Vector geoprocessing

Buffer vectors

Create buffers around the features of a vector layer.

Parameters

Label Name Type Description
Input layer INPUT [vector: any] The input vector layer
Geometry column name GEOMETRY

[string]

Default: ‘geometry’

The name of the input layer geometry column to use
Buffer distance DISTANCE

[number]

Default: 10.0

Minimum: 0.0

Dissolve by attribute

Optional

FIELD

[tablefield: any]

Default: None

Field to use for dissolving
Dissolve results DISSOLVE

[boolean]

Default: False

If set, the result is dissolved. If no field is set for dissolving, all the buffers are dissolved into one feature.
Produce one feature for each geometry in any kind of geometry collection in the source file EXPLODE_COLLECTIONS

[boolean]

Default: False

 

Additional creation options

(optional)

OPTIONS

[string]

Default: ‘’ (no additional options)

Additional GDAL creation options.
Buffer OUTPUT

[vector: polygon]

Default: [Save to temporary file]

Specify the output buffer layer. One of:

  • Save to a Temporary File
  • Save to File…

The file encoding can also be changed here.

Outputs

Label Name Type Description
Buffer OUTPUT [vector: polygon] The output buffer layer

Clip vector by extent

Clips any OGR-supported vector file to a given extent.

This algorithm is derived from the ogr2ogr utility .

Parameters

Label Name Type Description
Input layer INPUT [vector: any] The input vector layer
Clip extent EXTENT [extent] Defines the bounding box that should be used for the output vector file. It has to be defined in target CRS coordinates.

Additional creation options

(optional)

OPTIONS

[string]

Default: ‘’ (no additional options)

Additional GDAL creation options.
Clipped (extent) OUTPUT

[same as input]

Default: [Save to temporary file]

Specify the output (clipped) 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 [same as input] The output (clipped) layer. The default format is “ESRI Shapefile”.

Clip vector by mask layer

Clips any OGR-supported vector layer by a mask polygon layer.

This algorithm is derived from the ogr2ogr utility .

Parameters

Label Name Type Description
Input layer INPUT [vector: any] The input vector layer
Mask layer MASK [vector: polygon] Layer to be used as clipping extent for the input vector layer.

Additional creation options

(optional)

OPTIONS

[string]

Default: ‘’ (no additional options)

Additional GDAL creation options.
Clipped (mask) OUTPUT

[same as input]

Default: [Save to temporary file]

The output (masked) 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 (mask) OUTPUT [same as input] The output (masked) layer. The default format is “ESRI Shapefile”.

Dissolve

Dissolve (combine) geometries that have the same value for a given attribute / field. The output geometries are multipart.

Parameters

Label Name Type Description
Input layer INPUT [vector: any] The input layer to dissolve

Dissolve field

(optional)

FIELD [tablefield: any] The field of the input layer to use for dissolving
Geometry column name GEOMETRY

[string]

Default: ‘geometry’

The name of the input layer geometry column to use for dissolving.
Produce one feature for each geometry in any kind of geometry collection in the source file EXPLODE_COLLECTIONS

[boolean]

Default: False

Produce one feature for each geometry in any kind of geometry collection in the source file
Keep input attributes KEEP_ATTRIBUTES

[boolean]

Default: False

Keep all attributes from the input layer
Count dissolved features COUNT_FEATURES

[boolean]

Default: False

Count the dissolved features and include it in the output layer.
Compute area and perimeter of dissolved features COMPUTE_AREA

[boolean]

Default: False

Compute the area and perimeter of dissolved features and include them in the output layer
Compute min/max/sum/mean for attribute COMPUTE_STATISTICS

[boolean]

Default: False

Calculate statistics (min, max, sum and mean) for the numeric attribute specified and include them in the output layer

Numeric attribute to calculate statistics on

(optional)

STATISTICS_ATTRIBUTE [tablefield: numeric] The numeric attribute to calculate statistics on

Additional creation options

(optional)

OPTIONS

[string]

Default: ‘’ (no additional options)

Additional GDAL creation options.
Dissolved OUTPUT

[same as input]

Default: [Save to temporary file]

Specify the output layer. One of:

  • Save to a Temporary File
  • Save to File…

The file encoding can also be changed here.

Outputs

Label Name Type Description
Dissolved OUTPUT [same as input] The output multipart geometry layer (with dissolved geometries)

Offset curve

Offsets lines by a specified distance. Positive distances will offset lines to the left, and negative distances will offset them to the right.

Parameters

Label Name Type Description
Input layer INPUT [vector: line] The input line layer
Geometry column name GEOMETRY

[string]

Default: ‘geometry’

The name of the input layer geometry column to use
Offset distance (left-sided: positive, right-sided: negative) DISTANCE

[number]

Default: 10.0

 

Additional creation options

(optional)

OPTIONS

[string]

Default: ‘’ (no additional options)

Additional GDAL creation options.
Offset curve OUTPUT

[vector: line]

Default: [Save to temporary file]

Specify the output line layer. One of:

  • Save to a Temporary File
  • Save to File…

The file encoding can also be changed here.

Outputs

Label Name Type Description
Offset curve OUTPUT [vector: line] The output offset curve layer

One side buffer

Creates a buffer on one side (right or left) of the lines in a line vector layer.

Parameters

Label Name Type Description
Input layer INPUT [vector: line] The input line layer
Geometry column name GEOMETRY

[string]

Default: ‘geometry’

The name of the input layer geometry column to use
Buffer distance DISTANCE

[number]

Default: 10.0

 
Buffer side BUFFER_SIDE

[enumeration]

Default: 0

One of:

  • 0 — Right
  • 1 — Left

Dissolve by attribute

Optional

FIELD

[tablefield: any]

Default: None

Field to use for dissolving
Dissolve all results DISSOLVE

[boolean]

Default: False

If set, the result is dissolved. If no field is set for dissolving, all the buffers are dissolved into one feature.
Produce one feature for each geometry in any kind of geometry collection in the source file EXPLODE_COLLECTIONS

[boolean]

Default: False

 

Additional creation options

(optional)

OPTIONS

[string]

Default: ‘’ (no additional options)

Additional GDAL creation options.
One-sided buffer OUTPUT

[vector: polygon]

Default: [Save to temporary file]

Specify the output buffer layer. One of:

  • Save to a Temporary File
  • Save to File…

The file encoding can also be changed here.

Outputs

Label Name Type Description
One-sided buffer OUTPUT [vector: polygon] The output buffer layer

Points along lines

Generates a point on each line of a line vector layer at a distance from start. The distance is provided as a fraction of the line length.

Parameters

Label Name Type Description
Input layer INPUT [vector: line] The input line layer
Geometry column name GEOMETRY

[string]

Default: ‘geometry’

The name of the input layer geometry column to use
Distance from line start represented as a fraction of line length DISTANCE

[number]

Default: 0.5 (middle of the line)

 

Additional creation options

(optional)

OPTIONS

[string]

Default: ‘’ (no additional options)

Additional GDAL creation options.
Points along line OUTPUT

[vector: point]

Default: [Save to temporary file]

Specify the output point layer. One of:

  • Save to a Temporary File
  • Save to File…

The file encoding can also be changed here.

Outputs

Label Name Type Description
Points along line OUTPUT [vector: point] The output point layer