25.2.4. Raster miscellaneous

Build overviews (pyramids)
Build virtual raster
gdal2tiles
Merge
Pansharpening
ラスタ計算機
Raster information
Retile
Tile index
Viewshed

25.2.4.1. Build overviews (pyramids)

概要（ピラミッド）を作成できるラスタレイヤのレンダリング時間を高速化します。概要とは、ズームのレベルに応じてQGISで使用される、そのデータの低解像度コピーです。

This algorithm is derived from the GDAL addo utility.

Default menu: Raster ► Miscellaneous

パラメーター

Basic parameters

ラベル

名前

タイプ

説明

Input layer

INPUT

[raster]

Input raster layer

Remove all existing overviews

CLEAN

[boolean]

Default: False

Removes existing overviews from the raster. By default these are not removed.

Advanced parameters

ラベル	名前	タイプ	説明
Overview levels	`LEVELS`	[string] Default: '2 4 8 16'	入力ラスターレイヤーの元の解像度によって算出概要レベルの数を定義します。デフォルトでは、4つのレベルが考慮されます。
Resampling method Optional	`RESAMPLING`	[enumeration] Default: 0	Calculates the overviews with a defined resampling method. Possible resampling methods are: 0 -- Nearest Neighbour (`nearest`) 1 -- Average (`average`) 2 -- Gaussian (`gauss`) 3 -- Cubic Convolution (`cubic`) 4 -- B-Spline Convolution (`cubicspline`) 5 -- Lanczos Windowed Sinc (`lanczos`) 6 -- Average MP (`average_mp`) 7 -- Average in Mag/Phase Space (`average_magphase`) 8 -- Mode (`mode`)
Overviews format Optional	`FORMAT`	[enumeration] Default: 0	The overviews can be stored internally, or externally as GTiff or ERDAS Imagine file. By default the overviews are stored in the output raster. Possible formats methods are: 0 -- Internal (if possible) 1 -- External (GTiff .ovr) 2 -- External (ERDAS Imagine .aux)
Additional command-line parameters Optional	`EXTRA`	[string] Default: None	Add extra GDAL command line options

出力

ラベル	名前	タイプ	説明
Pyramidized	`OUTPUT`	[raster]	Output raster layer with overviews

Python code

Algorithm ID: gdal:overviews

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 プロセシングアルゴリズムをコンソールから使う for details on how to run processing algorithms from the Python console.

25.2.4.2. Build virtual raster 

入力GDALでサポートされているラスターのリストのモザイクであるVRT（仮想データセット）を構築します。モザイクを使用すると、複数のラスターファイルをマージできます。

This algorithm is derived from the GDAL buildvrt utility.

Default menu: Raster ► Miscellaneous

パラメーター

Basic parameters

ラベル	名前	タイプ	説明
Input layers	`INPUT`	[raster] [list]	GDAL-supported raster layers.
Resolution	`RESOLUTION`	[enumeration] Default: 0	The output resolution of the mosaic. By default the average resolution of the raster files will be chosen. オプション: 0 --- Average (`average`) 1 --- Highest (`highest`) 2 --- Lowest (`lowest`)
Place each input file into a separate band	`SEPARATE`	[boolean] Default: False	With 'True' you can define that each raster file goes into a separated stacked band in the VRT band.
Allow projection difference	`PROJ_DIFFERENCE`	[boolean] Default: False	Allows that the output bands have different projections derived from the projection of the input raster layers.
Virtual	`OUTPUT`	[raster] Default: `[Save to temporary file]`	Specification of the output raster layer. One of: Save to a Temporary File Save to File…

Advanced parameters

ラベル	名前	タイプ	説明
Add alpha mask band to VRT when source raster has none	`ADD_ALPHA`	[boolean] Default: False	Adds an alpha mask band to the VRT when the source raster has none.
Override projection for the output file Optional	`ASSIGN_CRS`	[crs] Default: None	Overrides the projection for the output file. No reprojection is done.
Resampling algorithm	`RESAMPLING`	[enumeration] Default: 0	The resampling algorithm to be used Options: 0 --- Nearest Neighbour (`nearest`) 1 --- Bilinear (`bilinear`) 2 --- Cubic Convolution (`cubic`) 3 --- B-Spline Convolution (`cubicspline`) 4 --- Lanczos Windowed Sinc (`lanczos`) 5 --- Average (`average`) 6 --- Mode (`mode`)
Nodata value(s) for input bands (space separated) Optional	`SRC_NODATA`	[string] Default: None	Space separated Nodata value(s) for input band(s)
Additional command-line parameters	`EXTRA`	[string] Default: None	Add extra GDAL command line options

出力

ラベル	名前	タイプ	説明
Virtual	`OUTPUT`	[raster]	Output raster layer

Python code

Algorithm ID: gdal:buildvirtualraster

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 プロセシングアルゴリズムをコンソールから使う for details on how to run processing algorithms from the Python console.

