23.2.1. Analisi raster

23.2.1.1. Aspect

Generates an aspect map from any GDAL-supported elevation raster. Aspect is the compass direction that a slope faces. The pixels will have a value from 0-360° measured in degrees from north indicating the azimuth. On the northern hemisphere, the north side of slopes is often shaded (small azimuth from 0°-90°), while the southern side receives more solar radiation (higher azimuth from 180°-270°).

This algorithm is derived from the GDAL DEM utility.

Default menu: Raster ‣ Analysis

23.2.1.1.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Livello in ingresso

IN INGRESSO

[raster]

Input elevation raster layer

Band number

BAND

[raster band]

Default: 1

The number of the band to use as elevation

Return trigonometric angle instead of azimuth

TRIG_ANGLE

[boolean]

Default: False

Activating the trigonometric angle results in different categories: 0° (East), 90° (North), 180° (West), 270° (South).

Return 0 for flat instead of -9999

ZERO_FLAT

[boolean]

Default: False

Activating this option will insert a 0-value for the value -9999 on flat areas.

Compute edges

COMPUTE_EDGES

[boolean]

Default: False

Generates edges from the elevation raster

Use Zevenbergen&Thorne formula instead of the Horn’s one

ZEVENBERGEN

[boolean]

Default: False

Activates Zevenbergen&Thorne formula for smooth landscapes

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Aspect

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[raster]

Default: [Save to temporary file]

Output raster layer. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.1.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Aspect

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[raster]

Output raster with angle values in degrees

23.2.1.1.3. Python code

Algorithm ID: gdal:aspect

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.2. Color relief

Generates a color relief map from any GDAL-supported elevation raster. Color reliefs can particularly be used to depict elevations. The Algorithm outputs a 4-band raster with values computed from the elevation and a text-based color configuration file. By default, the colors between the given elevation values are blended smoothly and the result is a nice colorized elevation raster.

This algorithm is derived from the GDAL DEM utility.

23.2.1.2.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Livello in ingresso

IN INGRESSO

[raster]

Input elevation raster layer

Band number

BAND

[raster band]

Default: 1

The number of the band to use as elevation

Compute edges

COMPUTE_EDGES

[boolean]

Default: False

Generates edges from the elevation raster

Color configuration file

COLOR_TABLE

[file]

A text-based color configuration file

Matching mode

MATCH_MODE

[numero]

Default: 2

One of:

  • 0 — Use strict color matching

  • 1 — Use closest RGBA quadruples

  • 2 — Use smoothly blended colours

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Color relief

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[raster]

Default: [Save to temporary file]

Output raster layer. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.2.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Color relief

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[raster]

A 4-band output raster

23.2.1.2.3. Python code

Algorithm ID: gdal:colorrelief

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.3. Fill nodata

Fill raster regions with no data values by interpolation from edges. The values for the no-data regions are calculated by the sourrounding pixel values using inverse distance weighting. After the interpolation a smoothing of the results takes placce. Input can be any GDAL-supported raster layer. This algorithm is generally suitable for interpolating missing regions of fairly continuously varying rasters (such as elevation models for instance). It is also suitable for filling small holes and cracks in more irregularly varying images (like airphotos). It is generally not so great for interpolating a raster from sparse point data.

This algorithm is derived from the GDAL fillnodata utility.

Default menu: Raster ‣ Analysis

23.2.1.3.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Livello in ingresso

IN INGRESSO

[raster]

Input raster layer

Band number

BAND

[raster band]

Default: 1

The band to operate on. Nodata values must be represented by the value 0.

Maximum distance (in pixels) to search out for values to interpolate

DISTANCE

[numero]

Default: 10

The number of pixels to search in all directions to find values to interpolate from

Number of smoothing iterations to run after the interpolation

ITERATIONS

[numero]

Predefinito: 0

The number of 3x3 filter passes to run (0 or more) to smoothen the results of the interpolation.

Do not use default validity mask for the input band

NO_MASK

[boolean]

Default: False

Activates the user-defined validity mask

Validity mask

MASK_LAYER

[raster]

A raster layer that defines the areas to fill.

