24.1.9. Análise Raster

24.1.9.1. Cell statistics

Computes per-cell statistics based on input raster layers and for each cell writes the resulting statistics to an output raster. At each cell location, the output value is defined as a function of all overlaid cell values of the input rasters.

By default, a NoData cell in ANY of the input layers will result in a NoData cell in the output raster. If the Ignore NoData values option is checked, then NoData inputs will be ignored in the statistic calculation. This may result in NoData output for locations where all cells are NoData.

The Reference layer parameter specifies an existing raster layer to use as a reference when creating the output raster. The output raster will have the same extent, CRS, and pixel dimensions as this layer.

Calculation details: Input raster layers that do not match the cell size of the reference raster layer will be resampled using nearest neighbor resampling. The output raster data type will be set to the most complex data type present in the input datasets except when using the functions Mean, Standard deviation and Variance (data type is always Float32 or Float64 depending on input float type) or Count and Variety (data type is always Int32).

  • Count: The count statistic will always result in the number of cells without NoData values at the current cell location.

  • Median: If the number of input layers is even, the median will be calculated as the arithmetic mean of the two middle values of the ordered cell input values.

  • Minority/Majority: If no unique minority or majority could be found, the result is NoData, except all input cell values are equal.

../../../../_images/cell_statistics_all_stats.png

Fig. 24.8 Example with all the statistic functions. NoData cells (grey) are taken into account.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Camadas de entrada

ENTRADA

[raster] [list]

Input raster layers

Statistic

STATISTIC

[enumeration]

Padrão: 0

Available statistics. Options:

  • 0 — Sum

  • 1 — Count

  • 2 — Mean

  • 3 — Median

  • 4 — Standard deviation

  • 5 — Variance

  • 6 — Minimum

  • 7 — Maximum

  • 8 — Minority (least common value)

  • 9 — Majority (most common value)

  • 10 — Range (max - min)

  • 11 — Variety (unique value count)

Ignore NoData values

IGNORE_NODATA

[boolean]

Default: True

Calculate statistics also for all cells stacks, ignoring NoData occurrence.

Camada de referência

REF_LAYER

[raster]

The reference layer to create the output layer from (extent, CRS, pixel dimensions)

Output no data value

Opcional

OUTPUT_NO_DATA_VALUE

[number]

Default: -9999.0

Value to use for nodata in the output layer

Camada de saída

SAÍDA

[same as input]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

CRS authority identifier

CRS_AUTHID

[crs]

The coordinate reference system of the output raster layer

Extent

EXTENT

[extent]

The spatial extent of the output raster layer

Height in pixels

HEIGHT_IN_PIXELS

[integer]

The height in pixels of the output raster layer

Output raster

SAÍDA

[raster]

Output raster layer containing the result

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Width in pixels

WIDTH_IN_PIXELS

[integer]

The width in pixels of the output raster layer

Python code

Algorithm ID: qgis:cellstatistics

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.2. Equal to frequency

Evaluates on a cell-by-cell basis the frequency (number of times) the values of an input stack of rasters are equal to the value of a value layer. The output raster extent and resolution are defined by the input raster layer and is always of Int32 type.

If multiband rasters are used in the data raster stack, the algorithm will always perform the analysis on the first band of the rasters - use GDAL to use other bands in the analysis. The output NoData value can be set manually.

../../../../_images/equaltofrequency.png

Fig. 24.9 For each cell in the output raster, the value represents the number of times that the corresponding cells in the list of rasters are the same as the value raster. NoData cells (grey) are taken into account.

Parâmetros

Basic parameters

Etiqueta

Nome

Tipo

Descrição

Input value raster

INPUT_VALUE_RASTER

[raster]

The input value layer serves as reference layer for the sample layers

Value raster band

INPUT_VALUE_RASTER_BAND

[raster band]

Default: The first band of the raster layer

Select the band you want to use as sample

Input raster layers

INPUT_RASTERS

[raster] [list]

Raster layers to evaluate. If multiband rasters are used in the data raster stack, the algorithm will always perform the analysis on the first band of the rasters

Ignore NoData values

IGNORE_NODATA

[boolean]

Padrão: Falso

If unchecked, any NoData cells in the value raster or the data layer stack will result in a NoData cell in the output raster

Camada de saída

SAÍDA

[same as input]

Default: [Save to temporary file]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

Advanced parameters

Etiqueta

Nome

Tipo

Descrição

Output no data value

Opcional

OUTPUT_NO_DATA_VALUE

[number]

Default: -9999.0

Value to use for nodata in the output layer

Saídas

Etiqueta

Nome

Tipo

Descrição

Camada de saída

SAÍDA

[raster]

Output raster layer containing the result

CRS authority identifier

CRS_AUTHID

[string]

The coordinate reference system of the output raster layer

Extent

EXTENT

[string]

The spatial extent of the output raster layer

Count of cells with equal value occurrences

FOUND_LOCATIONS_COUNT

[number]

Height in pixels

HEIGHT_IN_PIXELS

[number]

The number of rows in the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Mean frequency at valid cell locations

MEAN_FREQUENCY_PER_LOCATION

[number]

Count of value occurrences

OCCURRENCE_COUNT

[number]

Width in pixels

WIDTH_IN_PIXELS

[integer]

The number of columns in the output raster layer

Python code

Algorithm ID: native:equaltofrequency

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.3. Fuzzify raster (gaussian membership)

Transforms an input raster to a fuzzified raster by assigning a membership value to each pixel, using a Gaussian membership function. Membership values range from 0 to 1. In the fuzzified raster, a value of 0 implies no membership of the defined fuzzy set, whereas a value of 1 means full membership. The gaussian membership function is defined as gaussian_formula, where f1 is the spread and f2 the midpoint.

../../../../_images/gaussianimage.png

Fig. 24.10 Fuzzify raster example. Input raster source: Land Tirol - data.tirol.gv.at.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Input Raster

ENTRADA

[raster]

Camada raster de entrada

Band Number

BAND

[raster band]

Default: The first band of the raster layer

If the raster is multiband, choose the band that you want to fuzzify.

