24.2.6. Vector conversion

24.2.6.1. Convert format

Converts any OGR-supported vector layer into another OGR-supported format.

This algorithm is derived from the ogr2ogr utility.

參數

Label	名稱	Type	說明
Input layer	INPUT	[vector: any]	Input vector layer
Additional creation options Optional	OPTIONS	[string] Default: '' (no additional options)	Additional GDAL creation options.
Converted	OUTPUT	[same as input]	Specification of the output vector layer. One of: Save to a Temporary File Save to File... The file encoding can also be changed here. For Save to File, the output format has to be specified. All GDAL vector formats are supported. For Save to a Temporary File the QGIS default vector format will be used.

輸出

Label	名稱	Type	說明
Converted	OUTPUT	[same as input]	The output vector layer

Python code

Algorithm ID: gdal:convertformat

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.

24.2.6.2. Rasterize (overwrite with attribute)

Overwrites a raster layer with values from a vector layer. New values are assigned based on the attribute value of the overlapping vector feature.

This algorithm is derived from the GDAL rasterize utility.

參數

Label	名稱	Type	說明
Input layer	INPUT	[vector: any]	Input vector layer
Input raster layer	INPUT_RASTER	[raster]	Input raster layer
Field to use for a burn-in value Optional	FIELD	[tablefield: numeric]	Defines the attribute field to use to set the pixels values
Add burn in values to existing raster values	ADD	[boolean] Default: False	If False, pixels are assigned the selected field's value. If True, the selected field's value is added to the value of the input raster layer.
Additional command-line parameters Optional	EXTRA	[string] Default: ''	Add extra GDAL command line options

輸出

Label	名稱	Type	說明
Rasterized	OUTPUT	[raster]	The overwritten input raster layer

Python code

Algorithm ID: gdal:rasterize_over

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.

24.2.6.3. Rasterize (overwrite with fixed value)

Overwrites parts of a raster layer with a fixed value. The pixels to overwrite are chosen based on the supplied (overlapping) vector layer.

This algorithm is derived from the GDAL rasterize utility.

參數

Label	名稱	Type	說明
Input layer	INPUT	[vector: any]	Input vector layer
Input raster layer	INPUT_RASTER	[raster]	Input raster layer
A fixed value to burn	BURN	[number] Default: 0.0	The value to burn
Add burn in values to existing raster values	ADD	[boolean] Default: False	If False, pixels are assigned the fixed value. If True, the fixed value is added to the value of the input raster layer.
Additional command-line parameters Optional	EXTRA	[string] Default: ''	Add extra GDAL command line options

輸出

Label	名稱	Type	說明
Rasterized	OUTPUT	[raster]	The overwritten input raster layer

Python code

Algorithm ID: gdal:rasterize_over_fixed_value

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.

24.2.6.4. Rasterize (vector to raster)

Converts vector geometries (points, lines and polygons) into a raster image.

This algorithm is derived from the GDAL rasterize utility.

Default menu: Raster ► Conversion

參數

Label	名稱	Type	說明
Input layer	INPUT	[vector: any]	Input vector layer
Field to use for a burn-in value Optional	FIELD	[tablefield: numeric]	Defines the attribute field from which the attributes for the pixels should be chosen
A fixed value to burn Optional	BURN	[number] Default: 0.0	A fixed value to burn into a band for all features.
Output raster size units	UNITS	[enumeration] Default: 0	Units to use when defining the output raster size/resolution. One of: 0 --- Pixels 1 --- Georeferenced units
Width/Horizontal resolution	WIDTH	[number] Default: 0.0	Sets the width (if size units is "Pixels") or horizontal resolution (if size units is "Georeferenced units") of the output raster. Minimum value: 0.0.
Height/Vertical resolution	HEIGHT	[number] Default: 0.0	Sets the height (if size units is "Pixels") or vertical resolution (if size units is "Georeferenced units") of the output raster.
Output extent	EXTENT	[extent]	Extent of the output raster layer. If the extent is not specified, the minimum extent that covers the selected reference layer(s) will be used.
Assign a specified nodata value to output bands Optional	NODATA	[number] Default: 0.0	Assigns a specified nodata value to output bands
Additional creation options Optional	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). For Batch Process: separate multiple options with a pipe character (|).
Output data type	DATA_TYPE	[enumeration] Default: 5	Defines the format of the output raster file. 選項： 0 --- Byte 1 --- Int16 2 --- UInt16 3 --- UInt32 4 --- Int32 5 --- Float32 6 --- Float64 7 --- CInt16 8 --- CInt32 9 --- CFloat32 10 --- CFloat64
Pre-initialize the output image with value Optional	INIT	[number]	Pre-initializes the output image bands with this value. Not marked as the nodata value in the output file. The same value is used in all the bands.
Invert rasterization	INVERT	[boolean] Default: False	Burns the fixed burn value, or the burn value associated with the first feature into all parts of the image not inside the provided polygon.
Rasterized	OUTPUT	[raster] Default: '[Save to temporary file]'	Specification of the output raster layer. One of: Save to a Temporary File Save to File... The file encoding can also be changed here For Save to File, the output format has to be specified. All GDAL raster formats are supported. For Save to a Temporary File the QGIS default raster format will be used.

輸出

Label	名稱	Type	說明
Rasterized	OUTPUT	[raster]	Output raster layer

Python code

Algorithm ID: gdal:rasterize

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.