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Filled

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[raster]

Default: [Save to temporary file]

Specification of the output raster layer. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.3.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Filled

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[raster]

Output raster

23.2.1.3.3. Python code

Algorithm ID: gdal:fillnodata

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.4. Grid (Data metrics)

Computes some data metrics using the specified window and output grid geometry.

This algorithm is derived from the GDAL grid utility.

Default menu: Raster ‣ Analysis

Vedi anche

GDAL grid tutorial

23.2.1.4.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Vettore di punti

IN INGRESSO

[vettore: punto]

Input point vector layer

Data metric to use

METRIC

[numero]

Predefinito: 0

One of:

  • 0 — Minimum, minimum value found in grid node search ellipse

  • 1 — Maximum, maximum value found in grid node search ellipse

  • 2 — Range, a difference between the minimum and maximum values found in grid node search ellipse

  • 3 — Count, a number of data points found in grid node search ellipse

  • 4 — Average distance, an average distance between the grid node (center of the search ellipse) and all of the data points found in grid node search ellipse

  • 5 — Average distance between points, an average distance between the data points found in grid node search ellipse. The distance between each pair of points within ellipse is calculated and average of all distances is set as a grid node value

The first radius of search ellipse

RADIUS_1

[numero]

Default: 0.0

The first radius (X axis if rotation angle is 0) of the search ellipse

The second radius of search ellipse

RADIUS_2

[numero]

Default: 0.0

The second radius (Y axis if rotation angle is 0) of the search ellipse

Angle of search ellipse rotation in degrees (counter clockwise)

ANGLE

[numero]

Default: 0.0

Angle of ellipse rotation in degrees. Ellipse rotated counter clockwise.

Minimum number of data points to use

MIN_POINTS

[numero]

Default: 0.0

Minimum number of data points to average. If less amount of points found the grid node considered empty and will be filled with NODATA marker.

Nodata

NODATA

[numero]

Default: 0.0

No data marker to fill empty points

Z value from field

Optional

Z_FIELD

[tablefield: numeric]

Field for the interpolation

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Output data type

DATA_TYPE

[numero]

Predefinito: 5

Defines the data type 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

Interpolated (data metrics)

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[raster]

Default: [Save to temporary file]

Specify the output raster layer with interpolated values. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.4.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Interpolated (data metrics)

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[raster]

Output raster with interpolated values

23.2.1.4.3. Python code

Algorithm ID: gdal:griddatametrics

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.5. Grid (IDW with nearest neighbor searching)

Computes the Inverse Distance to a Power gridding combined to the nearest neighbor method. Ideal when a maximum number of data points to use is required.

This algorithm is derived from the GDAL grid utility.

Vedi anche

GDAL grid tutorial

23.2.1.5.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Vettore di punti

IN INGRESSO

[vettore: punto]

Input point vector layer

Weighting power

POWER

[numero]

Default: 2.0

Weighting power

Smoothing

SMOOTHING

[numero]

Default: 0.0

Smoothing parameter

The radius of the search circle

RAGGIO

[numero]

Default: 1.0

The radius of the search circle

Maximum number of data points to use

MAX_POINTS

[numero]

Default: 12

Do not search for more points than this number.

Minimum number of data points to use

MIN_POINTS

[numero]

Predefinito: 0

Minimum number of data points to average. If less amount of points found the grid node considered empty and will be filled with NODATA marker.

Nodata

NODATA

[numero]

Default: 0.0

No data marker to fill empty points

Z value from field

Optional

Z_FIELD

[tablefield: numeric]

Field for the interpolation

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Output data type

DATA_TYPE

[numero]

Predefinito: 5

Defines the data type 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

Interpolated (IDW with NN search)

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[raster]

Default: [Save to temporary file]

Specify the output raster layer with interpolated values. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.5.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Interpolated (IDW with NN search)

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[raster]

Output raster with interpolated values

23.2.1.5.3. Python code

Algorithm ID: gdal:gridinversedistancenearestneighbor

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.6. Grid (Inverse distance to a power)

The Inverse Distance to a Power gridding method is a weighted average interpolator.

You should supply the input arrays with the scattered data values including coordinates of every data point and output grid geometry. The function will compute interpolated value for the given position in output grid.

This algorithm is derived from the GDAL grid utility.