Function midpoint

FUZZYMIDPOINT

[number]

Default: 10

Midpoint of the gaussian function

Function spread

FUZZYSPREAD

[number]

Default: 0.01

Spread of the gaussian function

Fuzzified raster

SAÍDA

[same as input]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Fuzzified raster

SAÍDA

[same as input]

Output raster layer containing the result

CRS authority identifier

CRS_AUTHID

[crs]

The coordinate reference system of the output raster layer

Extent

EXTENT

[extent]

The spatial extent of the output raster layer

Width in pixels

WIDTH_IN_PIXELS

[integer]

The width in pixels of the output raster layer

Height in pixels

HEIGHT_IN_PIXELS

[integer]

The height in pixels of the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Python code

Algorithm ID: qgis:fuzzifyrastergaussianmembership

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.4. Fuzzify raster (large membership)

Transforms an input raster to a fuzzified raster by assigning a membership value to each pixel, using a Large membership function. Membership values range from 0 to 1. In the fuzzified raster, a value of 0 implies no membership of the defined fuzzy set, whereas a value of 1 means full membership. The large membership function is defined as fuzzy_large_formula, where f1 is the spread and f2 the midpoint.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Input Raster

ENTRADA

[raster]

Camada raster de entrada

Band Number

BAND

[raster band]

Default: The first band of the raster layer

If the raster is multiband, choose the band that you want to fuzzify.

Function midpoint

FUZZYMIDPOINT

[number]

Default: 50

Midpoint of the large function

Function spread

FUZZYSPREAD

[number]

Padrão: 5

Spread of the large function

Fuzzified raster

SAÍDA

[same as input]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Fuzzified raster

SAÍDA

[same as input]

Output raster layer containing the result

CRS authority identifier

CRS_AUTHID

[crs]

The coordinate reference system of the output raster layer

Extent

EXTENT

[extent]

The spatial extent of the output raster layer

Width in pixels

WIDTH_IN_PIXELS

[integer]

The width in pixels of the output raster layer

Height in pixels

HEIGHT_IN_PIXELS

[integer]

The height in pixels of the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Python code

Algorithm ID: qgis:fuzzifyrasterlargemembership

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.5. Fuzzify raster (linear membership)

Transforms an input raster to a fuzzified raster by assigning a membership value to each pixel, using a Linear membership function. Membership values range from 0 to 1. In the fuzzified raster, a value of 0 implies no membership of the defined fuzzy set, whereas a value of 1 means full membership. The linear function is defined as fuzzy_linear_formula, where a is the low bound and b the high bound. This equation assigns membership values using a linear transformation for pixel values between the low and high bounds. Pixels values smaller than the low bound are given 0 membership whereas pixel values greater than the high bound are given 1 membership.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Input Raster

ENTRADA

[raster]

Camada raster de entrada

Band Number

BAND

[raster band]

Default: The first band of the raster layer

If the raster is multiband, choose the band that you want to fuzzify.

Low fuzzy membership bound

FUZZYLOWBOUND

[number]

Padrão: 0

Low bound of the linear function

High fuzzy membership bound

FUZZYHIGHBOUND

[number]

Padrão: 1

High bound of the linear function

Fuzzified raster

SAÍDA

[same as input]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Fuzzified raster

SAÍDA

[same as input]

Output raster layer containing the result

CRS authority identifier

CRS_AUTHID

[crs]

The coordinate reference system of the output raster layer

Extent

EXTENT

[extent]

The spatial extent of the output raster layer

Width in pixels

WIDTH_IN_PIXELS

[integer]

The width in pixels of the output raster layer

Height in pixels

HEIGHT_IN_PIXELS

[integer]

The height in pixels of the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Python code

Algorithm ID: qgisfuzzifyrasterlinearmembership

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.6. Fuzzify raster (near membership)

Transforms an input raster to a fuzzified raster by assigning a membership value to each pixel, using a Near membership function. Membership values range from 0 to 1. In the fuzzified raster, a value of 0 implies no membership of the defined fuzzy set, whereas a value of 1 means full membership. The near membership function is defined as near_formula, where f1 is the spread and f2 the midpoint.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Input Raster

ENTRADA

[raster]

Camada raster de entrada

Band Number

BAND

[raster band]

Default: The first band of the raster layer

If the raster is multiband, choose the band that you want to fuzzify.

Function midpoint

FUZZYMIDPOINT

[number]

Default: 50

Midpoint of the near function

Function spread

FUZZYSPREAD

[number]

Default: 0.01

Spread of the near function

Fuzzified raster

SAÍDA

[same as input]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Fuzzified raster

SAÍDA

[same as input]

Output raster layer containing the result

CRS authority identifier

CRS_AUTHID

[crs]

The coordinate reference system of the output raster layer

Extent

EXTENT

[extent]

The spatial extent of the output raster layer

Width in pixels

WIDTH_IN_PIXELS

[integer]

The width in pixels of the output raster layer

Height in pixels

HEIGHT_IN_PIXELS

[integer]

The height in pixels of the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Python code

Algorithm ID: qgis:fuzzifyrasternearmembership

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.7. Fuzzify raster (power membership)

Transforms an input raster to a fuzzified raster by assigning a membership value to each pixel, using a Power membership function. Membership values range from 0 to 1. In the fuzzified raster, a value of 0 implies no membership of the defined fuzzy set, whereas a value of 1 means full membership. The power function is defined as power_formula, where a is the low bound, b is the high bound, and f1 the exponent. This equation assigns membership values using the power transformation for pixel values between the low and high bounds. Pixels values smaller than the low bound are given 0 membership whereas pixel values greater than the high bound are given 1 membership.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Input Raster

ENTRADA

[raster]

Camada raster de entrada

Band Number

BAND

[raster band]

Default: The first band of the raster layer

If the raster is multiband, choose the band that you want to fuzzify.

