重要

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28.2.2. Raster conversion

28.2.2.1. gdal2xyz 

Converts raster data to XYZ ASCII file format.

参数

标注	名称	类型	描述
输入图层	`INPUT`	[栅格]	Raster layer to convert
Band number	`BAND`	[raster band] Default: The first band of the input layer	If the raster is multiband, choose the band you want to convert
Source NoData 可选	`NODATA_INPUT`	[数字] Default: None	Input pixel value to treat as "NoData" (GDAL >= 3.7).
Destination NoData 可选	`NODATA_OUTPUT`	[数字] Default: None	Assign specified "NoData" value to output (GDAL >= 3.7).
Do not output NoData values	`SKIP_NODATA`	[boolean] Default: False	Do not output "NoData" values (GDAL >= 3.3).
Output comma-separated values	`CSV`	[boolean] Default: False	Sets whether the output file should be of type comma-separated values (csv).
XYZ ASCII file	`OUTPUT`	[file] 默认: `[保存到临时文件]`	Specification of the output file. One of: 保存到临时文件保存到文件…

输出

标注	名称	类型	描述
XYZ ASCII file	`INPUT`	[table]	Table file containing the values exported from the raster band.

Python代码

Algorithm ID: gdal:gdal2xyz

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。

28.2.2.2. PCT to RGB 

Converts an 8 bit paletted image to a 24 bit RGB. It will convert a pseudocolor band from the input file to an RGB file of the desired format.

This algorithm is derived from the GDAL pct2rgb utility.

Default menu: Raster ► Conversion

参数

标注	名称	类型	描述
输入图层	`INPUT`	[栅格]	Input 8 bit raster image
Band number	`BAND`	[raster band] Default: The first band of the input layer	If the raster is multiband, choose the band you want to convert
Generate a RGBA file	`RGBA`	[boolean] Default: False	Sets whether the output file should be of type RGBA.
PCT to RGB	`OUTPUT`	[file] 默认: `[保存到临时文件]`	Specification of the output file. One of: 保存到临时文件保存到文件…

输出

标注	名称	类型	描述
PCT to RGB	`OUTPUT`	[栅格]	24 bit RGB raster image

Python代码

Algorithm ID: gdal:pcttorgb

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。

28.2.2.3. Polygonize (raster to vector)

Creates vector polygons for all connected regions of pixels in the raster sharing a common pixel value. Each polygon is created with an attribute indicating the pixel value of that polygon.

This algorithm is derived from the GDAL polygonize utility.

Default menu: Raster ► Conversion

参数

Basic parameters

标注	名称	类型	描述
输入图层	`INPUT`	[栅格]	Input raster layer
Band number	`BAND`	[raster band] Default: The first band of the input layer	If the raster is multiband, choose the band you want to use
Name of the field to create	`FIELD`	[string] Default: 'DN'	Specify the field name for the attributes of the connected regions.
Use 8-connectedness	`EIGHT_CONNECTEDNESS`	[boolean] Default: False	If not set, raster cells must have a common border to be considered connected (4-connected). If set, touching raster cells are also considered connected (8-connected).
Vectorized	`OUTPUT`	[vector: polygon] 默认: `[保存到临时文件]`	Specification of the output (polygon) vector 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 command-line parameters

可选

EXTRA

[string]

Default: None

Add extra GDAL command line options

输出

标注	名称	类型	描述
Vectorized	`OUTPUT`	[vector: polygon]	Output vector layer

Python代码

Algorithm ID: gdal:polygonize

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。

28.2.2.4. Rearrange bands 

Creates a new raster using selected band(s) from a given raster layer. The algorithm also makes it possible to reorder the bands for the newly-created raster.

This algorithm is derived from the GDAL translate utility.

参数

Basic parameters

标注

名称

类型

描述

输入图层

INPUT

[栅格]

Input raster layer

Selected band(s)

BANDS

[raster band] [list]

Default: None

Ordered list of the bands to use to create the new raster

Converted

OUTPUT

[栅格]

Default: [Save to temporary file]

Specification of the output raster. 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: ''

For adding one or more creation options that control the raster to be created (colors, block size, file compression...). For convenience, you can rely on predefined profiles (see GDAL driver options section).

Batch Process and Model Designer: separate multiple options with a pipe character (|).

