重要

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28.1.7. Layer tools

28.1.7.1. Export layer(s) information

Creates a polygon layer with features corresponding to the extent of selected layer(s).

Additional layer details (CRS, provider name, file path, layer name, subset filter, abstract and attribution) are attached as attributes to each feature.

参数

标注	名称	类型	描述
Input layers	LAYERS	[vector: any] [list]	Input vector layers to get information on.
Output	OUTPUT	[vector: polygon] Default: [Create temporary layer]	Specification of the output layer with information. One of: Create Temporary Layer (TEMPORARY_OUTPUT) 保存到文件… Save to Geopackage… Save to Database Table… 文件编码也可以在此更改。

输出

标注	名称	类型	描述
Output	OUTPUT	[vector: polygon]	Polygon vector layer showing extent of input layers and associated information in attributes.

Python代码

Algorithm ID: native:exportlayersinformation

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。

28.1.7.2. Export to spreadsheet

Exports the attributes of a selection of vector layers into a spreadsheet document or optionally appends them to an existing spreadsheet as additional sheets.

参数

标注	名称	类型	描述
Input layers	LAYERS	[vector: any] [list]	Input vector layers. The output spreadsheet will consist of a sheet, for each layer, that contains the attributes of this layer.
Use field aliases as column headings	USE_ALIAS	[boolean] Default: False	Use the field aliases from the attribute table for the spreadsheet.
Export formatted values instead of raw values	FORMATTED_VALUES	[boolean] Default: False	If True, exports the formatted, human readable values (e.g., from a value map or value relation) to the spreadsheet.
Overwrite existing spreadsheet	OVERWRITE	[boolean] Default: True	If the specified spreadsheet exists, setting this option to True will overwrite the existing spreadsheet. If this option is False and the spreadsheet exists, the layers will be appended as additional sheets.
Destination spreadsheet	OUTPUT	[file] 默认: [保存到临时文件]	Output spreadsheet with a sheet for every layer. One of: 保存到临时文件 保存到文件…

输出

标注	名称	类型	描述
Destination spreadsheet	OUTPUT	[file]	Spreadsheet with a sheet for every layer.
Layers within spreadsheet	OUTPUT_LAYERS	[list]	The list of sheets added to the spreadsheet.

Python代码

Algorithm ID: native:exporttospreadsheet

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。

28.1.7.3. Extract layer extent

Generates a vector layer with the minimum bounding box (rectangle with N-S orientation) that covers all the input features.

The output layer contains a single bounding box for the whole input layer.

图 28.7 In red the bounding box of the source layer

Default menu: Vector ► Research Tools

参数

标注	名称	类型	描述
Layer	INPUT	[layer]	Input layer
Extent	OUTPUT	[vector: polygon] Default: [Create temporary layer]	Specify the polygon vector layer for the output extent. One of: Create Temporary Layer (TEMPORARY_OUTPUT) 保存到文件… Save to Geopackage… Save to Database Table… 文件编码也可以在此更改。

输出

标注	名称	类型	描述
Extent	OUTPUT	[vector: polygon]	Output (polygon) vector layer with the extent (minimum bounding box)

Python代码

Algorithm ID: qgis:polygonfromlayerextent

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。