Low fuzzy membership bound

FUZZYLOWBOUND

[number]

Padrão: 0

Low bound of the power function

High fuzzy membership bound

FUZZYHIGHBOUND

[number]

Padrão: 1

High bound of the power function

High fuzzy membership bound

FUZZYEXPONENT

[number]

Default: 2

Exponent of the power function

Fuzzified raster

SAÍDA

[same as input]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Fuzzified raster

SAÍDA

[same as input]

Output raster layer containing the result

CRS authority identifier

CRS_AUTHID

[crs]

The coordinate reference system of the output raster layer

Extent

EXTENT

[extent]

The spatial extent of the output raster layer

Width in pixels

WIDTH_IN_PIXELS

[integer]

The width in pixels of the output raster layer

Height in pixels

HEIGHT_IN_PIXELS

[integer]

The height in pixels of the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Python code

Algorithm ID: qgisfuzzifyrasterpowermembership

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.8. Fuzzify raster (small membership)

Transforms an input raster to a fuzzified raster by assigning a membership value to each pixel, using a Small membership function. Membership values range from 0 to 1. In the fuzzified raster, a value of 0 implies no membership of the defined fuzzy set, whereas a value of 1 means full membership. The small membership function is defined as small_formula, where f1 is the spread and f2 the midpoint.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Input Raster

ENTRADA

[raster]

Camada raster de entrada

Band Number

BAND

[raster band]

Default: The first band of the raster layer

If the raster is multiband, choose the band that you want to fuzzify.

Function midpoint

FUZZYMIDPOINT

[number]

Default: 50

Midpoint of the small function

Function spread

FUZZYSPREAD

[number]

Padrão: 5

Spread of the small function

Fuzzified raster

SAÍDA

[same as input]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Fuzzified raster

SAÍDA

[same as input]

Output raster layer containing the result

CRS authority identifier

CRS_AUTHID

[crs]

The coordinate reference system of the output raster layer

Extent

EXTENT

[extent]

The spatial extent of the output raster layer

Width in pixels

WIDTH_IN_PIXELS

[integer]

The width in pixels of the output raster layer

Height in pixels

HEIGHT_IN_PIXELS

[integer]

The height in pixels of the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Python code

Algorithm ID: qgisfuzzifyrastersmallmembership

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.9. Greater than frequency

Evaluates on a cell-by-cell basis the frequency (number of times) the values of an input stack of rasters are equal to the value of a value raster. The output raster extent and resolution is defined by the input raster layer and is always of Int32 type.

If multiband rasters are used in the data raster stack, the algorithm will always perform the analysis on the first band of the rasters - use GDAL to use other bands in the analysis. The output NoData value can be set manually.

../../../../_images/greaterthanfrequency.png

Fig. 24.11 For each cell in the output raster, the value represents the number of times that the corresponding cells in the list of rasters are greater than the value raster. NoData cells (grey) are taken into account.

Parâmetros

Basic parameters

Etiqueta

Nome

Tipo

Descrição

Input value raster

INPUT_VALUE_RASTER

[raster]

The input value layer serves as reference layer for the sample layers

Value raster band

INPUT_VALUE_RASTER_BAND

[raster band]

Default: The first band of the raster layer

Select the band you want to use as sample

Input raster layers

INPUT_RASTERS

[raster] [list]

Raster layers to evaluate. If multiband rasters are used in the data raster stack, the algorithm will always perform the analysis on the first band of the rasters

Ignore NoData values

IGNORE_NODATA

[boolean]

Padrão: Falso

If unchecked, any NoData cells in the value raster or the data layer stack will result in a NoData cell in the output raster

Camada de saída

SAÍDA

[same as input]

Default: [Save to temporary file]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

Advanced parameters

Etiqueta

Nome

Tipo

Descrição

Output no data value

Opcional

OUTPUT_NO_DATA_VALUE

[number]

Default: -9999.0

Value to use for nodata in the output layer

Saídas

Etiqueta

Nome

Tipo

Descrição

Camada de saída

SAÍDA

[raster]

Output raster layer containing the result

CRS authority identifier

CRS_AUTHID

[string]

The coordinate reference system of the output raster layer

Extent

EXTENT

[string]

The spatial extent of the output raster layer

Count of cells with equal value occurrences

FOUND_LOCATIONS_COUNT

[number]

Height in pixels

HEIGHT_IN_PIXELS

[number]

The number of rows in the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Mean frequency at valid cell locations

MEAN_FREQUENCY_PER_LOCATION

[number]

Count of value occurrences

OCCURRENCE_COUNT

[number]

Width in pixels

WIDTH_IN_PIXELS

[integer]

The number of columns in the output raster layer

Python code

Algorithm ID: native:greaterthanfrequency

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.10. Highest position in raster stack

Evaluates on a cell-by-cell basis the position of the raster with the highest value in a stack of rasters. Position counts start with 1 and range to the total number of input rasters. The order of the input rasters is relevant for the algorithm. If multiple rasters feature the highest value, the first raster will be used for the position value.

If multiband rasters are used in the data raster stack, the algorithm will always perform the analysis on the first band of the rasters - use GDAL to use other bands in the analysis. Any NoData cells in the raster layer stack will result in a NoData cell in the output raster unless the “ignore NoData” parameter is checked. The output NoData value can be set manually. The output rasters extent and resolution is defined by a reference raster layer and is always of Int32 type.

../../../../_images/highestposition.png

Parâmetros

Basic parameters

Etiqueta

Nome

Tipo

Descrição

Input raster layers

INPUT_RASTERS

[raster] [list]

List of raster layers to compare with

Camada de referência

REFERENCE_LAYER

[raster]

The reference layer for the output layer creation (extent, CRS, pixel dimensions)

Ignore NoData values

IGNORE_NODATA

[boolean]

Padrão: Falso

If unchecked, any NoData cells in the data layer stack will result in a NoData cell in the output raster

Camada de saída

SAÍDA

[raster]

Default: [Save to temporary file]

Specification of the output raster containing the result. One of:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

Advanced parameters

Etiqueta

Nome

Tipo

Descrição

Output no data value

OUTPUT_NODATA_VALUE

[number]

Default: -9999.0

Value to use for nodata in the output layer

Saídas

Etiqueta

Nome

Tipo

Descrição

Camada de saída

SAÍDA

[raster]

Output raster layer containing the result

CRS authority identifier

CRS_AUTHID

[string]

The coordinate reference system of the output raster layer

Extent

EXTENT

[string]

The spatial extent of the output raster layer

Width in pixels

WIDTH_IN_PIXELS

[integer]

The number of columns in the output raster layer

Height in pixels

HEIGHT_IN_PIXELS

[integer]

The number of rows in the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Python code

Algorithm ID: native:highestpositioninrasterstack

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.11. Less than frequency

Evaluates on a cell-by-cell basis the frequency (number of times) the values of an input stack of rasters are less than the value of a value raster. The output raster extent and resolution is defined by the input raster layer and is always of Int32 type.