Default menu: Raster ‣ Analysis

Vedi anche

GDAL grid tutorial

23.2.1.6.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Vettore di punti

IN INGRESSO

[vettore: punto]

Input point vector layer

Weighting power

POWER

[numero]

Default: 2.0

Weighting power

Smothing

SMOOTHING

[numero]

Default: 0.0

Smoothing parameter

The first radius of search ellipse

RADIUS_1

[numero]

Default: 0.0

The first radius (X axis if rotation angle is 0) of the search ellipse

The second radius of search ellipse

RADIUS_2

[numero]

Default: 0.0

The second radius (Y axis if rotation angle is 0) of the search ellipse

Angle of search ellipse rotation in degrees (counter clockwise)

ANGLE

[numero]

Default: 0.0

Angle of ellipse rotation in degrees. Ellipse rotated counter clockwise.

Maximum number of data points to use

MAX_POINTS

[numero]

Predefinito: 0

Do not search for more points than this number.

Minimum number of data points to use

MIN_POINTS

[numero]

Predefinito: 0

Minimum number of data points to average. If less amount of points found the grid node considered empty and will be filled with NODATA marker.

Nodata

NODATA

[numero]

Default: 0.0

No data marker to fill empty points

Z value from field

Optional

Z_FIELD

[tablefield: numeric]

Field for the interpolation

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Output data type

DATA_TYPE

[numero]

Predefinito: 5

Defines the data type 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

Interpolated (IDW)

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[raster]

Default: [Save to temporary file]

Specify the output raster layer with interpolated values. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.6.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Interpolated (IDW)

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[raster]

Output raster with interpolated values

23.2.1.6.3. Python code

Algorithm ID: gdal:gridinversedistance

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.7. Grid (Linear)

The Linear method perform linear interpolation by computing a Delaunay triangulation of the point cloud, finding in which triangle of the triangulation the point is, and by doing linear interpolation from its barycentric coordinates within the triangle. If the point is not in any triangle, depending on the radius, the algorithm will use the value of the nearest point or the NODATA value.

This algorithm is derived from the GDAL grid utility.

23.2.1.7.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Vettore di punti

IN INGRESSO

[vettore: punto]

Input point vector layer

Search distance

RAGGIO

[numero]

Default: -1.0

In case the point to be interpolated does not fit into a triangle of the Delaunay triangulation, use that maximum distance to search a nearest neighbour, or use nodata otherwise. If set to -1, the search distance is infinite. If set to 0, no data value will be used.

Nodata

NODATA

[numero]

Default: 0.0

No data marker to fill empty points

Z value from field

Optional

Z_FIELD

[tablefield: numeric]

Field for the interpolation

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Output data type

DATA_TYPE

[numero]

Predefinito: 5

Defines the data type 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

Interpolated (Linear)

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[raster]

Default: [Save to temporary file]

Specify the output raster layer with interpolated values. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.7.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Interpolated (Linear)

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[raster]

Output raster with interpolated values

23.2.1.7.3. Python code

Algorithm ID: gdal:gridlinear

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.8. Grid (Moving average)

The Moving Average is a simple data averaging algorithm. It uses a moving window of elliptic form to search values and averages all data points within the window. Search ellipse can be rotated by specified angle, the center of ellipse located at the grid node. Also the minimum number of data points to average can be set, if there are not enough points in window, the grid node considered empty and will be filled with specified NODATA value.

This algorithm is derived from the GDAL grid utility.

Default menu: Raster ‣ Analysis

Vedi anche

GDAL grid tutorial

23.2.1.8.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Vettore di punti

IN INGRESSO

[vettore: punto]

Input point vector layer

The first radius of search ellipse

RADIUS_1

[numero]

Default: 0.0

The first radius (X axis if rotation angle is 0) of the search ellipse

The second radius of search ellipse

RADIUS_2

[numero]

Default: 0.0

The second radius (Y axis if rotation angle is 0) of the search ellipse

Angle of search ellipse rotation in degrees (counter clockwise)

ANGLE

[numero]

Default: 0.0

Angle of ellipse rotation in degrees. Ellipse rotated counter clockwise.

Minimum number of data points to use

MIN_POINTS

[numero]

Default: 0.0

Minimum number of data points to average. If less amount of points found the grid node considered empty and will be filled with NODATA marker.

