Raster extraction

Clip raster by extent

Clips any GDAL-supported raster file to a given extent.

This algorithm is derived from the GDAL grid utility .

Default menu: Raster ‣ Extraction

Parameters

Label Name Type Description
Input layer INPUT [raster] The input raster
Clipping extent EXTENT [extent] Extent that should be used for the output raster. Only pixels within the specified bounding box will be included in the output.

Assign a specified nodata value to output bands

Optional

NODATA

[number]

Default: None

Defines a value that should be inserted for the nodata values in the output 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 format 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

Additional command-line parameters

Optional

EXTRA

[string]

Default: None

Add extra GDAL command line options
Clipped (extent) OUTPUT

[raster]

Default: ‘[Save to temporary file]’

Specification of the output 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
Clipped (extent) OUTPUT [raster] Output raster layer clipped by the given extent

Clip raster by mask layer

Clips any GDAL-supported raster by a vector mask layer.

This algorithm is derived from the GDAL grid utility .

Default menu: Raster ‣ Extraction

Parameters

Label Name Type Description
Input layer INPUT [raster] The input raster
Mask layer EXTENT [vector: polygon] Vector mask for clipping the raster
Source CRS SOURCE_CRS [crs]  
Target CRS TARGET_CRS [crs]  

Assign a specified nodata value to output bands

Optional

NODATA

[number]

Default: None

Defines a value that should be inserted for the nodata values in the output raster
Create an output alpha band ALPHA_BAND

[boolean]

Default: False

Creates an alpha band for the result. The alpha band then includes the transparency values of the pixels.
Match the extent of the clipped raster to the extent of the mask layer CROP_TO_CUTLINE

[boolean]

Default: True

Applies the vector layer extent to the output raster if checked.
Keep resolution of input raster KEEP_RESOLUTION

[boolean]

Default: False

The resolution of the output raster will not be changed

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 format 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

Outputs

Label Name Type Description
Clipped (mask) OUTPUT [raster] Output raster layer clipped by the vector layer

Contour

Extracts contour lines from any GDAL-supported elevation raster.

This algorithm is derived from the GDAL contour utility .

Default menu: Raster ‣ Extraction

Parameters

Label Name Type Description
Input layer INPUT [raster] Input raster
Band number BAND [raster band] Raster band to create the contours from
Interval between contour lines INTERVAL

[number]

Default: 10.0

Defines the interval between the contour lines in the given units of the elevation raster (minimum value 0)

Attribute name (if not set, no elevation attribute is attached)

Optional

FIELD_NAME

[string]

Default: ‘ELEV’

Defines the attribute name for the field containing the values of the contour lines.
Produce 3D vector CREATE_3D

[boolean]

Default: False

Forces production of 3D vectors instead of 2D. Includes elevation at every vertex.
Treat all raster values as valid IGNORE_NODATA

[boolean]

Default: False

Ignores any nodata values in the dataset.

Input pixel value to treat as “nodata”

Optional

NODATA

[number]

Default: None

Defines a value that should be inserted for the nodata values in the output raster

Offset from zero relative to which to interpret intervals

Optional

OFFSET

[number]

Default: 0.0

 

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).
Contours OUTPUT

[vector: line]

Default: ‘[Save to temporary file]’

Specification of the output 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
Contours OUTPUT [vector: line] Output vector layer with contour lines