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24.1.13. Point Cloud Data Management

Informacja

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

24.1.13.1. Assign projection 

Assigns a Coordinate Reference System to a point cloud layer, if it is missing or wrong. A new layer is created.

Zobacz także

Reproject

Parametry

Etykieta

Nazwa

Typ

Opis

Warstwa wejściowa

INPUT

[point cloud]

Input point cloud layer to assign a CRS to

Desired CRS

CRS

[układ współrzędnych]

The CRS to apply to the layer

Warstwa wynikowa

OUTPUT

[point cloud]

Domyślnie: [Zapisz do pliku tymczasowego]

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

Zapisz do pliku tymczasowego
Zapisz do pliku…

Wyniki

Etykieta	Nazwa	Typ	Opis
Przekonwertowany	`OUTPUT`	[point cloud]	Output point cloud layer with a new CRS. Currently supported formats are `.LAS`, `.LAZ`, `.COPC.LAZ` and `.VPC`.

Kod pythona

ID algorytmu: pdal:assignprojection

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.

24.1.13.2. Build virtual point cloud (VPC)

Creates a virtual point cloud (VPC) from input point cloud data.

If you leave the optional parameters unchecked, the VPC file will be built very quickly as the algorithm will only read metadata of input files. With any of the optional parameters set, the algorithm will read all points which can take some time.

../../../../_images/point_cloud_buildvpc.png — Rys. 24.13 Generating Virtual Point Cloud with overview from a set of point cloud tiles

Zobacz także

Złącz

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwy wejściowe	`LAYERS`	[point cloud] [list]	Input point cloud layers to combine inside a virtual point cloud layer
Calculate boundary polygon	`BOUNDARY`	[wartość logiczna] Domyślnie: False	Set to True to show the exact boundaries of data (rather than just rectangular extent)
Calculate statistics	`STATISTICS`	[wartość logiczna] Domyślnie: False	Set to True to understand ranges of values of the various attributes
Build overview point cloud	`OVERVIEW`	[wartość logiczna] Domyślnie: False	Generates a single “thinned” point cloud of all the input data (using only every 1000th point from original data). The overview point cloud will be created next to the VPC file - for example, for `mydata.vpc`, the overview point cloud would be named `mydata-overview.copc.laz`.
Virtual point cloud	`OUTPUT`	[point cloud] Domyślnie: `[Zapisz do pliku tymczasowego]`	Specify the point cloud file to build the data into. One of: Zapisz do pliku tymczasowego Zapisz do pliku…

Wyniki

Etykieta	Nazwa	Typ	Opis
Virtual point cloud	`OUTPUT`	[raster]	Output point cloud layer combining all the input data, as a virtual file.

Kod pythona

ID algorytmu: pdal:virtualpointcloud

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.

24.1.13.3. Przytnij 

Clips a point cloud layer by a polygon layer so that the resulting point cloud contains only points within the polygons.

../../../../_images/point_cloud_clip.png — Rys. 24.14 Clipping an input point cloud layer with a polygon coverage

Parametry

Parametry podstawowe

Etykieta

Nazwa

Typ

Opis

Warstwa wejściowa

INPUT

[point cloud]

Input point cloud layer to clip

Clipping polygons

OVERLAY

[vector: polygon]

Polygon vector layer to use as coverage for clipping the points

Przycięte

OUTPUT

[point cloud]

Domyślnie: [Zapisz do pliku tymczasowego]

Specify the point cloud file to export the clipped points to. One of:

Zapisz do pliku tymczasowego
Zapisz do pliku…

Parametry zaawansowane

Etykieta

Nazwa

Typ

Opis

Filter expression

Opcjonalne

FILTER_EXPRESSION

[wyrażenie]

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

Cropping extent

Opcjonalne

FILTER_EXTENT

[zasięg]

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

Wyniki

Etykieta	Nazwa	Typ	Opis
Przycięte	`OUTPUT`	[raster]	Output point cloud whose features are the points within the coverage polygon layer.

Kod pythona

ID algorytmu: pdal:clip

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.

24.1.13.4. Create COPC 

Creates the index for all the input point cloud files in a batch mode.