Nodata

NODATA

[numero]

Default: 0.0

No data marker to fill empty points

Z value from field

Optional

Z_FIELD

[tablefield: numeric]

Field for the interpolation

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Output data type

DATA_TYPE

[numero]

Predefinito: 5

Defines the data type 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

Interpolated (moving average)

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[raster]

Default: [Save to temporary file]

Specify the output raster layer. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.8.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Interpolated (moving average)

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[raster]

Output raster with interpolated values

23.2.1.8.3. Python code

Algorithm ID: gdal:gridaverage

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.9. Grid (Nearest neighbor)

The Nearest Neighbor method doesn’t perform any interpolation or smoothing, it just takes the value of nearest point found in grid node search ellipse and returns it as a result. If there are no points found, the specified NODATA value will be returned.

This algorithm is derived from the GDAL grid utility.

Default menu: Raster ‣ Analysis

Vedi anche

GDAL grid tutorial

23.2.1.9.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Vettore di punti

IN INGRESSO

[vettore: punto]

Input point vector layer

The first radius of search ellipse

RADIUS_1

[numero]

Default: 0.0

The first radius (X axis if rotation angle is 0) of the search ellipse

The second radius of search ellipse

RADIUS_2

[numero]

Default: 0.0

The second radius (Y axis if rotation angle is 0) of the search ellipse

Angle of search ellipse rotation in degrees (counter clockwise)

ANGLE

[numero]

Default: 0.0

Angle of ellipse rotation in degrees. Ellipse rotated counter clockwise.

Nodata

NODATA

[numero]

Default: 0.0

No data marker to fill empty points

Z value from field

Optional

Z_FIELD

[tablefield: numeric]

Field for the interpolation

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Output data type

DATA_TYPE

[numero]

Predefinito: 5

Defines the data type 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

Interpolated (Nearest neighbour)

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[raster]

Default: [Save to temporary file]

Specify the output raster layer with interpolated values. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.9.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Interpolated (Nearest neighbour)

LIVELLO IN USCITA

[raster]

Output raster with interpolated values

23.2.1.9.3. Python code

Algorithm ID: gdal:gridnearestneighbor

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.10. Ombreggiatura

Outputs a raster with a nice shaded relief effect. It’s very useful for visualizing the terrain. You can optionally specify the azimuth and altitude of the light source, a vertical exaggeration factor and a scaling factor to account for differences between vertical and horizontal units.

This algorithm is derived from the GDAL DEM utility .

Default menu: Raster ‣ Analysis

23.2.1.10.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Livello in ingresso

IN INGRESSO

[raster]

Input Elevation raster layer

Band number

BAND

[raster band]

Default: 1

Band containing the elevation information

Z factor (vertical exaggeration)

Z_FACTOR

[numero]

Default: 1.0

The factor exaggerates the height of the output elevation raster

Scale (ratio of vert. units to horiz.)

SCALE

[numero]

Default: 1.0

The ratio of vertical units to horizontal units

Azimuth of the light

AZIMUTH

[numero]

Default: 315.0

Defines the azimuth of the light shining on the elevation raster in degrees. If it comes from the top of the raster the value is 0, if it comes from the east it is 90 a.s.o.

Altitude of the light

ALTITUDE

[numero]

Default: 45.0

Defines the altitude of the light, in degrees. 90 if the light comes from above the elevation raster, 0 if it is raking light.

Compute edges

COMPUTE_EDGES

[boolean]

Default: False

Generates edges from the elevation raster

Use Zevenbergen&Thorne formula (instead of the Horn’s one)

ZEVENBERGEN

[boolean]

Default: False

Activates Zevenbergen&Thorne formula for smooth landscapes

Combined shading

COMBINED

[boolean]

Default: False

Multidirectional shading

MULTIDIRECTIONAL

[boolean]

Default: False

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Hillshade

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[raster]

Default: [Save to temporary file]

Specify the output raster layer with interpolated values. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.10.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Hillshade

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[raster]

Output raster with interpolated values

23.2.1.10.3. Python code

Algorithm ID: gdal:hillshade

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.11. Near black

Converts nearly black/white borders to black.