If multiband rasters are used in the data raster stack, the algorithm will always perform the analysis on the first band of the rasters - use GDAL to use other bands in the analysis. The output NoData value can be set manually.

../../../../_images/lessthanfrequency.png

Fig. 24.12 For each cell in the output raster, the value represents the number of times that the corresponding cells in the list of rasters are less than the value raster. NoData cells (grey) are taken into account.

Parâmetros

Basic parameters

Etiqueta

Nome

Tipo

Descrição

Input value raster

INPUT_VALUE_RASTER

[raster]

The input value layer serves as reference layer for the sample layers

Value raster band

INPUT_VALUE_RASTER_BAND

[raster band]

Default: The first band of the raster layer

Select the band you want to use as sample

Input raster layers

INPUT_RASTERS

[raster] [list]

Raster layers to evaluate. If multiband rasters are used in the data raster stack, the algorithm will always perform the analysis on the first band of the rasters

Ignore NoData values

IGNORE_NODATA

[boolean]

Padrão: Falso

If unchecked, any NoData cells in the value raster or the data layer stack will result in a NoData cell in the output raster

Camada de saída

SAÍDA

[same as input]

Default: [Save to temporary file]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

Advanced parameters

Etiqueta

Nome

Tipo

Descrição

Output no data value

Opcional

OUTPUT_NO_DATA_VALUE

[number]

Default: -9999.0

Value to use for nodata in the output layer

Saídas

Etiqueta

Nome

Tipo

Descrição

Camada de saída

SAÍDA

[raster]

Output raster layer containing the result

CRS authority identifier

CRS_AUTHID

[string]

The coordinate reference system of the output raster layer

Extent

EXTENT

[string]

The spatial extent of the output raster layer

Count of cells with equal value occurrences

FOUND_LOCATIONS_COUNT

[number]

Height in pixels

HEIGHT_IN_PIXELS

[number]

The number of rows in the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Mean frequency at valid cell locations

MEAN_FREQUENCY_PER_LOCATION

[number]

Count of value occurrences

OCCURRENCE_COUNT

[number]

Width in pixels

WIDTH_IN_PIXELS

[integer]

The number of columns in the output raster layer

Python code

Algorithm ID: native:lessthanfrequency

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.12. Lowest position in raster stack

Evaluates on a cell-by-cell basis the position of the raster with the lowest value in a stack of rasters. Position counts start with 1 and range to the total number of input rasters. The order of the input rasters is relevant for the algorithm. If multiple rasters feature the lowest value, the first raster will be used for the position value.

If multiband rasters are used in the data raster stack, the algorithm will always perform the analysis on the first band of the rasters - use GDAL to use other bands in the analysis. Any NoData cells in the raster layer stack will result in a NoData cell in the output raster unless the “ignore NoData” parameter is checked. The output NoData value can be set manually. The output rasters extent and resolution is defined by a reference raster layer and is always of Int32 type.

../../../../_images/lowestposition.png

Parâmetros

Basic parameters

Etiqueta

Nome

Tipo

Descrição

Input raster layers

INPUT_RASTERS

[raster] [list]

List of raster layers to compare with

Camada de referência

REFERENCE_LAYER

[raster]

The reference layer for the output layer creation (extent, CRS, pixel dimensions)

Ignore NoData values

IGNORE_NODATA

[boolean]

Padrão: Falso

If unchecked, any NoData cells in the data layer stack will result in a NoData cell in the output raster

Camada de saída

SAÍDA

[raster]

Default: [Save to temporary file]

Specification of the output raster containing the result. One of:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

Advanced parameters

Etiqueta

Nome

Tipo

Descrição

Output no data value

OUTPUT_NODATA_VALUE

[number]

Default: -9999.0

Value to use for nodata in the output layer

Saídas

Etiqueta

Nome

Tipo

Descrição

Camada de saída

SAÍDA

[raster]

Output raster layer containing the result

CRS authority identifier

CRS_AUTHID

[string]

The coordinate reference system of the output raster layer

Extent

EXTENT

[string]

The spatial extent of the output raster layer

Width in pixels

WIDTH_IN_PIXELS

[integer]

The number of columns in the output raster layer

Height in pixels

HEIGHT_IN_PIXELS

[integer]

The number of rows in the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

Python code

Algorithm ID: native:lowestpositioninrasterstack

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.13. Raster boolean AND

Calculates the boolean AND for a set of input rasters. If all of the input rasters have a non-zero value for a pixel, that pixel will be set to 1 in the output raster. If any of the input rasters have 0 values for the pixel it will be set to 0 in the output raster.

The reference layer parameter specifies an existing raster layer to use as a reference when creating the output raster. The output raster will have the same extent, CRS, and pixel dimensions as this layer.

By default, a nodata pixel in ANY of the input layers will result in a nodata pixel in the output raster. If the Treat nodata values as false option is checked, then nodata inputs will be treated the same as a 0 input value.