Parametry

Etykieta

Nazwa

Typ

Opis

Warstwy wejściowe

LAYERS

[point cloud] [list]

Input point cloud layers to create an index for

Katalog wynikowy

Opcjonalne

OUTPUT

[folder]

Default: [Skip output]

Specify the folder to create the new files in. One of:

Pomiń wyjście
Zapisz do katalogu tymczasowego
Zapisz w katalogu

Wyniki

Etykieta	Nazwa	Typ	Opis
Katalog wynikowy	`OUTPUT`	[folder]	Output folder containing point cloud layers with accompanying COPC index files.

Kod pythona

ID algorytmu: pdal:createcopc

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.

24.1.13.5. Information 

Outputs basic metadata from an input point cloud file.

Example of output information:

LAS           1.4
point format  6
count         56736130
scale         0.001 0.001 0.001
offset        431749.999 5440919.999 968.898
extent        431250 5440420 424.266
              432249.999 5441419.999 1513.531
crs           ETRS89 / UTM zone 34N (N-E) (EPSG:3046)  (vertical CRS missing!)
units         horizontal=metre  vertical=unknown

Attributes:
- X floating 8
- Y floating 8
- Z floating 8
- Intensity unsigned 2
- ReturnNumber unsigned 1
- NumberOfReturns unsigned 1
- ScanDirectionFlag unsigned 1
- EdgeOfFlightLine unsigned 1
- Classification unsigned 1
- ScanAngleRank floating 4
- UserData unsigned 1
- PointSourceId unsigned 2
- GpsTime floating 8
- ScanChannel unsigned 1
- ClassFlags unsigned 1

Parametry

Etykieta

Nazwa

Typ

Opis

Warstwa wejściowa

INPUT

[point cloud]

Input point cloud layer to extract metadata information from

Layer information

OUTPUT

[plik]

Domyślnie: [Zapisz do pliku tymczasowego]

Specify the file to store the metadata information. One of:

Zapisz do pliku tymczasowego
Zapisz do pliku…

Wyniki

Etykieta	Nazwa	Typ	Opis
Layer information	`OUTPUT`	[wektor]	`HTML` file to store the metadata information.

Kod pythona

ID algorytmu: pdal:info

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.

24.1.13.6. Złącz 

Merges multiple point cloud files into a single one.

Zobacz także

Build virtual point cloud (VPC)

Parametry

Parametry podstawowe

Etykieta

Nazwa

Typ

Opis

Warstwy wejściowe

LAYERS

[point cloud] [list]

Input point cloud layers to merge into a single one

Złączone

OUTPUT

[point cloud]

Domyślnie: [Zapisz do pliku tymczasowego]

Specify the output point cloud merging input files. One of:

Zapisz do pliku tymczasowego
Zapisz do pliku…

Parametry zaawansowane

Etykieta

Nazwa

Typ

Opis

Filter expression

Opcjonalne

FILTER_EXPRESSION

[wyrażenie]

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

Cropping extent

Opcjonalne

FILTER_EXTENT

[zasięg]

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

Wyniki

Etykieta	Nazwa	Typ	Opis
Złączone	`OUTPUT`	[point cloud]	Output point cloud layer merging all the input files.

Kod pythona

ID algorytmu: pdal: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 Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.13.7. Reproject 

Reprojects a point cloud to a different Coordinate Reference System (CRS).

Zobacz także

Assign projection

Parametry

Etykieta

Nazwa

Typ

Opis

Warstwa wejściowa

INPUT

[point cloud]

Input point cloud layer to reproject to a different CRS

Target CRS

CRS

[układ współrzędnych]

The CRS to apply to the layer

Reprojected

OUTPUT

[point cloud]

Domyślnie: [Zapisz do pliku tymczasowego]

Specify the reprojected point cloud file. One of:

Zapisz do pliku tymczasowego
Zapisz do pliku…

Parametry zaawansowane

Etykieta

Nazwa

Typ

Opis

Coordinate operation

Opcjonalne

OPERATION

[datum]

The datum transformation to use to reproject the data between the origin and target systems.

