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28.1.12. Point Cloud Conversion

NEW in 3.32

备注

These algorithms are only available if QGIS uses the PDAL library version 2.5.0 or newer.

28.1.12.1. Convert format

Converts a point cloud to a different file format, e.g. creates a compressed .LAZ.

参数

标注

名称

类型

描述

输入图层

INPUT

[point cloud]

Input point cloud layer to convert

Converted

OUTPUT

[point cloud]

默认: [保存到临时文件]

Specify the point cloud file to use as output. One of:

  • 保存到临时文件

  • 保存到文件…

输出

标注

名称

类型

描述

Converted

OUTPUT

[point cloud]

Output point cloud layer in a modified file format. Currently supported formats are .LAS, .LAZ, .COPC.LAZ and .VPC.

Python代码

Algorithm ID: pdal:convertformat

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。

28.1.12.2. Export to raster

Exports point cloud data to a 2D raster grid having cell size of given resolution, writing values from the specified attribute.

../../../../_images/point_cloud_exportraster.png

图 28.10 Raster output using Intensity attribute of points

参数

Basic parameters

标注

名称

类型

描述

输入图层

INPUT

[point cloud]

Input point cloud layer to export

Attribute

ATTRIBUTE

[field] [enumeration]

A Field of the point cloud layer to extract the values from

Resolution of the density raster

RESOLUTION

[数字]

默认值：1.0

Cell size of the output raster

Tile size for parallel runs

TILE_SIZE

[数字]

Default: 1000

Exported

OUTPUT

[栅格]

默认: [保存到临时文件]

Specify the raster file to export the data to. One of:

  • 保存到临时文件

  • 保存到文件…

Advanced parameters

标注

名称

类型

描述

Filter expression

可选

FILTER_EXPRESSION

[expression]

A PDAL expression for selecting a subset of features in the point cloud data

Cropping extent

可选

FILTER_EXTENT

[范围]

A map extent for selecting a subset of features in the point cloud data

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

X origin of a tile for parallel runs

可选

ORIGIN_X

[数字]

Y origin of a tile for parallel runs

可选

ORIGIN_Y

[数字]

输出

标注

名称

类型

描述

Exported

OUTPUT

[栅格]

Output raster layer features of the point cloud layer are exported to. Currently supported format is .TIF.

Python代码

Algorithm ID: pdal:exportraster

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。

28.1.12.3. Export raster (using triangulation)

Exports point cloud data to a 2D raster grid using a triangulation of points and then interpolating cell values from triangles.

备注

Using this algorithm can be slower if you are dealing with a large dataset. If your point cloud is dense, you can export your ground points as a raster using the Export to raster algorithm.

../../../../_images/point_cloud_exportrastertin.png

图 28.11 Terrain raster output generated by point cloud triangulation

参数

Basic parameters

标注

名称

类型

描述

输入图层

INPUT

[point cloud]

Input point cloud layer to export

Resolution of the density raster

RESOLUTION

[数字]

默认值：1.0

Cell size of the output raster

Tile size for parallel runs

TILE_SIZE

[数字]

Default: 1000

Exported

OUTPUT

[栅格]

默认: [保存到临时文件]

Specify the raster file to export the data to. One of:

  • 保存到临时文件

  • 保存到文件…

Advanced parameters

标注

名称

类型

描述

Filter expression

可选

FILTER_EXPRESSION

[expression]

A PDAL expression for selecting a subset of features in the point cloud data

Cropping extent

可选

FILTER_EXTENT

[范围]

A map extent for selecting a subset of features in the point cloud data

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

X origin of a tile for parallel runs

可选

ORIGIN_X

[数字]

Y origin of a tile for parallel runs

可选

ORIGIN_Y

[数字]

输出

标注

名称

类型

描述

Exported (using triangulation)

OUTPUT

[栅格]

Output raster layer features of the point cloud layer are exported to. Currently supported format is .TIF.

Python代码

Algorithm ID: pdal:exportrastertin

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。

28.1.12.4. Export to vector

Exports point cloud data to a vector layer with 3D points (a GeoPackage), optionally with extra attributes.

../../../../_images/point_cloud_exportvector.png

图 28.12 Exporting point cloud (ground points) to a vector layer styled based on the elevation

参数

Basic parameters

标注

名称

类型

描述

输入图层

INPUT

[point cloud]

Input point cloud layer to export

Attribute

可选

ATTRIBUTE

[field] [list]

One or more fields of the point cloud layer to export with the points.

Exported

OUTPUT

[vector]

默认: [保存到临时文件]

Specify the vector file to export the data to. One of:

  • 保存到临时文件

  • 保存到文件…

Advanced parameters

标注

名称

类型

描述

Filter expression

可选

FILTER_EXPRESSION

[expression]

A PDAL expression for selecting a subset of features in the point cloud data

Cropping extent

可选

FILTER_EXTENT

[范围]

A map extent for selecting a subset of features in the point cloud data

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

输出

标注

名称

类型

描述

Exported

OUTPUT

[vector]

Output vector layer features of the point cloud layer are exported to. Currently supported format is .GPKG.

Python代码

Algorithm ID: pdal:exportvector

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。