Output data type

DATA_TYPE

[enumeration]

Default: 0

Defines the data type of the output raster file. Options:

0 --- Use Input Layer Data Type
1 --- Byte (Eight bit unsigned integer (quint8))
2 --- Int16 (Sixteen bit signed integer (qint16))
3 --- UInt16 (Sixteen bit unsigned integer (quint16))
4 --- UInt32 (Thirty two bit unsigned integer (quint32))
5 --- Int32 (Thirty two bit signed integer (qint32))
6 --- Float32 (Thirty two bit floating point (float))
7 --- Float64 (Sixty four bit floating point (double))
8 --- CInt16 (Complex Int16)
9 --- CInt32 (Complex Int32)
10 --- CFloat32 (Complex Float32)
11 --- CFloat64 (Complex Float64)
12 --- Int8 (Eight bit signed integer (qint8))

Available options depend on the GDAL version built with QGIS (see Help ► About menu)

输出

标注	名称	类型	描述
Converted	`OUTPUT`	[栅格]	Output raster layer with rearranged bands.

Python代码

Algorithm ID: gdal:rearrange_bands

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。

28.2.2.5. RGB to PCT 

Converts a 24 bit RGB image into a 8 bit paletted. Computes an optimal pseudo-color table for the given RGB-image using a median cut algorithm on a downsampled RGB histogram. Then it converts the image into a pseudo-colored image using the color table. This conversion utilizes Floyd-Steinberg dithering (error diffusion) to maximize output image visual quality.

If you want to classify a raster map and want to reduce the number of classes it can be helpful to downsample your image with this algorithm before.

This algorithm is derived from the GDAL rgb2pct utility.

Default menu: Raster ► Conversion

参数

标注

名称

类型

描述

输入图层

INPUT

[栅格]

Input (RGB) raster layer

Number of colors

NCOLORS

[数字]

Default: 2

The number of colors the resulting image will contain. A value from 2-256 is possible.

RGB to PCT

OUTPUT

[栅格]

默认: [保存到临时文件]

Specification of the output raster. One of:

保存到临时文件
保存到文件…

输出

标注	名称	类型	描述
RGB to PCT	`OUTPUT`	[栅格]	Output raster layer.

Python代码

Algorithm ID: gdal:rgbtopct

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。

28.2.2.6. Translate (convert format)

Converts raster data between different formats.

This algorithm is derived from the GDAL translate utility.

Default menu: Raster ► Conversion

参数

Basic parameters

标注	名称	类型	描述
输入图层	`INPUT`	[栅格]	Input raster layer
Override the projection of the output file 可选	`TARGET_CRS`	[crs]	Specify a projection for the output file
Assign a specified NoData value to output bands 可选	`NODATA`	[数字] Default: Not set	Defines the value to use for NoData in the output raster
Copy all subdatasets of this file to individual output files	`COPY_SUBDATASETS`	[boolean] Default: False	Create individual files for subdatasets
Converted	`OUTPUT`	[栅格] 默认: `[保存到临时文件]`	Specification of the output (translated) raster 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: ''

For adding one or more creation options that control the raster to be created (colors, block size, file compression...). For convenience, you can rely on predefined profiles (see GDAL driver options section).

Batch Process and Model Designer: separate multiple options with a pipe character (|).

Additional command-line parameters

可选

EXTRA

[string]

Default: None

Add extra GDAL command line options

Output data type

DATA_TYPE

[enumeration]

Default: 0

Defines the data type of the output raster file. Options:

0 --- Use Input Layer Data Type
1 --- Byte (Eight bit unsigned integer (quint8))
2 --- Int16 (Sixteen bit signed integer (qint16))
3 --- UInt16 (Sixteen bit unsigned integer (quint16))
4 --- UInt32 (Thirty two bit unsigned integer (quint32))
5 --- Int32 (Thirty two bit signed integer (qint32))
6 --- Float32 (Thirty two bit floating point (float))
7 --- Float64 (Sixty four bit floating point (double))
8 --- CInt16 (Complex Int16)
9 --- CInt32 (Complex Int32)
10 --- CFloat32 (Complex Float32)
11 --- CFloat64 (Complex Float64)
12 --- Int8 (Eight bit signed integer (qint8))

Available options depend on the GDAL version built with QGIS (see Help ► About menu)

输出

标注	名称	类型	描述
Converted	`OUTPUT`	[栅格]	Output (translated) raster layer.

Python代码

Algorithm ID: gdal:translate

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。

28.2.2. Raster conversion

28.2.2.1. gdal2xyz

参数

输出

Python代码

28.2.2.2. PCT to RGB

参数

输出

Python代码

28.2.2.3. Polygonize (raster to vector)

参数

Basic parameters

Advanced parameters

输出

Python代码

28.2.2.4. Rearrange bands

参数

Basic parameters

Advanced parameters

输出

Python代码

28.2.2.5. RGB to PCT

参数

输出

Python代码

28.2.2.6. Translate (convert format)

参数

Basic parameters

Advanced parameters

输出

Python代码

28.2.2.1. gdal2xyz 

28.2.2.2. PCT to RGB 

28.2.2.4. Rearrange bands 

28.2.2.5. RGB to PCT 