This algorithm will scan an image and try to set all pixels that are nearly or exactly black, white or one or more custom colors around the collar to black or white. This is often used to «fix up» lossy compressed airphotos so that color pixels can be treated as transparent when mosaicking.

This algorithm is derived from the GDAL nearblack utility.

Default menu: Raster ‣ Analysis

23.2.1.11.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Livello in ingresso

IN INGRESSO

[raster]

Input Elevation raster layer

How far from black (white)

NEAR

[numero]

Default: 15

Select how far from black, white or custom colors the pixel values can be and still considered near black, white or custom color.

Search for nearly white pixels instead of nearly black

WHITE

[boolean]

Default: False

Search for nearly white (255) pixels instead of nearly black pixels

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Nearblack

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[raster]

Default: [Save to temporary file]

Specify the output raster layer. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.11.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Nearblack

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[raster]

Output raster

23.2.1.11.3. Python code

Algorithm ID: gdal:nearblack

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.12. Proximity (raster distance)

Generates a raster proximity map indicating the distance from the center of each pixel to the center of the nearest pixel identified as a target pixel. Target pixels are those in the source raster for which the raster pixel value is in the set of target pixel values.

This algorithm is derived from the GDAL proximity utility.

Default menu: Raster ‣ Analysis

23.2.1.12.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Livello in ingresso

IN INGRESSO

[raster]

Input Elevation raster layer

Band number

BAND

[raster band]

Default: 1

Band containing the elevation information

A list of pixel values in the source image to be considered target pixels

Optional

VALUES

[stringa]

Default: “”

A list of target pixel values in the source image to be considered target pixels. If not specified, all non-zero pixels will be considered target pixels.

Distance units

UNITÀ

[numero]

Default: 1

Indicate whether distances generated should be in pixel or georeferenced coordinates. One of:

  • 0 — Georeferenced coordinates

  • 1 — Pixel coordinates

The maximum distance to be generated

Optional

MAX_DISTANCE

[numero]

Default: 0.0

The maximum distance to be generated. The nodata value will be used for pixels beyond this distance. If a nodata value is not provided, the output band will be queried for its nodata value. If the output band does not have a nodata value, then the value 65535 will be used. Distance is interpreted according to the value of Distance units.

Value to be applied to all pixels that are within the maxdist of target pixels

Optional

REPLACE

[numero]

Default: 0.0

Specify a value to be applied to all pixels that are closer than the maximum distance from target pixels (including the target pixels) instead of a distance value.

Nodata value to use for the destination proximity raster

Optional

NODATA

[numero]

Default: 0.0

Specify the nodata value to use for the output raster

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Output data type

DATA_TYPE

[numero]

Predefinito: 5

Defines the data type 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

Proximity map

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[raster]

Default: [Save to temporary file]

Specify the output raster layer. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.12.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Proximity map

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[raster]

Output raster

23.2.1.12.3. Python code

Algorithm ID: gdal:proximity

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.13. Roughness

Outputs a single-band raster with values computed from the elevation. Roughness is the degree of irregularity of the surface. It’s calculated by the largest inter-cell difference of a central pixel and its surrounding cell. The determination of the roughness plays a role in the analysis of terrain elevation data, it’s useful for calculations of the river morphology, in climatology and physical geography in general.

This algorithm is derived from the GDAL DEM utility.

Default menu: Raster ‣ Analysis

23.2.1.13.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Livello in ingresso

IN INGRESSO

[raster]

Input elevation raster layer

Band number

BAND

[raster band]

Default: 1

The number of the band to use as elevation

Compute edges

COMPUTE_EDGES

[boolean]

Default: False

Generates edges from the elevation raster

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Roughness

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[raster]

Default: [Save to temporary file]

Specify the output raster layer. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.13.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Roughness

LIVELLO IN USCITA

[raster]

Single-band output roughness raster. The value -9999 is used as nodata value.

23.2.1.13.3. Python code

Algorithm ID: gdal:roughness

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.14. Sieve

Removes raster polygons smaller than a provided threshold size (in pixels) and replaces them with the pixel value of the largest neighbour polygon. It is useful if you have a large amount of small areas on your raster map.

This algorithm is derived from the GDAL sieve utility.

