Conversão de raster

gdal2xyz

Converte dados raster em formato de arquivo ASCII XYZ

Parâmetros

Label	Nome	Type	Descrição
Input layer	INPUT	[raster]	Raster layer to convert
Band number	BAND	[raster band] Default: The first band of the input layer	If the raster is multiband, choose the band you want to convert
Output comma-separated values	CSV	[boolean] Default: False	Sets whether the output file should be of type comma-separated values (csv).
XYZ ASCII file	OUTPUT	[file] Default: [Save to temporary file]	Specification of the output file. One of: Save to a Temporary File Save to File… The file encoding can also be changed here.

Saídas

Label	Nome	Type	Descrição
XYZ ASCII file	INPUT	[table]	Arquivo de tabela que contém os valores exportados da banda raster

PCT para RGB

Converts an 8 bit paletted image to a 24 bit RGB. It will convert a pseudocolor band from the input file to an RGB file of the desired format.

This algorithm is derived from the GDAL pct2rgb utility .

“Menu padrão”: seleção menu: ‘Raster –> conversão’

Parâmetros

Label	Nome	Type	Descrição
Input layer	INPUT	[raster]	Input 8 bit raster image
Band number	BAND	[raster band] Default: The first band of the input layer	If the raster is multiband, choose the band you want to convert
Generate a RGBA file	RGBA	[boolean] Default: False	Sets whether the output file should be of type RGBA.
PCT to RGB	OUTPUT	[file] Default: [Save to temporary file]	Specification of the output file. One of: Save to a Temporary File Save to File… The file encoding can also be changed here.

Saídas

Label	Nome	Type	Descrição
PCT to RGB	OUTPUT	[raster]	24 bit RGB raster image

Poligonizar (raster para vetor)

Cria polígonos vetoriais para todas as regiões conectadas de pixels no raster que compartilha um valor de pixel comum. Cada polígono é criado com um atributo que indica o valor de pixel desse polígono.

This algorithm is derived from the GDAL polygonize utility .

“Menu padrão”: seleção menu: ‘Raster –> conversão’

Parâmetros

Label	Nome	Type	Descrição
Input layer	INPUT	[raster]	Input raster layer
Band number	BAND	[raster band] Default: The first band of the input layer	If the raster is multiband, choose the band you want to use
Name of the field to create	FIELD	[string] Default: ‘DN’	Specify the field name for the attributes of the connected regions.
Use 8-connectedness	EIGHT_CONNECTEDNESS	[boolean] Default: False	If not set, raster cells must have a common border to be considered connected (4-connected). If set, touching raster cells are also considered connected (8-connected).
Vectorized	OUTPUT	[vector: polygon] Default: [Save to temporary file]	Specification of the output (polygon) vector layer. One of: Save to a Temporary File Save to File… The file encoding can also be changed here.

Saídas

Label	Nome	Type	Descrição
Vectorized	OUTPUT	[vector: polygon]	Output vector layer

Reorganizar bandas

Cria um novo raster usando banda (s) selecionada de uma determinada camada raster. O algoritmo também torna possível reordenar as bandas para o raster recém-criado.

This algorithm is derived from the GDAL translate utility .

Parâmetros

Label	Nome	Type	Descrição
Input layer	INPUT	[raster]	Input raster layer
Selected band(s)	BANDS	[raster band] [list] Default: None	Ordered list of the bands to use to create the new raster
Additional creation options Opcional.	OPTIONS	[string] 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).
Output data type	DATA_TYPE	[enumeration] Default: 0	Defines the data type of the output raster file. Options: 0 — Use Input Layer Data Type 1 — Byte 2 — Int16 3 — UInt16 4 — UInt32 5 — Int32 6 — Float32 7 — Float64 8 — CInt16 9 — CInt32 10 — CFloat32 11 — CFloat64
Converted	OUTPUT	[raster] Default: Save to temporary file	Specification of the output raster. One of: Save to a Temporary File Save to File… The file encoding can also be changed here.

Saídas

Label	Nome	Type	Descrição
Converted	OUTPUT	[raster]	Output raster layer with rearranged bands.

RGB to PCT

Converts a 24 bit RGB image into a 8 bit paletted. Computes an optimal pseudo-color table for the given RGB-image using a median cut algorithm on a downsampled RGB histogram. Then it converts the image into a pseudo-colored image using the color table. This conversion utilizes Floyd-Steinberg dithering (error diffusion) to maximize output image visual quality.

Se você quiser classificar um mapa raster e quiser reduzir o número de classes que pode ser útil para downsample sua imagem com este algoritmo antes.

This algorithm is derived from the GDAL rgb2pct utility .

“Menu padrão”: seleção menu: ‘Raster –> conversão’

Parâmetros

Label	Nome	Type	Descrição
Input layer	INPUT	[raster]	Input (RGB) raster layer
Number of colors	NCOLORS	[number] Default: 2	O número de cores que a imagem resultante conterá. Um valor de 2-256 é possível.
RGB to PCT	OUTPUT	[raster] Default: [Save to temporary file]	Specification of the output raster. One of: Save to a Temporary File Save to File… The file encoding can also be changed here.

Saídas

Label	Nome	Type	Descrição
RGB to PCT	OUTPUT	[raster]	Output raster layer.

Translate (convert format)

Converts raster data between different formats.

This algorithm is derived from the GDAL translate utility .

“Menu padrão”: seleção menu: ‘Raster –> conversão’

Parâmetros

Label	Nome	Type	Descrição
Input layer	INPUT	[raster]	Input raster layer
Override the projection of the output file Opcional.	TARGET_CRS	[crs]	Specify a projection for the output file
Assign a specified nodata value to output bands Opcional.	NODATA	[number] Default: Not set	Defines the value to use for nodata in the output raster
Copy all subdatasets of this file to individual output files	COPY_SUBDATASETS	[boolean] Default: False	Create individual files for subdatasets
Additional creation options Opcional.	OPTIONS	[string] 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).
Output data type	DATA_TYPE	[enumeration] Default: 0	Defines the data type of the output raster file. Options: 0 — Use Input Layer Data Type 1 — Byte 2 — Int16 3 — UInt16 4 — UInt32 5 — Int32 6 — Float32 7 — Float64 8 — CInt16 9 — CInt32 10 — CFloat32 11 — CFloat64
Converted	OUTPUT	[raster] Default: [Save to temporary file]	Specification of the output (translated) raster layer. One of: Save to a Temporary File Save to File… The file encoding can also be changed here.

Saídas

Label	Nome	Type	Descrição
Converted	OUTPUT	[raster]	Output (translated) raster layer.