Ver também

Raster boolean OR

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Camadas de entrada

ENTRADA

[raster] [list]

List of input raster layers

Camada de referência

REF_LAYER

[raster]

The reference layer to create the output layer from (extent, CRS, pixel dimensions)

Treat nodata values as false

NODATA_AS_FALSE

[boolean]

Padrão: Falso

Treat nodata values in the input files as 0 when performing the operation

Output no data value

NO_DATA

[number]

Default: -9999.0

Value to use for nodata in the output layer

Tipo de dados de saída

DATA_TYPE

[enumeration]

Padrão: 5

Output raster data type. Options:

  • 0 — Byte

  • 1 — Int16

  • 2 — UInt16

  • 3 — UInt32

  • 4 — Int32

  • 5 — Float32

  • 6 — Float64

  • 7 — CInt16

  • 8 — CInt32

  • 9 — CFloat32

  • 10 — CFloat64

Camada de saída

SAÍDA

[raster]

Camada raster de saída

Saídas

Etiqueta

Nome

Tipo

Descrição

Extent

EXTENT

[extent]

The extent of the output raster layer

CRS authority identifier

CRS_AUTHID

[crs]

The coordinate reference system of the output raster layer

Width in pixels

WIDTH_IN_PIXELS

[integer]

The width in pixels of the output raster layer

Height in pixels

HEIGHT_IN_PIXELS

[integer]

The height in pixels of the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

NODATA pixel count

NODATA_PIXEL_COUNT

[integer]

The count of nodata pixels in the output raster layer

True pixel count

TRUE_PIXEL_COUNT

[integer]

The count of True pixels (value = 1) in the output raster layer

False pixel count

FALSE_PIXEL_COUNT

[integer]

The count of False pixels (value = 0) in the output raster layer

Camada de saída

SAÍDA

[raster]

Output raster layer containing the result

Python code

Algorithm ID: qgis:rasterbooleanand

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.14. Raster boolean OR

Calculates the boolean OR for a set of input rasters. If all of the input rasters have a zero value for a pixel, that pixel will be set to 0 in the output raster. If any of the input rasters have 1 values for the pixel it will be set to 1 in the output raster.

The reference layer parameter specifies an existing raster layer to use as a reference when creating the output raster. The output raster will have the same extent, CRS, and pixel dimensions as this layer.

By default, a nodata pixel in ANY of the input layers will result in a nodata pixel in the output raster. If the Treat nodata values as false option is checked, then nodata inputs will be treated the same as a 0 input value.

Ver também

Raster boolean AND

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Camadas de entrada

ENTRADA

[raster] [list]

List of input raster layers

Camada de referência

REF_LAYER

[raster]

The reference layer to create the output layer from (extent, CRS, pixel dimensions)

Treat nodata values as false

NODATA_AS_FALSE

[boolean]

Padrão: Falso

Treat nodata values in the input files as 0 when performing the operation

Output no data value

NO_DATA

[number]

Default: -9999.0

Value to use for nodata in the output layer

Tipo de dados de saída

DATA_TYPE

[enumeration]

Padrão: 5

Output raster data type. Options:

  • 0 — Byte

  • 1 — Int16

  • 2 — UInt16

  • 3 — UInt32

  • 4 — Int32

  • 5 — Float32

  • 6 — Float64

  • 7 — CInt16

  • 8 — CInt32

  • 9 — CFloat32

  • 10 — CFloat64

Camada de saída

SAÍDA

[raster]

Camada raster de saída

Saídas

Etiqueta

Nome

Tipo

Descrição

Extent

EXTENT

[extent]

The extent of the output raster layer

CRS authority identifier

CRS_AUTHID

[crs]

The coordinate reference system of the output raster layer

Width in pixels

WIDTH_IN_PIXELS

[integer]

The width in pixels of the output raster layer

Height in pixels

HEIGHT_IN_PIXELS

[integer]

The height in pixels of the output raster layer

Total pixel count

TOTAL_PIXEL_COUNT

[integer]

The count of pixels in the output raster layer

NODATA pixel count

NODATA_PIXEL_COUNT

[integer]

The count of nodata pixels in the output raster layer

True pixel count

TRUE_PIXEL_COUNT

[integer]

The count of True pixels (value = 1) in the output raster layer

False pixel count

FALSE_PIXEL_COUNT

[integer]

The count of False pixels (value = 0) in the output raster layer

Camada de saída

SAÍDA

[raster]

Output raster layer containing the result

Python code

Algorithm ID: qgis:rasterbooleanor

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.15. Calculadora Raster

Performs algebraic operations using raster layers.

The resulting layer will have its values computed according to an expression. The expression can contain numerical values, operators and references to any of the layers in the current project.

Nota

When using the calculator in A interface de processamento em lote or from the Terminal Python QGIS the files to use have to be specified. The corresponding layers are referred using the base name of the file (without the full path). For instance, if using a layer at path/to/my/rasterfile.tif, the first band of that layer will be referred as rasterfile.tif@1.

Ver também

Calculadora raster

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Layers

Apenas GUI

Shows the list of all raster layers loaded in the legend. These can be used to fill the expression box (double click to add). Raster layers are referred by their name and the number of the band: layer_name@band_number. For instance, the first band from a layer named DEM will be referred as DEM@1.

Operators

Apenas GUI

Contains some calculator like buttons that can be used to fill the expression box.

Expressão

EXPRESSÃO

[string]

Expression that will be used to calculate the output raster layer. You can use the operator buttons provided to type directly the expression in this box.

Predefined expressions

Apenas GUI

You can use the predefined NDVI expression or you can define new expressions for calculations. The Add… button loads a defined expression (and lets you set the parameters). The Save… button lets you define a new expression.

Reference layer(s) (used for automated extent, cellsize, and CRS)

Opcional

CAMADAS

[raster] [list]

Layer(s) that will be used to fetch extent, cell size and CRS. By choosing the layer in this box you avoid filling in all the other parameters by hand. Raster layers are referred by their name and the number of the band: layer_name@band_number. For instance, the first band from a layer named DEM will be referred as DEM@1.

Cell size (use 0 or empty to set it automatically)

Opcional

CELLSIZE

[number]

Cell size of the output raster layer. If the cell size is not specified, the minimum cell size of the selected reference layer(s) will be used. The cell size will be the same for the X and Y axes.

Output extent (xmin, xmax, ymin, ymax)

Opcional

EXTENT

[extent]

Extent of the output raster layer. If the extent is not specified, the minimum extent that covers all the selected reference layers will be used.