25.2.4.3. gdal2tiles 

Generates a directory with small tiles and metadata, following the OSGeo Tile Map Service Specification. See also the OpenGIS Web Map Tile Service Implementation Standard. Simple web pages with viewers based on Google Maps, OpenLayers and Leaflet are generated as well. To explore your maps on-line in the web browser, you only need to upload the generated directory onto a web server.

This algorithm also creates the necessary metadata for Google Earth (KML SuperOverlay), in case the supplied map uses EPSG:4326 projection.

ESRI world files and embedded georeferencing is used during tile generation, but you can publish a picture without proper georeferencing too.

This algorithm is derived from the GDAL gdal2tiles utility.

パラメーター

Basic parameters

ラベル	名前	タイプ	説明
Input layer	`INPUT`	[raster]	GDAL-supported raster layer.
Tile cutting profile	`PROFILE`	[enumeration] Default: 0	One of: 0 --- Mercator (`mercator`) 1 --- Geodetic (`geodetic`) 2 --- Raster (`raster`)
Zoom levels to render Optional	`ZOOM`	[string] Default: ''
Web viewer to generate	`VIEWER`	[enumerate] Default: 0	One of: 0 --- All (`all`) 1 --- GoogleMaps (`google`) 2 --- OpenLayers (`openlayers`) 3 --- Leaflet (`leaflet`) 4 --- None (`none`)
Title of the map Optional	`TITLE`	[string] Default: ''
Copyright of the map	`COPYRIGHT`	[string] Default: ''
Output directory	`OUTPUT`	[folder] Default: `[Save to temporary folder]`	Specify the output folder for the tiles. One of: Save to a Temporary Directory Save to Directory

Advanced parameters

ラベル	名前	タイプ	説明
Resampling method	`RESAMPLING`	[enumeration] Default: 0	The resampling algorithm to be used Options: 0 --- Average (`average`) 1 --- Nearest neighbour (`near`) 2 --- Bilinear (`bilinear`) 3 --- Cubic (`cubic`) 4 --- Cubic spline (`cubicspline`) 5 --- Lanczos Windowed sinc (`lanczos`) 6 --- Antialias (`antialias`)
The spatial reference system used for the source input data Optional	`SOURCE_CRS`	[crs] Default: None
Transparency value to assign to the input data Optional	`NODATA`	[number] Default: 0.0
URL address where the generated tiles are going to be published Optional	`URL`	[string] Default: ''
Google Maps API key (http://code.google.com/apis/maps/signup.html) Optional	`GOOGLE_KEY`	[string] Default: ''	Your Google maps API key.
Bing Maps API key (https://www.bingmapsportal.com/) Optional	`BING_KEY`	[string] Default: ''	Your Bing maps API key.
Generate only missing files	`RESUME`	[boolean] Default: False
Generate KML for Google Earth	`KML`	[boolean] Default: False
Avoid automatic generation of KML files for EPSG:4326	`NO_KML`	[boolean] Default: False

出力

ラベル	名前	タイプ	説明
Output directory	`OUTPUT`	[folder]	The output folder (for the tiles)

Python code

Algorithm ID: gdal:gdal2tiles

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 プロセシングアルゴリズムをコンソールから使う for details on how to run processing algorithms from the Python console.

25.2.4.4. Merge 

簡単な方法でラスタファイルをマージします。ここでは、入力ラスタから擬似カラーテーブルを使用し、出力ラスタの種類を定義できます。すべての画像は同じ座標系でなければなりません。

This algorithm is derived from the GDAL merge utility.

Default menu: Raster ► Miscellaneous

パラメーター

Basic parameters

ラベル	名前	タイプ	説明
Input layers	`INPUT`	[raster] [list]	Input raster layers
Grab pseudocolor table from first layer	`PCT`	[boolean] Default: False	The pseudocolor table from the first layer will be used for the coloring
Place each input file into a separate band	`SEPARATE`	[boolean] Default: False	Place each input file into a separate band
Output data type	`DATA_TYPE`	[enumeration] Default: 5	Defines the format of the output raster file. Options: 0 --- Byte 1 --- Int16 2 --- UInt16 3 --- UInt32 4 --- Int32 5 --- Float32 6 --- Float64 7 --- CInt16 8 --- CInt32 9 --- CFloat32 10 --- CFloat64
Merged	`OUTPUT`	[raster] Default: `[Save to temporary file]`	Specification of the output raster layer. One of: Save to a Temporary File Save to File…

