUT`	[same as input]	The output (masked) layer. The default format is "ESRI Shapefile".

Python代码

Algorithm ID: gdal:clipvectorbypolygon

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

28.2.7.4. 融合（dissolve）

Dissolve (combine) geometries that have the same value for a given attribute / field. The output geometries are multipart.

参数

Basic parameters

标注	名称	类型	描述
输入图层	`INPUT`	[vector: any]	The input layer to dissolve
Dissolve field 可选	`FIELD`	[tablefield: any]	The field of the input layer to use for dissolving
Geometry column name	`GEOMETRY`	[string] Default: 'geometry'	The name of the input layer geometry column to use for dissolving.
Dissolved	`OUTPUT`	[same as input] 默认: `[保存到临时文件]`	Specify the output layer. One of: 保存到临时文件保存到文件…

Advanced parameters

标注	名称	类型	描述
Produce one feature for each geometry in any kind of geometry collection in the source file	`EXPLODE_COLLECTIONS`	[boolean] Default: False	Produce one feature for each geometry in any kind of geometry collection in the source file
Keep input attributes	`KEEP_ATTRIBUTES`	[boolean] Default: False	Keep all attributes from the input layer
Count dissolved features	`COUNT_FEATURES`	[boolean] Default: False	Count the dissolved features and include it in the output layer.
Compute area and perimeter of dissolved features	`COMPUTE_AREA`	[boolean] Default: False	Compute the area and perimeter of dissolved features and include them in the output layer
Compute min/max/sum/mean for attribute	`COMPUTE_STATISTICS`	[boolean] Default: False	Calculate statistics (min, max, sum and mean) for the numeric attribute specified and include them in the output layer
Numeric attribute to calculate statistics on 可选	`STATISTICS_ATTRIBUTE`	[tablefield: numeric]	The numeric attribute to calculate statistics on
Additional creation options 可选	`OPTIONS`	[string] Default: '' (no additional options)	Additional GDAL creation options.

输出

标注	名称	类型	描述
Dissolved	`OUTPUT`	[same as input]	The output multipart geometry layer (with dissolved geometries)

Python代码

Algorithm ID: gdal:dissolve

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

28.2.7.5. Offset curve 

Offsets lines by a specified distance. Positive distances will offset lines to the left, and negative distances will offset them to the right.

参数

Basic parameters

标注	名称	类型	描述
输入图层	`INPUT`	[vector: line]	The input line layer
Geometry column name	`GEOMETRY`	[string] Default: 'geometry'	The name of the input layer geometry column to use
Offset distance (left-sided: positive, right-sided: negative)	`DISTANCE`	[数字] Default: 10.0
Offset curve	`OUTPUT`	[vector: line] 默认: `[保存到临时文件]`	Specify the output line layer. One of: 保存到临时文件保存到文件…

Advanced parameters

标注

名称

类型

描述

Additional creation options

可选

OPTIONS

[string]

Default: '' (no additional options)

Additional GDAL creation options.

输出

标注	名称	类型	描述
Offset curve	`OUTPUT`	[vector: line]	The output offset curve layer

Python代码

Algorithm ID: gdal:offsetcurve

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

28.2.7.6. One side buffer 

Creates a buffer on one side (right or left) of the lines in a line vector layer.

参数

Basic parameters

标注	名称	类型	描述
输入图层	`INPUT`	[vector: line]	The input line layer
Geometry column name	`GEOMETRY`	[string] Default: 'geometry'	The name of the input layer geometry column to use
Buffer distance	`DISTANCE`	[数字] Default: 10.0
Buffer side	`BUFFER_SIDE`	[enumeration] Default: 0	One of: 0 --- Right 1 --- Left
Dissolve by attribute 可选	`FIELD`	[tablefield: any] Default: None	Field to use for dissolving
Dissolve all results	`DISSOLVE`	[boolean] Default: False	If set, the result is dissolved. If no field is set for dissolving, all the buffers are dissolved into one feature.
Produce one feature for each geometry in any kind of geometry collection in the source file	`EXPLODE_COLLECTIONS`	[boolean] Default: False
One-sided buffer	`OUTPUT`	[vector: polygon] 默认: `[保存到临时文件]`	Specify the output buffer layer. One of: 保存到临时文件保存到文件…

Advanced parameters

标注

名称

类型

描述

Additional creation options

可选

OPTIONS

[string]

Default: '' (no additional options)

Additional GDAL creation options.

输出

标注	名称	类型	描述
One-sided buffer	`OUTPUT`	[vector: polygon]	The output buffer layer

Python代码

Algorithm ID: gdal:onesidebuffer

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

28.2.7.7. Points along lines 

Generates a point on each line of a line vector layer at a distance from start. The distance is provided as a fraction of the line length.

参数

Basic parameters

标注	名称	类型	描述
输入图层	`INPUT`	[vector: line]	The input line layer
Geometry column name	`GEOMETRY`	[string] Default: 'geometry'	The name of the input layer geometry column to use
Distance from line start represented as a fraction of line length	`DISTANCE`	[数字] Default: 0.5 (middle of the line)
Points along lines	`OUTPUT`	[vector: point] 默认: `[保存到临时文件]`	Specify the output point layer. One of: 保存到临时文件保存到文件…

Advanced parameters

标注

名称

类型

描述

Additional creation options

可选

OPTIONS

[string]

Default: '' (no additional options)

Additional GDAL creation options.

输出

标注	名称	类型	描述
Points along line	`OUTPUT`	[vector: point]	The output point layer

Python代码

Algorithm ID: gdal:pointsalonglines

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

28.2.7. Vector geoprocessing

28.2.7.1. Buffer vectors

参数

Basic parameters

Advanced parameters

输出

Python代码

28.2.7.2. Clip vector by extent

参数

Basic parameters

Advanced parameters

输出

Python代码

28.2.7.3. Clip vector by mask layer

参数

Basic parameters

Advanced parameters

输出

Python代码

28.2.7.4. 融合（dissolve）

参数

Basic parameters

Advanced parameters

输出

Python代码

28.2.7.5. Offset curve

参数

Basic parameters

Advanced parameters

输出

Python代码

28.2.7.6. One side buffer

参数

Basic parameters

Advanced parameters

输出

Python代码

28.2.7.7. Points along lines

参数

Basic parameters

Advanced parameters

输出

Python代码

28.2.7.1. Buffer vectors 

28.2.7.2. Clip vector by extent 

28.2.7.3. Clip vector by mask layer 

28.2.7.5. Offset curve 

28.2.7.6. One side buffer 

28.2.7.7. Points along lines 