SRC de Saída

Opcional

SRC

[crs]

CRS of the output raster layer. If the output CRS is not specified, the CRS of the first reference layer will be used.

Saída

SAÍDA

[raster]

Default: [Save to temporary file]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Saída

SAÍDA

[raster]

Output raster file with the calculated values.

Python code

Algorithm ID: qgis:rastercalculator

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.16. Raster layer statistics

Calculates basic statistics from the values in a given band of the raster layer. The output is loaded in the Processing ► Results viewer menu.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Camada de entrada

ENTRADA

[raster]

Camada raster de entrada

Band number

BAND

[raster band]

Default: The first band of the input layer

If the raster is multiband, choose the band you want to get statistics for.

Saída

OUTPUT_HTML_FILE

[html]

Default: [Save to temporary file]

Specification of the output file:

  • Ignorar Saída

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Valor máximo

MAX

[number]

Mean value

MEAN

[number]

Valor mínimo

MIN

[number]

Saída

OUTPUT_HTML_FILE

[html]

The output file contains the following information:

  • Analyzed file: path of the raster layer

  • Minimum value: minimum value of the raster

  • Maximum value: maximum value of the raster

  • Range: difference between the maximum and minimum values

  • Sum: total sum of the values

  • Mean value: mean of the values

  • Standard deviation: standard deviation of the values

  • Sum of the squares: sum of the squared differences of each observation from the overall mean

Range

RANGE

[number]

Standard deviation

STD_DEV

[number]

Soma

SOMA

[number]

Sum of the squares

SUM_OF_SQUARES

[number]

Python code

Algorithm ID: qgis:rasterlayerstatistics

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.17. Raster layer unique values report

Returns the count and area of each unique value in a given raster layer.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Camada de entrada

ENTRADA

[raster]

Camada raster de entrada

Band number

BAND

[raster band]

Default: The first band of the input layer

If the raster is multiband, choose the band you want to get statistics for.

Unique values report

OUTPUT_HTML_FILE

[file]

Default: [Save to temporary file]

Specification of the output file:

  • Ignorar Saída

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Unique values table

OUTPUT_TABLE

[table]

Default: [Skip output]

Specification of the table for unique values:

  • Ignorar Saída

  • Criar Camada Temporária

  • Salvar para Arquivo…

  • Save to GeoPackage…

  • Salvar para Tabela PostGIS…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

CRS authority identifier

CRS_AUTHID

[crs]

Extent

EXTENT

[extent]

Height in pixels

HEIGHT_IN_PIXELS

[number]

NODATA pixel count

NODATA_PIXEL_COUNT

[number]

Total pixel count

TOTAL_PIXEL_COUNT

[number]

Unique values report

OUTPUT_HTML_FILE

[html]

The output HTML file contains the following information:

  • Analyzed file: the path of the raster layer

  • Extent: xmin, ymin, xmax, ymax coordinates of the extent

  • Projection: projection of the layer

  • Width in pixels: number of columns and pixel width size

  • Height in pixels: number of rows and pixel width size

  • Total pixel count: count of all the pixels

  • NODATA pixel count: count of pixels with NODATA value

Unique values table

OUTPUT_TABLE

[table]

A table with three columns:

  • value: pixel value

  • count: count of pixels with this value

  • m2: total area in square meters of pixels with this value.

Width in pixels

WIDTH_IN_PIXELS

[number]

Python code

Algorithm ID: qgis:rasterlayeruniquevaluesreport

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.18. Raster layer zonal statistics

Calculates statistics for a raster layer’s values, categorized by zones defined in another raster layer.

Ver também

Zonal statistics

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Camada de entrada

ENTRADA

[raster]

Camada raster de entrada

Band number

BAND

[raster band]

Default: The first band of the raster layer

If the raster is multiband choose the band for which you want to calculate the statistics.

Zones layer

ZONES

[raster]

Raster layer defining zones. Zones are given by contiguous pixels having the same pixel value.

Zones band number

ZONES_BAND

[raster band]

Default: The first band of the raster layer

If the raster is multiband, choose the band that defines the zones

Camada de referência

Opcional

REF_LAYER

[enumeration]

Padrão: 0

Raster layer used to calculate the centroids that will be used as reference when determining the zones in the output layer. One of:

  • 0 — Input layer

  • 1 — Zones layer

Estatísticas

OUTPUT_TABLE

[table]

Table with the calculated statistics

Saídas

Etiqueta

Nome

Tipo

Descrição

CRS authority identifier

CRS_AUTHID

[crs]

Extent

EXTENT

[extent]

Height in pixels

HEIGHT_IN_PIXELS

[number]

NODATA pixel count

NODATA_PIXEL_COUNT

[number]

Estatísticas

OUTPUT_TABLE

[table]

The output layer contains the following information for each zone:

  • Area: the area in square raster units in the zone;

  • Sum: the total sum of the pixel values in the zone;

  • Count: the number of pixels in the zone;

  • Min: the minimum pixel value in the zone;

  • Max: the maximum pixel value in the zone;

  • Mean: the mean of the pixel values in the zone;

Total pixel count

TOTAL_PIXEL_COUNT

[number]

Width in pixels

WIDTH_IN_PIXELS

[number]

Python code

Algorithm ID: qgis:rasterlayerzonalstats

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.19. Raster surface volume

Calculates the volume under a raster surface relative to a given base level. This is mainly useful for Digital Elevation Models (DEM).

Parâmetros

Etiqueta

Nome

Tipo

Descrição

INPUT layer

ENTRADA

[raster]

Input raster, representing a surface

Band number

BAND

[raster band]

Default: The first band of the raster layer

If the raster is multiband, choose the band that shall define the surface.

Base level

LEVEL

[number]

Padrão: 0.0

Define a base or reference value. This base is used in the volume calculation according to the Method parameter (see below).

Método

MÉTODO

[enumeration]

Padrão: 0

Define the method for the volume calculation given by the difference between the raster pixel value and the Base level. Options:

  • 0 — Count Only Above Base Level: only pixels above the base level will add to the volume.

