27.1.14. 栅格工具

27.1.14.1. 将地图转换为栅格 

Creates a raster image of map canvas content.

A map theme can be selected to render a predetermined set of layers with a defined style for each layer.

Alternatively, a single layer can be selected if no map theme is set.

If neither map theme nor layer is set, the current map content will be rendered. The minimum extent entered will internally be extended to be a multiple of the tile size.

参数

标注	名称	类型	描述
Minimum extent to render (xmin, xmax, ymin, ymax)	`EXTENT`	[范围]	Specify the extent of the output raster layer. It will internally be extended to a multiple of the tile size. 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`
瓦片尺寸	`TILE_SIZE`	[数字] 默认值: 1024	Size of the tile of the output raster layer. Minimum value: 64.
Map units per pixel	`MAP_UNITS_PER_PIXEL`	[数字] Default: 100.0	Pixel size (in map units). Minimum value: 0.0
Make background transparent	`MAKE_BACKGROUND_TRANSPARENT`	[boolean] Default: False	Allows exporting the map with a transparent background. Outputs an RGBA (instead of RGB) image if set to `True`.
Map theme to render 可选	`MAP_THEME`	[enumeration]	Use an existing map theme for the rendering.
Single layer to render 可选	`LAYER`	[enumeration]	Choose a single layer for the rendering
Output layer	`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
Output layer	`OUTPUT`	[栅格]	Output raster layer

Python代码

Algorithm ID: native:rasterize

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。

27.1.14.2. Fill NoData cells 

Resets the NoData values in the input raster to a chosen value, resulting in raster dataset with no NoData pixels.

The algorithm respects the input raster data type, e.g. a floating point fill value will be truncated when applied to an integer raster.

../../../../_images/fill_nodata.png — 图 27.30 Filling NoData values (in grey) of a raster

参数

标注	名称	类型	描述
输入栅格	`INPUT`	[栅格]	The raster to process.
Band number	`BAND`	[数字] Default: 1	The band of the raster
Fill value	`FILL_VALUE`	[数字] 默认值：1.0	Set the value to use for the NoData pixels
Output raster	`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
Output raster	`OUTPUT`	[栅格]	The output raster layer with filled data cells.

Python代码

Algorithm ID: native:fillnodata

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。

27.1.14.3. Generate XYZ tiles (Directory)

Generates raster “XYZ” tiles using the current QGIS project as individual images to a directory structure.

参数

标注	名称	类型	描述
Extent (xmin, xmax, ymin, ymax)	`EXTENT`	[范围]	Specify the extent of the tiles. It will internally be extended to a multiple of the tile size. 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`
Minimum zoom	`ZOOM_MIN`	[数字] Default: 12	Minimum 0, maximum 25.
Maximum zoom	`ZOOM_MAX`	[数字] Default: 12	Minimum 0, maximum 25.
DPI	`DPI`	[数字] Default: 96	Minimum 48, maximum 600.
Background color 可选	`BACKGROUND_COLOR`	[color] Default: QColor(0, 0, 0, 0)	Choose the background color for the tiles
Tile format	`TILE_FORMAT`	[enumeration] Default: 0	One of: 0 --- PNG 1 --- JPG
Quality (JPG only) 可选	`QUALITY`	[数字] Default: 75	Minimum 1, maximum 100.
Metatile size 可选	`METATILESIZE`	[数字] Default: 4	Specify a custom metatile size when generating XYZ tiles. Larger values may speed up the rendering of tiles and provide better labelling (fewer gaps without labels) at the expense of using more memory. Minimum 1, maximum 20.
Tile width 可选	`TILE_WIDTH`	[数字] Default: 256	Minimum 1, maximum 4096.
Tile height 可选	`TILE_HEIGHT`	[数字] Default: 256	Minimum 1, maximum 4096.
Use inverted tile Y axis (TMS conventions) 可选	`TMS_CONVENTION`	[boolean] Default: False
Output directory 可选	`OUTPUT_DIRECTORY`	[folder] Default: `[Save to temporary folder]`	Specification of the output directory (for the tiles). One of: Skip Output Save to a Temporary Directory Save to Directory
Output html (Leaflet) 可选	`OUTPUT_HTML`	[html] 默认: `[保存到临时文件]`	Specification of the output HTML file. One of: Skip Output 保存到临时文件保存到文件…

输出

标注	名称	类型	描述
Output directory	`OUTPUT_DIRECTORY`	[folder]	Output directory (for the tiles)
Output html (Leaflet)	`OUTPUT_HTML`	[html]	The output HTML (Leaflet) file

Python代码

Algorithm ID: qgis:tilesxyzdirectory

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。

27.1.14.4. Generate XYZ tiles (MBTiles)

Generates raster “XYZ” tiles using the current QGIS project as a single file in the “MBTiles” format.

参数

标注	名称	类型	描述
Extent (xmin, xmax, ymin, ymax)	`EXTENT`	[范围]	Specify the extent of the tiles. It will internally be extended to a multiple of the tile size. 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`
Minimum zoom	`ZOOM_MIN`	[数字] Default: 12	Minimum 0, maximum 25.
Maximum zoom	`ZOOM_MAX`	[数字] Default: 12	Minimum 0, maximum 25.
DPI	`DPI`	[数字] Default: 96	Minimum 48, maximum 600.
Background color 可选	`BACKGROUND_COLOR`	[color] Default: QColor(0, 0, 0, 0)	Choose the background color for the tiles
Tile format	`TILE_FORMAT`	[enumeration] Default: 0	One of: 0 --- PNG 1 --- JPG
Quality (JPG only) 可选	`QUALITY`	[数字] Default: 75	Minimum 1, maximum 100.
Metatile size 可选	`METATILESIZE`	[数字] Default: 4	Specify a custom metatile size when generating XYZ tiles. Larger values may speed up the rendering of tiles and provide better labelling (fewer gaps without labels) at the expense of using more memory. Minimum 1, maximum 20.
Output file (for MBTiles)	`OUTPUT_FILE`	[file] 默认: `[保存到临时文件]`	Specification of the output file. One of: Skip Output 保存到临时文件保存到文件…

输出

标注	名称	类型	描述
Output file (for MBTiles)	`OUTPUT_FILE`	[file]	The output file.

Python代码

Algorithm ID: qgis:tilesxyzmbtiles

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。

27.1.14. 栅格工具

27.1.14.1. 将地图转换为栅格

参数

输出

Python代码

27.1.14.2. Fill NoData cells

参数

输出

Python代码

27.1.14.3. Generate XYZ tiles (Directory)

参数

输出

Python代码

27.1.14.4. Generate XYZ tiles (MBTiles)

参数

输出

Python代码

27.1.14.1. 将地图转换为栅格 

27.1.14.2. Fill NoData cells 