Wyniki

Etykieta	Nazwa	Typ	Opis
REPROJECTED	`OUTPUT`	[point cloud]	Output point cloud layer in the target CRS.

Kod pythona

ID algorytmu: pdal:reproject

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.

24.1.13.8. Thin (by sampling radius)

Creates a thinned version of the point cloud by performing sampling by distance point (reduces the number of points within a certain radius).

../../../../_images/point_cloud_thin.gif — Rys. 24.15 Thining point cloud (by sampling radius)

Zobacz także

Thin (by skipping points)

Parametry

Parametry podstawowe

Etykieta

Nazwa

Typ

Opis

Warstwa wejściowa

INPUT

[point cloud]

Input point cloud layer to create a thinned version from

Sampling radius (in map units)

SAMPLING_RADIUS

[numeric: double]

Domyślnie: 1.0

Distance within which points are sampled to a unique point

Thinned (by radius)

OUTPUT

[point cloud]

Domyślnie: [Zapisz do pliku tymczasowego]

Specify the output point cloud with reduced points. One of:

Zapisz do pliku tymczasowego
Zapisz do pliku…

Parametry zaawansowane

Etykieta

Nazwa

Typ

Opis

Filter expression

Opcjonalne

FILTER_EXPRESSION

[wyrażenie]

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

Cropping extent

Opcjonalne

FILTER_EXTENT

[zasięg]

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

Wyniki

Etykieta	Nazwa	Typ	Opis
Thinned (by radius)	`OUTPUT`	[point cloud]	Output point cloud layer with reduced points.

Kod pythona

ID algorytmu: pdal:thinbyradius

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.

24.1.13.9. Thin (by skipping points)

Creates a thinned version of the point cloud by keeping only every N-th point (reduces the number of points by skipping nearby points).

Zobacz także

Thin (by sampling radius)

Parametry

Parametry podstawowe

Etykieta

Nazwa

Typ

Opis

Warstwa wejściowa

INPUT

[point cloud]

Input point cloud layer to create a thinned version from

Number of points to skip

POINTS_NUMBER

[numeric: integer]

Domyślnie: 1

Keep only every N-th point in the input layer

Thinned (by decimation)

OUTPUT

[point cloud]

Domyślnie: [Zapisz do pliku tymczasowego]

Specify the output point cloud with reduced points. One of:

Zapisz do pliku tymczasowego
Zapisz do pliku…

Parametry zaawansowane

Etykieta

Nazwa

Typ

Opis

Filter expression

Opcjonalne

FILTER_EXPRESSION

[wyrażenie]

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

Cropping extent

Opcjonalne

FILTER_EXTENT

[zasięg]

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

Wyniki

Etykieta	Nazwa	Typ	Opis
Thinned (by decimation)	`OUTPUT`	[point cloud]	Output point cloud layer with reduced points.

Kod pythona

ID algorytmu: pdal:thinbydecimate

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.

24.1.13.10. Tile 

Creates tiles from input point cloud files, recommended for best performance (in display or analysis) with such datasets in QGIS.

Zobacz także

Build virtual point cloud (VPC), Create COPC

Parametry

Parametry podstawowe

Etykieta

Nazwa

Typ

Opis

Warstwy wejściowe

LAYERS

[point cloud] [list]

Input point cloud layers to create tiles from

Tile length

LENGTH

[numeric: double]

Domyślnie: 1000.0

Size of the edge of each generated tile

Katalog wynikowy

OUTPUT

[folder]

Domyślnie: [Zapisz do katalogu tymczasowego]

Specify the folder to store the generated tiles. One of:

Zapisz do katalogu tymczasowego
Zapisz w katalogu

Parametry zaawansowane

Etykieta

Nazwa

Typ

Opis

Assign CRS

Opcjonalne

CRS

[układ współrzędnych]

The CRS to apply to the layer

Wyniki

Etykieta	Nazwa	Typ	Opis
Katalog wynikowy	`OUTPUT`	[folder]	Output folder containing the tiles generated from input files.

Kod pythona

ID algorytmu: pdal:tile

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.