  • 1 — Count Only Below Base Level: only pixels below the base level will add to the volume.

  • 2 — Subtract Volumes Below Base level: pixels above the base level will add to the volume, pixels below the base level will subtract from the volume.

  • 3 — Add Volumes Below Base level: Add the volume regardless whether the pixel is above or below the base level. This is equivalent to sum the absolute values of the difference between the pixel value and the base level.

Surface volume report

OUTPUT_HTML_FILE

[html]

Default: [Save to temporary file]

Specification of the output HTML report. One of:

  • Ignorar saída

  • Save to Temporary File

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Surface volume table

OUTPUT_TABLE

[table]

Default: [Skip output]

Specification of the output table. One of:

  • Ignorar saída

  • Create Temporary Layer (TEMPORARY_OUTPUT)

  • Salvar para Arquivo…

  • Salvar para Geopackage…

  • Salvar para Tabela PostGIS…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Volume

VOLUME

[number]

The calculated volume

Area

AREA

[number]

The area in square map units

Pixel_count

PIXEL_COUNT

[number]

The total number of pixels that have been analyzed

Surface volume report

OUTPUT_HTML_FILE

[html]

The output report (containing volume, area and pixel count) in HTML format

Surface volume table

OUTPUT_TABLE

[table]

The output table (containing volume, area and pixel count)

Python code

Algorithm ID: qgis:rastersurfacevolume

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.20. Reclassify by layer

Reclassifies a raster band by assigning new class values based on the ranges specified in a vector table.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Camada raster

INPUT_RASTER

[raster]

Raster layer to reclassify

Band number

RASTER_BAND

[raster band]

Default: The first band of the raster layer

If the raster is multiband, choose the band you want to reclassify.

Layer containing class breaks

INPUT_TABLE

[vector: any]

Vector layer containing the values to use for classification.

Minimum class value field

MIN_FIELD

[tablefield: numeric]

Field with the minimum value of the range for the class.

Maximum class value field

MAX_FIELD

[tablefield: numeric]

Field with the maximum value of the range for the class.

Output value field

VALUE_FIELD

[tablefield: numeric]

Field with the value that will be assigned to the pixels that fall in the class (between the corresponding min and max values).

Output no data value

NO_DATA

[number]

Default: -9999.0

Value to apply to no data values.

Range boundaries

RANGE_BOUNDARIES

[enumeration]

Padrão: 0

Defines comparison rules for the classification. Options:

  • 0 — min < value <= max

  • 1 — min <= value < max

  • 2 — min <= value <= max

  • 3 — min < value < max

Use no data when no range matches value

NODATA_FOR_MISSING

[boolean]

Padrão: Falso

Values that do not belong to a class will result in the no data value. If False, the original value is kept.

Tipo de dados de saída

DATA_TYPE

[enumeration]

Padrão: 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

Reclassified raster

SAÍDA

[raster]

Especificação do raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Reclassified raster

SAÍDA

[raster]

Output raster layer with reclassified band values

Python code

Algorithm ID: qgis:reclassifybylayer

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.21. Reclassify by table

Reclassifies a raster band by assigning new class values based on the ranges specified in a fixed table.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Camada raster

INPUT_RASTER

[raster]

Raster layer to reclassify

Band number

RASTER_BAND

[raster band]

Padrão: 1

Raster band for which you want to recalculate values.

Reclassification table

TABELA

[table]

A 3-columns table to fill with the values to set the boundaries of each class (Minimum and Maximum) and the new Value to assign to the band values that fall in the class.

Output no data value

NO_DATA

[number]

Default: -9999.0

Value to apply to no data values.

Range boundaries

RANGE_BOUNDARIES

[enumeration]

Padrão: 0

Defines comparison rules for the classification. Options:

  • 0 — min < value <= max

  • 1 — min <= value < max

  • 2 — min <= value <= max

  • 3 — min < value < max

Use no data when no range matches value

NODATA_FOR_MISSING

[boolean]

Padrão: Falso

Applies the no data value to band values that do not fall in any class. If False, the original value is kept.

Tipo de dados de saída

DATA_TYPE

[enumeration]

Padrão: 5

Define o formato do arquivo de raster saída.

Opções:

  • 0 — Byte

  • 1 — Int16

  • 2 — UInt16

  • 3 — UInt32

  • 4 — Int32

  • 5 — Float32

  • 6 — Float64

  • 7 — CInt16

  • 8 — CInt32

  • 9 — CFloat32

  • 10 — CFloat64

Reclassified raster

SAÍDA

[raster]

Default: ‘[Save to temporary file]’

Especificação da camada raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Reclassified raster

SAÍDA

[raster]

Default: ‘[Save to temporary file]’

The output raster layer.

Python code

Algorithm ID: qgis:reclassifybytable

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.22. Rescale raster

Rescales raster layer to a new value range, while preserving the shape (distribution) of the raster’s histogram (pixel values). Input values are mapped using a linear interpolation from the source raster’s minimum and maximum pixel values to the destination minimum and miximum pixel range.

By default the algorithm preserves the original NODATA value, but there is an option to override it.

../../../../_images/rescale_raster.png

Fig. 24.13 Rescaling values of a raster layer from [0 - 50] to [100 - 1000]

Parâmetros

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Tipo

Descrição

Input Raster

ENTRADA

[raster]

Raster layer to use for rescaling

Band number

Band

[raster band]

Default: The first band of the input layer

If the raster is multiband, choose a band.

New minimum value

MINIMUM

[number]

Default value: 0.0

Minimum pixel value to use in the rescaled layer

New maximum value

MAXIMUM

[number]

Default value: 255.0

Maximum pixel value to use in the rescaled layer

New NODATA value

Opcional

NODATA

[number]

Default value: Not set

Value to assign to the NODATA pixels. If unset, original NODATA values are preserved.

Rescaled

SAÍDA

[raster]

Default: [Save to temporary file]

Especificação da camada raster de saída. Um de:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

Saídas

Etiqueta

Nome

Tipo

Descrição

Rescaled

SAÍDA

[raster]

Output raster layer with rescaled band values

Python code

Algorithm ID: native:rescaleraster

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.23. Round raster

Rounds the cell values of a raster dataset according to the specified number of decimals.