Advanced parameters

ラベル	名前	タイプ	説明
Input pixel value to treat as "nodata" Optional	`NODATA_INPUT`	[number] Default: None	Ignores pixels from files being merged in with this pixel value
Assign specified "nodata" value to output Optional	`NODATA_OUTPUT`	[number] Default: None	Assigns the 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 (`\|`).
Additional command-line parameters	`EXTRA`	[string] Default: None	Add extra GDAL command line options

出力

ラベル	名前	タイプ	説明
Merged	`OUTPUT`	[raster]	Output raster layer

Python code

Algorithm ID: gdal:merge

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 プロセシングアルゴリズムをコンソールから使う for details on how to run processing algorithms from the Python console.

25.2.4.5. Pansharpening 

Performs a pan-sharpening operation. It can create a "classic" output dataset (such as GeoTIFF), or a VRT dataset describing the pan-sharpening operation.

See GDAL Pansharpen.

パラメーター

Basic parameters

ラベル

名前

タイプ

説明

Spectral dataset

SPECTRAL

[raster]

Input (spectral) raster layer

Panchromatic dataset

PANCHROMATIC

[raster]

Input (panchromatic) raster layer

出力

OUTPUT

[raster]

Default: [Save to temporary file]

Specify the output (sharpened) raster layer. One of:

Save to a Temporary File
Save to File…

Advanced parameters

ラベル

名前

タイプ

説明

Resampling algorithm

RESAMPLING

[enumeration]

Default: 2

The resampling algorithm to be used Options:

0 --- Nearest Neighbour (nearest)
1 --- Bilinear (bilinear)
2 --- Cubic (cubic)
3 --- Cubic Spline (cubicspline)
4 --- Lanczos Windowed Sinc (lanczos)
5 --- Average (average)

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 (|).

Additional command-line parameters

Optional

EXTRA

[string]

Default: None

Add extra GDAL command line options

出力

ラベル	名前	タイプ	説明
出力	`OUTPUT`	[raster]	Output (sharpened) raster layer

Python code

Algorithm ID: gdal:pansharp

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 プロセシングアルゴリズムをコンソールから使う for details on how to run processing algorithms from the Python console.

25.2.4.6. ラスタ計算機 

Command line raster calculator with numpy syntax. Use any basic arithmetic supported by numpy arrays, such as +, -, *, and / along with logical operators, such as >. Note that all input rasters must have the same dimensions, but no projection checking is performed.

See the GDAL Raster Calculator utility docs.

参考

ラスタ計算機

パラメーター

Basic parameters

ラベル	名前	タイプ	説明
Input layer A	`INPUT_A`	[raster]	First input raster layer (mandatory)
Number of raster band for A	`BAND_A`	[raster band]	Band for input layer A (mandatory)
Input layer B Optional	`INPUT_B`	[raster] Default: None	Second input raster layer
Number of raster band for B Optional	`BAND_B`	[raster band]	Band for input layer B
Input layer C Optional	`INPUT_C`	[raster] Default: None	Third input raster layer
Number of raster band for C Optional	`BAND_C`	[raster band]	Band for input layer C
Input layer D Optional	`INPUT_D`	[raster] Default: None	Fourth input raster layer
Number of raster band for D Optional	`BAND_D`	[raster band]	Band for input layer D
Input layer E Optional	`INPUT_E`	[raster] Default: None	Fifth input raster layer
Number of raster band for E Optional	`BAND_E`	[raster band]	Band for input layer E
Input layer F Optional	`INPUT_F`	[raster]	Sixth input raster layer
Number of raster band for F Optional	`BAND_F`	[raster band] Default: None	Band for input layer F
*Calculation in gdalnumeric syntax using +-/ or any numpy array functions (i.e. logical_and())**	`FORMULA`	[string] Default: ''	The calculation formula. Examples: `A(A>0)` --- outputs the value of the raster A if the value of A is greater than 0. If not, outputs 0. `A(A>0 and A>B)`--- outputs the value of A if that value is bigger than 0 and bigger than the value of B. If not, outputs 0. `Alogical_or(A<=177,A>=185)` --- outputs the value of A if A <= 177 or A >= 185. If not, outputs 0. `sqrt(AA+B*B)` --- Outputs the square root of the sum of the value of A squared and the value of B squared.
Set output nodata value Optional	`NO_DATA`	[number] Default: None	Value to use for nodata
Output raster type	`RTYPE`	[enumeration] Default: 5	Defines the format of the output raster file. Options: 0 --- Byte 1 --- Int16 2 --- UInt16 3 --- UInt32 4 --- Int32 5 --- Float32 6 --- Float64
Calculated	`OUTPUT`	[raster] Default: `[Save to temporary file]`	Specify the output (calculated) raster layer. One of: Save to a Temporary File Save to File…

Advanced parameters

ラベル

名前

タイプ

説明

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 (|).

