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28.1.12. Point Cloud Conversion

NEW in 3.32

Nota

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.

Parâmetros

Label

Nome

Type

Descrição

Input layer

INPUT

[point cloud]

Input point cloud layer to convert

Converted

OUTPUT

[point cloud]

Default: [Save to temporary file]

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

  • Save to a Temporary File

  • Save to File…

Resultados

Label

Nome

Type

Descrição

Converted

OUTPUT

[point cloud]

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

Python code

Algorithm ID: pdal: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 Usando os algoritmos do processamento a partir da consola for details on how to run processing algorithms from the Python console.

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

Fig. 28.10 Raster output using Intensity attribute of points

Parâmetros

Basic parameters

Label

Nome

Type

Descrição

Input layer

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

[number]

Default: 1.0

Cell size of the output raster

Tile size for parallel runs

TILE_SIZE

[number]

Default: 1000

Exported

OUTPUT

[raster]

Default: [Save to temporary file]

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

  • Save to a Temporary File

  • Save to File…

Advanced parameters

Label

Nome

Type

Descrição

Filter expression

Opcional

FILTER_EXPRESSION

[expression]

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

Cropping extent

Opcional

FILTER_EXTENT

[extent]

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

Opcional

ORIGIN_X

[number]

Y origin of a tile for parallel runs

Opcional

ORIGIN_Y

[number]

Resultados

Label

Nome

Type

Descrição

Exported

OUTPUT

[raster]

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

Python code

Algorithm ID: pdal:exportraster

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 Usando os algoritmos do processamento a partir da consola for details on how to run processing algorithms from the Python console.

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.

Nota

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

Fig. 28.11 Terrain raster output generated by point cloud triangulation

Parâmetros

Basic parameters

Label

Nome

Type

Descrição

Input layer

INPUT

[point cloud]

Input point cloud layer to export

Resolution of the density raster

RESOLUTION

[number]

Default: 1.0

Cell size of the output raster

Tile size for parallel runs

TILE_SIZE

[number]

Default: 1000

Exported

OUTPUT

[raster]

Default: [Save to temporary file]

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

  • Save to a Temporary File

  • Save to File…

Advanced parameters

Label

Nome

Type

Descrição

Filter expression

Opcional

FILTER_EXPRESSION

[expression]

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

Cropping extent

Opcional

FILTER_EXTENT

[extent]

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

Opcional

ORIGIN_X

[number]

Y origin of a tile for parallel runs

Opcional

ORIGIN_Y

[number]

Resultados

Label

Nome

Type

Descrição

Exported (using triangulation)

OUTPUT

[raster]

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

Python code

Algorithm ID: pdal:exportrastertin

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 Usando os algoritmos do processamento a partir da consola for details on how to run processing algorithms from the Python console.

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

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

Parâmetros

Basic parameters

Label

Nome

Type

Descrição

Input layer

INPUT

[point cloud]

Input point cloud layer to export

Attribute

Opcional

ATTRIBUTE

[field] [list]

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

Exported

OUTPUT

[vector]

Default: [Save to temporary file]

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

  • Save to a Temporary File

  • Save to File…

Advanced parameters

Label

Nome

Type

Descrição

Filter expression

Opcional

FILTER_EXPRESSION

[expression]

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

Cropping extent

Opcional

FILTER_EXTENT

[extent]

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

Resultados

Label

Nome

Type

Descrição

Exported

OUTPUT

[vector]

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

Python code

Algorithm ID: pdal:exportvector

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 Usando os algoritmos do processamento a partir da consola for details on how to run processing algorithms from the Python console.