Alternatively, a negative number of decimal places may be used to round values to powers of a base n. For example, with a Base value n of 10 and Decimal places of -1, the algorithm rounds cell values to multiples of 10, -2 rounds to multiples of 100, and so on. Arbitrary base values may be chosen, the algorithm applies the same multiplicative principle. Rounding cell values to multiples of a base n may be used to generalize raster layers.

The algorithm preserves the data type of the input raster. Therefore byte/integer rasters can only be rounded to multiples of a base n, otherwise a warning is raised and the raster gets copied as byte/integer raster.

../../../../_images/round_raster.png

Fig. 24.14 Rounding values of a raster

Parâmetros

Basic parameters

Etiqueta

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Tipo

Descrição

Input raster

ENTRADA

[raster]

The raster to process.

Band number

BAND

[number]

Padrão: 1

The band of the raster

Rounding direction

ROUNDING_DIRECTION

[list]

Padrão: 1

How to choose the target rounded value. Options are:

0 - Round up 1 - Round to nearest 2 - Round down

Number of decimals places

DECIMAL_PLACES

[number]

Default: 2

Number of decimals places to round to. Use negative values to round cell values to a multiple of a base n

Output raster

SAÍDA

[raster]

Default: [Save to temporary file]

Specification of the output file. One of:

  • Salvar como Arquivo Temporário

  • Salvar para Arquivo…

Advanced parameters

Etiqueta

Nome

Tipo

Descrição

Base n for rounding to multiples of n

BASE_N

[number]

Default: 10

When the DECIMAL_PLACES parameter is negative, raster values are rounded to multiples of the base n value

Saídas

Etiqueta

Nome

Tipo

Descrição

Output raster

SAÍDA

[raster]

The output raster layer with values rounded for the selected band.

Python code

Algorithm ID: native:roundrastervalues

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.24. Sample raster values

Extracts raster values at the point locations. If the raster layer is multiband, each band is sampled.

The attribute table of the resulting layer will have as many new columns as the raster layer band count.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Input Point Layer

ENTRADA

[vector: point]

Point vector layer to use for sampling

Raster Layer to sample

RASTERCOPY

[raster]

Raster layer to sample at the given point locations.

Output column prefix

COLUMN_PREFIX

[string]

Default: ‘rvalue’

Prefix for the names of the added columns.

Sampled Points

Opcional

SAÍDA

[vector: point]

Default: [Create temporary layer]

Specify the output layer containing the sampled values. One of:

  • Create Temporary Layer (TEMPORARY_OUTPUT)

  • Salvar para Arquivo…

  • Salvar para Geopackage…

  • Save to Database Table…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Sampled Points

Opcional

SAÍDA

[vector: point]

The output layer containing the sampled values.

Python code

Algorithm ID: qgis:rastersampling

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.25. Zonal histogram

Appends fields representing counts of each unique value from a raster layer contained within polygon features.

The output layer attribute table will have as many fields as the unique values of the raster layer that intersects the polygon(s).

../../../../_images/raster_histogram.png

Fig. 24.15 Raster layer histogram example

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Camada raster

INPUT_RASTER

[raster]

Input raster layer.

Band number

RASTER_BAND

[raster band]

Default: The first band of the input layer

If the raster is multiband, choose a band.

Vector layer containing zones

INPUT_VECTOR

[vector: polygon]

Vector polygon layer that defines the zones.

Output column prefix

COLUMN_PREFIX

Opcional

[string]

Default: ‘HISTO_’

Prefix for the output columns names.

Output zones

SAÍDA

[vector: polygon]

Default: [Create temporary layer]

Specify the output vector polygon layer. One of:

  • Create Temporary Layer (TEMPORARY_OUTPUT)

  • Salvar para Arquivo…

  • Salvar para Geopackage…

  • Save to Database Table…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Output zones

Opcional

SAÍDA

[vector: polygon]

Default: [Create temporary layer]

The output vector polygon layer.

Python code

Algorithm ID: qgis:zonalhistogram

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 do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.9.26. Zonal statistics

Calculates statistics of a raster layer for each feature of an overlapping polygon vector layer.

Prior to QGIS 3.16, the algorithm edited the layer in-place, adding the new statistics fields to it. Now, it outputs a new layer with these statistics.

Parâmetros

Etiqueta

Nome

Tipo

Descrição

Camada de entrada

ENTRADA

[vector: polygon]

Vector polygon layer that contains the zones.

Camada raster

INPUT_RASTER

[raster]

Input raster layer.

Raster band

RASTER_BAND

[raster band]

Default: The first band of the input layer

If the raster is multiband, choose a band for the statistics.

Output column prefix

COLUMN_PREFIX

[string]

Default: ‘_’

Prefix for the output columns names.

Statistics to calculate

STATISTICS

[enumeration] [list]

Default: [0,1,2]

List of statistical operator for the output. Options:

  • 0 — Count

  • 1 — Sum

  • 2 — Mean

  • 3 — Median

  • 4 — St. dev.

  • 5 — Minimum

  • 6 — Maximum

  • 7 — Range

  • 8 — Minority

  • 9 — Majority

  • 10 — Variety

  • 11 — Variance

Zonal Statistics NEW in 3.16

SAÍDA

[vector: polygon]

Default: [Create temporary layer]

Specify the output vector polygon layer. One of:

  • Create Temporary Layer (TEMPORARY_OUTPUT)

  • Save to File…

  • Save to Geopackage…

  • Save to Database Table…

  • Append to Layer…

A codificação do arquivo também pode ser alterada aqui.

Saídas

Etiqueta

Nome

Tipo

Descrição

Zonal Statistics NEW in 3.16

SAÍDA

[vector: polygon]

The zone vector layer with added statistics.

Python code

Algorithm ID: qgis:zonalstatisticsfb

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 do Terminal Python. for details on how to run processing algorithms from the Python console.