Additional command-line parameters

Optional

EXTRA

[string]

Default: ''

Add extra GDAL command line options

出力

ラベル	名前	タイプ	説明
Calculated	`OUTPUT`	[raster]	Output (calculated) raster layer

Python code

Algorithm ID: gdal:rastercalculator

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 プロセシングアルゴリズムをコンソールから使う for details on how to run processing algorithms from the Python console.

25.2.4.7. Raster information 

The gdalinfo program lists various information about a GDAL supported raster dataset.

This algorithm is derived from the GDAL info utility.

Default menu: Raster ► Miscellaneous

パラメーター

Basic parameters

ラベル	名前	タイプ	説明
Input layer	`INPUT`	[raster]	Input raster layer
Force computation of the actual min/max values for each band	`MIN_MAX`	[boolean] Default: False	Forces computation of the actual min/max values for each band in the dataset
Read and display image statistics (force computation if necessary)	`STATS`	[boolean] Default: False	Reads and displays image statistics. Forces computation if no statistics are stored in an image.
Suppress GCP info	`NO_GCP`	[boolean] Default: False	Suppresses ground control points list printing. It may be useful for datasets with huge amount of GCPs, such as L1B AVHRR or HDF4 MODIS which contain thousands of them.
Suppress metadata info	`NO_METADATA`	[boolean] Default: False	Suppresses metadata printing. Some datasets may contain a lot of metadata strings.
Layer information	`OUTPUT`	[html] Default: `[Save to temporary file]`	Specify the HTML file for output. One of: Save to a Temporary File Save to File…

Advanced parameters

ラベル

名前

タイプ

説明

Additional command-line parameters

Optional

EXTRA

[string]

Default: None

Add extra GDAL command line options

出力

ラベル	名前	タイプ	説明
Layer information	`OUTPUT`	[html]	The HTML file containing information about the input raster layer

Python code

Algorithm ID: gdal:gdalinfo

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 プロセシングアルゴリズムをコンソールから使う for details on how to run processing algorithms from the Python console.

25.2.4.8. Retile 

Retiles a set of input tiles. All the input tiles must be georeferenced in the same coordinate system and have a matching number of bands. Optionally pyramid levels are generated.

This algorithm is derived from the GDAL Retile utility.

パラメーター

Basic parameters

ラベル	名前	タイプ	説明
Input files	`INPUT`	[raster] [list]	The input raster files
Tile width	`TILE_SIZE_X`	[number] Default: 256	Width of the tiles in pixels (minimum 0)
Tile height	`TILE_SIZE_Y`	[number] Default: 256	Height of the tiles in pixels (minimum 0)
Overlap in pixels between consecutive tiles	`OVERLAP`	[number] Default: 0
Number of pyramid levels to build	`LEVELS`	[number] Default: 1	Minimum: 0
Output directory	`OUTPUT`	[folder] Default: `[Save to temporary folder]`	Specify the output folder for the tiles. One of: Save to a Temporary Directory Save to Directory
CSV file containing the tile(s) georeferencing information	`OUTPUT_CSV`	[file] Default: `[Skip output]`	Specify the output file for the tiles. One of: Skip Output Save to a Temporary File Save to File…

Advanced parameters

ラベル	名前	タイプ	説明
Source coordinate reference system Optional	`SOURCE_CRS`	[crs] Default: None
Resampling method	`RESAMPLING`	[enumeration] Default: 0	The resampling algorithm to be used Options: 0 --- Nearest Neighbour (`nearest`) 1 --- Bilinear (`bilinear`) 2 --- Cubic (`cubic`) 3 --- Cubic Spline (`cubicspline`) 4 --- Lanczos Windowed Sinc (`lanczos`)
Column delimiter used in the CSV file Optional	`DELIMITER`	[string] Default: ';'	Delimiter to use in the CSV file containing the tile(s) georeferencing information
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 (`\|`).
Additional command-line parameters Optional	`EXTRA`	[string] Default: ''	Add extra GDAL command line options
Output data type	`DATA_TYPE`	[enumeration] Default: 5	Defines the format of the output raster file. Options: 0 --- Byte 1 --- Int16 2 --- UInt16 3 --- UInt32 4 --- Int32 5 --- Float32 6 --- Float64 7 --- CInt16 8 --- CInt32 9 --- CFloat32 10 --- CFloat64
Build only the pyramids	`ONLY_PYRAMIDS`	[boolean] Default: False
Use separate directory for each tile row	`DIR_FOR_ROW`	[boolean] Default: False

