Raster conversion

gdal2xyz

Converts raster data to XYZ ASCII file format.

Parameters

Label Name Type Description
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.

Outputs

Label Name Type Description
XYZ ASCII file INPUT [table] Table file containing the values exported from the raster band.

PCT to 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 .

Default menu: Raster ‣ Conversion

Parameters

Label Name Type Description
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.

Outputs

Label Name Type Description
PCT to RGB OUTPUT [raster] 24 bit RGB raster image

Polygonize (raster to vector)

Creates vector polygons for all connected regions of pixels in the raster sharing a common pixel value. Each polygon is created with an attribute indicating the pixel value of that polygon.

This algorithm is derived from the GDAL polygonize utility .

Default menu: Raster ‣ Conversion

Parameters

Label Name Type Description
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).

Additional command-line parameters

Optional

EXTRA

[string]

Default: None

Add extra GDAL command line options
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.

Outputs

Label Name Type Description
Vectorized OUTPUT [vector: polygon] Output vector layer

Rearrange bands

Creates a new raster using selected band(s) from a given raster layer. The algorithm also makes it possible to reorder the bands for the newly-created raster.

This algorithm is derived from the GDAL translate utility .

Parameters

Label Name Type Description
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

Optional

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.

Outputs

Label Name Type Description
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.

If you want to classify a raster map and want to reduce the number of classes it can be helpful to downsample your image with this algorithm before.

This algorithm is derived from the GDAL rgb2pct utility .

Default menu: Raster ‣ Conversion

Parameters

Label Name Type Description
Input layer INPUT [raster] Input (RGB) raster layer
Number of colors NCOLORS

[number]

Default: 2

The number of colors the resulting image will contain. A value from 2-256 is possible.
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.

Outputs

Label Name Type Description
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 .

Default menu: Raster ‣ Conversion

Parameters

Label Name Type Description
Input layer INPUT [raster] Input raster layer

Override the projection of the output file

Optional

TARGET_CRS [crs] Specify a projection for the output file

Assign a specified nodata value to output bands

Optional

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

Optional

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).

Additional command-line parameters

Optional

EXTRA

[string]

Default: None

Add extra GDAL command line options
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.

Outputs

Label Name Type Description
Converted OUTPUT [raster] Output (translated) raster layer.