Default menu: Raster ‣ Analysis

23.2.1.14.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Livello in ingresso

IN INGRESSO

[raster]

Input elevation raster layer

Threshold

THRESHOLD

[numero]

Default: 10

Only raster polygons smaller than this size will be removed

Use 8-connectedness

EIGHT_CONNECTEDNESS

[boolean]

Default: False

Use eight connectedness instead of four connectedness

Do not use the default validity mask for the input band

NO_MASK

[boolean]

Default: False

Validity mask

Optional

MASK_LAYER

[raster]

Validity mask to use instead of the default

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Sieved

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[raster]

Default: [Save to temporary file]

Specify the output raster layer. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.14.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Sieved

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[raster]

Output raster layer.

23.2.1.14.3. Python code

Algorithm ID: gdal:sieve

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.15. Slope

Generates a slope map from any GDAL-supported elevation raster. Slope is the angle of inclination to the horizontal. You have the option of specifying the type of slope value you want: degrees or percent slope.

This algorithm is derived from the GDAL DEM utility.

Default menu: Raster ‣ Analysis

23.2.1.15.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Livello in ingresso

IN INGRESSO

[raster]

Input Elevation raster layer

Band number

BAND

[raster band]

Default: 1

Band containing the elevation information

Ratio of vertical units to horizontal

SCALE

[numero]

Default: 1.0

The ratio of vertical units to horizontal units

Slope expressed as percent (instead of degrees)

AS_PERCENT

[boolean]

Default: False

Express slope as percent instead of degrees

Compute edges

COMPUTE_EDGES

[boolean]

Default: False

Generates edges from the elevation raster

Use Zevenbergen&Thorne formula (instead of the Horn’s one)

ZEVENBERGEN

[boolean]

Default: False

Activates Zevenbergen&Thorne formula for smooth landscapes

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Additional command-line parameters

Optional

EXTRA

[stringa]

Default: None

Add extra GDAL command line options

Slope

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[raster]

Default: [Save to temporary file]

Specify the output raster layer. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.15.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Slope

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[raster]

Output raster

23.2.1.15.3. Python code

Algorithm ID: gdal:slope

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.16. Terrain Ruggedness Index (TRI)

Outputs a single-band raster with values computed from the elevation. TRI stands for Terrain Ruggedness Index, which is defined as the mean difference between a central pixel and its surrounding cells.

This algorithm is derived from the GDAL DEM utility.

Default menu: Raster ‣ Analysis

23.2.1.16.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Livello in ingresso

IN INGRESSO

[raster]

Input elevation raster layer

Band number

BAND

[raster band]

Default: 1

The number of the band to use as elevation

Compute edges

COMPUTE_EDGES

[boolean]

Default: False

Generates edges from the elevation raster

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Terrain Ruggedness Index

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[raster]

Default: [Save to temporary file]

Specify the output raster layer. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.16.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Terrain Ruggedness Index

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[raster]

Output ruggedness raster. The value -9999 is used as nodata value.

23.2.1.16.3. Python code

Algorithm ID: gdal:triterrainruggednessindex

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.2.1.17. Topographic Position Index (TPI)

Outputs a single-band raster with values computed from the elevation. TPI stands for Topographic Position Index, which is defined as the difference between a central pixel and the mean of its surrounding cells.

This algorithm is derived from the GDAL DEM utility.

Default menu: Raster ‣ Analysis

23.2.1.17.1. Parametri

Etichetta

Nome

Tipo

Descrizione

Livello in ingresso

IN INGRESSO

[raster]

Input elevation raster layer

Band number

BAND

[raster band]

Default: 1

The number of the band to use for elevation values

Compute edges

COMPUTE_EDGES

[boolean]

Default: False

Generates edges from the elevation raster

Opzioni addizionali di creazione

Optional

OPZIONI

[stringa]

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).

Terrain Ruggedness Index

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[raster]

Default: [Save to temporary file]

Specify the output raster layer. One of:

  • Salva come File Temporaneo

  • Salva come File…

La codifica del file può anche essere cambiata qui.

23.2.1.17.2. In uscita:

Etichetta

Nome

Tipo

Descrizione

Terrain Ruggedness Index

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[raster]

Output raster.

23.2.1.17.3. Python code

Algorithm ID: gdal:tpitopographicpositionindex

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 Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.