出力

ラベル	名前	タイプ	説明
Output directory	`OUTPUT`	[folder]	The output folder for the tiles.
CSV file containing the tile(s) georeferencing information	`OUTPUT_CSV`	[file]	The CSV file with georeferencing information for the tiles.

Python code

Algorithm ID: gdal:retile

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 プロセシングアルゴリズムをコンソールから使う for details on how to run processing algorithms from the Python console.

25.2.4.9. Tile index 

各入力ラスタファイル、ファイル名を含む属性、およびラスタの外形のポリゴンジオメトリのレコードを持つベクタレイヤを作成します。この出力は、ラスタタイルインデックスとしてMapServerと共に使用するのに適しています。

This algorithm is derived from the GDAL Tile Index utility.

Default menu: Raster ► Miscellaneous

パラメーター

Basic parameters

ラベル	名前	タイプ	説明
Input files	`LAYERS`	[raster] [list]	The input raster files. Can be multiple files.
Field name to hold the file path to the indexed rasters	`PATH_FIELD_NAME` Optional	[string] Default: 'location'	The output field name to hold the file path/location to the indexed rasters.
Store absolute path to the indexed rasters	`ABSOLUTE_PATH`	[boolean] Default: False	Set whether the absolute path to the raster files is stored in the tile index file. By default the raster filenames will be put in the file exactly as they are specified in the command.
Skip files with different projection reference	`PROJ_DIFFERENCE`	[boolean] Default: False	Only files with same projection as files already inserted in the tile index will be inserted. Default does not check projection and accepts all inputs.
Tile index	`OUTPUT`	[vector: polygon] Default: `[Save to temporary file]`	Specify the polygon vector layer to write the index to. One of: Save to a Temporary File Save to File…

Advanced parameters

ラベル

名前

タイプ

説明

Transform geometries to the given CRS

Optional

TARGET_CRS

[crs]

Geometries of input files will be transformed to the specified target coordinate reference system. Default creates simple rectangular polygons in the same coordinate reference system as the input rasters.

The name of the field to store the SRS of each tile

Optional

CRS_FIELD_NAME

[string]

The name of the field to store the SRS of each tile

The format in which the CRS of each tile must be written

CRS_FORMAT

[enumeration]

Default: 0

Format for the CRS. One of:

0 -- Auto (AUTO)
1 -- Well-known text (WKT)
2 -- EPSG (EPSG)
3 -- Proj.4 (PROJ)

出力

ラベル	名前	タイプ	説明
Tile index	`OUTPUT`	[vector: polygon]	The polygon vector layer with the tile index.

Python code

Algorithm ID: gdal:tileindex

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 プロセシングアルゴリズムをコンソールから使う for details on how to run processing algorithms from the Python console.

25.2.4.10. Viewshed 

Calculates a viewshed raster from an input raster DEM using method defined in Wang2000 for a user defined point.

パラメーター

Basic parameters

ラベル	名前	タイプ	説明
Input layer	`INPUT`	[raster]	Input elevation raster layer
Band number	`BAND`	[raster band] Default: 1	The number of the band to use as elevation
Observer location	`OBSERVER`	[point]	The location of the observer
Observer height	`OBSERVER_HEIGHT`	[number] Default: 1.0	The altitude of the observer, in the DEM units
Target height	`TARGET_HEIGHT`	[number] Default: 1.0	The altitude of the target element, in the DEM units
Maximum distance from observer to compute visibility	`MAX_DISTANCE`	[number] Default: 100.0	Maximum distance from observer to compute visibility, in the DEM units
出力	`OUTPUT`	[raster] Default: `[Save to temporary file]`	Output raster layer. One of: Save to a Temporary File Save to File…

Advanced parameters

ラベル

名前

タイプ

説明

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 (|).

Additional command-line parameters

EXTRA

[string]

Default: None

Add extra GDAL command line options

出力

ラベル	名前	タイプ	説明
出力	`OUTPUT`	[raster]	The raster layer displaying the viewshed.

Python code

Algorithm ID: gdal:viewshed

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 プロセシングアルゴリズムをコンソールから使う for details on how to run processing algorithms from the Python console.